whats a 3/4 race cam???

[grumpyvette]

"
A buddy told me to get a 3/4 cam. Ive heard people use that description before, but what the heck is does it mean?

example

http://www.speedwaymotors.com/1949-53-F ... M,422.html


http://www.jegs.com/i/Crane/270/100172/10002/-1#
"

MANY ......MANY years ago cams for the flat head fords, 406 fords, 292-312 fords,tri-power olds, nail head buicks,348-409 chevys etc, that were the hotter engines back in the late 50s-60s were sold as 1/2 race or 3/4 race or FULL RACE cams, mostly in catalogs from places like JC whitney, or the old speed shops

ITS basically a nearly meaningless marketing term from the 50s-late 60s

heres a good example of what a 3/4 race SBC crane cam was

REMEMBER back in the early days like the 1950-60 time frame most guys were clueless about cam specs, and if they wanted more performance many just went to the local chevy parts counter and asked for a cam that produced more power, few guys understood how lift and duration and LSA changes effected the cams power range!
and most guys ran the hotter factory supplied optional cams, like the dontov 30/30 or the (FUELIE 365 hp cam) in their sbc, or similar factory performance over the counter cams in there cars, only a few cam company's were well known, isky, crane, crower.
it was rather common to order cams from the back page of a hot rod magazine

1/2 race generally burbled at idle and had some improved hp, generally in the 210 dur range on a wide lsa

3/4 race loped at idle and was generally in the 220-225 dur range on a tight lsa

full race loped at idle, had good hp and generally fell in the 235-245 dur range

they figured if you needed more than that you were supposed to know enought to work with a cam company, on your combos needs

today you fill out a question sheet or use software to select the correct cam.


this might keep you from making a HUGE mistake, it gets you into the correct ball park on dur. and lift most of the time, once you know that info you can use the info to select any brand cam

http://www.compcams.com/CAMQUEST/

 

[joegagan]

what about the term 'RV cam' same kind of hype, maybe 20 years after the 1/2 race, 3/4, etc.

 

[grumpyvette]

RV cams are designed for low rpm torque and mileage, generally built on about a 195-200 duration and a .450 lift in a sbc

CAM SENSE
CAM TYPES EXPLAINED IN PLAIN ENGLISH

The RV camshaft was originated by Erson Cams in 1972. Originally designed for use in heavy vehicle and towing applications, these camshafts have proven to be the perfect answer for late model, low compression engines, and are now used primarily in passenger cars, station wagons and light utility vehicles.
RV Cams are suitable for use in otherwise stock low compression engines. Usable power is increased between 1500 and 5000 (depending on application). These camshafts have a smooth idle, excellent throttle response and acceleration, plus good fuel efficiency. For the best possible performance, the engine should be equipped with headers, a free-flow exhaust system, a small 4-barrel carburetor and a re-curved ignition system.

These camshafts are ideal for sedans, station wagons, pick-ups, vans and motor homes. Suitable for over-the-road driving, trailer towing, etc. Idle is smooth and standard gearing is satisfactory.

RV Cams are available for all late model American passenger car and light truck engines in hydraulic or mechanical designs.

 

[grumpyvette]

looking for a decent cam?
youll need a bit more info to make the correcty choice than,
the comon, " I want a lopey idle and more horsepower"

you NEED to take ALOT more info into the sellection process.
step one

list everything you know and call 5-7 cam companies
heres a semi-fool proof method
but you really need to know your coil bind height, compression ratio, rear gear ratio, type of transmission,etc.

sellecting the correct cam for YOUR combo
YOU need more info than the comon
I want a LUMPY IDLE SOUND and a FASTER CAR, whats the best cam..." you can start with this

FREE software


http://www.compcams.com/Camquest/default.asp


look you may not want too hear this but...IF YOU FOLLOW the advice BELOW EXACTLY, youll have a decent cam, ignore it and your very likely to find youve sellected a cam that won,t run correctly in YOUR APPLICATION

heres a semi-fool proof method


write a list of all factors that will influence the choice DON,T LIE tell them EXACTLY what you expect and what you have currently ,installed that the cam must work with NOW, NOT what you intend to install later
YES you NEED too KNOW your COMPRESSION RATIO, and all the other answers to the questions below BEFORE calling....
car weigh?
rear gear ratio?
tire dia.
trans and gear ratios?
stall speed if its an auto?
displacement?
COMPRESSION RATIO
HEADS (flow numbers)(lift restrictions)
intake type
tire size
intended use
max rpms
launch rpms
MIMIMUM IDLE
fuel octane
carbs,mpfi? CFM
ETC.

call a minimum of 5 major cam companys, (6-8 is better)
write down thier recommended cam type,its lift, and duration at .050 and LCA.

read off the list to each manufactures tech guys, but DON,T DISCUSS IN ANY WAY WHAT OTHER MANUFACTURERS SUGGESTED

AVERAGE THE RESULTING LIFT DURRATION and LCA info from each cam, and buy the cam thats CLOSEST TOO THAT AVERAGE, (ALL the MAJOR MANUFACTURERS HAVE DECENT CAMS) this tends to give consistantly good results

MORE INFO

viewtopic.php?f=52&t=399

viewtopic.php?f=52&t=155

viewtopic.php?f=52&t=553

http://www.aa1car.com/library/camshafts.htm

http://www.compcams.com/Technical/FAQ/C ... stions.asp

http://www.camcraft-cams.com/index.php? ... ting-a-cam

http://www.chevyhiperformance.com/techa ... index.html


http://www.cranecams.com/?show=faq&id=2

keep in mind solid lifters generally have an rpm advantage and roller cams generally out perform flat tappet designs but cost more

http://www.crower.com/

http://www.cranecams.com/

http://pbmperformance.com/store.php?catId=327

http://www.holley.com/index.asp?division=Lunati

http://www.chetherbert.com/newchet.html

http://www.howardscams.com/index-2.html

http://www.iskycams.com/

http://www.reedcams.com/

http://www.schneidercams.com/cams/20.htm

http://www.lazercams.com/CamTables.html

http://www.englecams.com/

NO! ONE SIZE LARGER WON,T GENERALLY WORK BETTER, IN FACT ITS FAR MORE LIKELY TO BE A HUGE P.I.T.A to DRIVE AND HURT PERFORMANCE thumbsup:
its critical that the converter stall speed and rear gear ratio match the cam timing and compression ratio if its an AUTO TRANSMISSION,......
MORE than if you have a manual trans, which is far more flexiable as to what it will function with.
but having the rear gear ratio and compression ratio match the cam is mandatory for good results
and the larger the displacement and the better the heads flow the more likely it is that youll find both good low rpm tq and mid to upper rpm hp youll want in a street/strip combo, Ive seen many bad combos put together due to sellecting a cam based on, the flawed logic
(well my buddies running cam (X) his car runs good...and I want to beat him so ILL buy the NEXT more aggessive cam with just a bit more durration and outrun him)
in most cases youll be far better off, researching and sellecting a combo with better cylinder heads, intake flow rates and larger displacement, rather than trying to go with a wilder cam.
remember your rarely going to make a huge improvement in hp per cubic inch with cam upgrades once youve reached about 1.25 hp per cubic inch displacement, but increasing the displacement, compression ratio and DISPLACEMENT tends to give a good boost over similar combos with lower displacement/cpr and head flow rates
if a 350 with 9.5:1 cpr that makes 1.25 hp per cubic inch thats 437 hp
build a similar stroker combo that has 401 cubic inchs and 10.5:1 cpr and your far more likely to have about 520hp based on similar components
(the same 1.25 hp per cubic inch plus .04 increased tq due to the higher cpr and increased stroke ) plus all that at a slightly LOWER rpm thats easier on the valve train stress.
you might want to remember that a restrictive exhaust will kill much of the power potential, so decent TUNNED headers and a low restiction exhaust is a necessary part of any build, and unless you can maintain the correct fuel/air ratio you can,t make good hp, so matching the fuel delivery and injector size to the applications mandatory

 

[Grumpy]

http://www.kendrick-auto.com/chevrolet_ ... m_spec.htm
Chevrolet Factory Cam Specs
Chevrolet Factory Cam Specs by part number
Part # Lifter type–duration at .050 In/ex–Lift in/ex–centerline–description
Small Blocks
3849346 Mechanical – 254/254 – .484/.484 – 114 – 327 365HP& Z-28 302
3863151 Hyd. – 221/221-.447/.447-114 – 327-350HP, L79
3896929 Hyd. – 195/202 – .390/.410 – 112 – 327 300 HP
3896962 Hyd. – 222/222 – .450/.460 – 114 – 350 L-46, L-82
3927140 Mechanical – 257/269 – .493/.512 – 112 – Off Road
3965724 Mechanical – 262/273 – .488/.509 – 112 – 2nd design road race, short track
3972178 ?
3972182 Mechanical – 242/254 – .459/.485 – 116 – 70 LT1 360 & 370HP, 71 LT 330 HP
10134334 Hyd. Roller – 235/235 – .480/.480 – 114 – 350ZZZ and ZZ2 Crate Motor
10185071 Hyd. Roller – 208/221 – .474/.474 – 112 – 350 345, ZZ3&4 Crate Motor
10224241 Hyd. Roller – – 92-94 GenII, LT1, 350
10243779 Hyd. Roller – – 94-96 Gen II, L99 265 V-8
12353914 Hyd. – 180/194 – .378/.401 – – GM Crane Lo speed Hi torque
12353915 Hyd. – 194/204 – .401/.423 – 104 – GM Crane street
12353916 Hyd. – 204/214 – .423/.446 – 110 – GM Crane 305-350 street legal 50 states
12353917 Hyd. – 204/214 – .420/.441 – 112 – GM Crane nan-emissions vehicles & off road
12353918 Hyd. – 214/224 – .442/.465 – 112 – GM Crane marine & off road
12353923 Hyd. – 224/234 – .465/.448 – 114 – GM Crane off road
12364050 ?
12364051 ?
12364052 ?
12364053 ?
12364054 ?
12370845 Hyd. Roller – 214/224 – .488/.509 – 112 – Off Road, lobe for mech fuel pump
12370846 Hyd. Roller – 222/230 – .509/.528 – 112 – Off Road, lobe for mech fuel pump
12370847 Hyd. Roller – 232/242 – .539/.558 – 112 – Off Road, lobe for mech fuel pump
12551142 Hyd. Roller – 203/210 – .476/.480 – 115.5 – 96 350 LT4 w1.6 roller rockers
12551705 Hyd. Roller – 201/208 – .447/.459 – 112 – 95-96 Gen II, LT1, w center dowel pin
14088843 Hyd. – 202/206 – .403/.415 – 115 – 305 HO, 83-86
14093643 Hyd. Roller – 202/206 – .403/.415 – 115 – 87 350 Corvette, IROC Camaro
24502476 Hyd. – 121/220 – .435/.460 – 112.5 – 350 300 crate motor
24502586 Hyd. Roller – 218/228 – .525/.525 – – 96 LT4 H.O.T. crate motor, use with 1.6 roller rockers
NA Hyd. Roller – 202/210 – .472/.478 – 111 – 97 Gen III LS1 Corvette 350 uses 1.7 roller rockers

http://www.nastyz28.com/sbchevy/sbccams.html

Part Number Type DUR @ .050" Lift C/R LSA Usage
14093643 Hyd. Roller 202/206 .403"/.415" 8.5:1 115 '87 350 Corvette and IROC Camaro
10134334 Hyd. Roller 235/235 .480"/.480" 9.0:1 114 350 ZZZ through ZZ2 crate motors
10185071 Hyd. Roller 208/221 .474"/.474" 9.8:1 112 350/345 ZZ3 & ZZ4 crate motor
10224241 Hyd. Roller - - - - '92 to'94 Gen. 11 LT1 350
10243779 Hyd. Roller - - - - '94 to '96 Gen. II L99 265 V-8
12370845 Hyd. Roller 214/224 .488"/.509" - 112 Off-road use, lobe for mech. fuel pump
12370846 Hyd. Roller 222/230 .509"/.528" - 112 Off-road use, lobe for mech. fuel pump
12370847 Hyd. Roller 232/242 .539"/.558" - 112 Off-road use, lobe for mech. fuel pump
125517051 Hyd. Roller 201/208 .447"/.459" 10.4:1 112 '95 to '96 Gen. 11 LT1 350, w/center dowel pin
12551142 Hyd. Roller 203/210 .476"/.480" 10.8:1 115.5 '96 350 LT4 w/1.6:1 roller rockers
24502586 Hyd. Roller 218/228 .525"/.525" 10.8:1 - '96 LT4 H.O.T crate motor cam, use
- - - - - - w/1.6:1 roller rockers.
N/A Hyd. Roller 202/210 .472"/.478" 10.0:1 11 '97 Gen. III LS1 Corvette 350, uses 1.7
- - - - - - roller rockers and Gen. III
- - - - - - tapered valve spring
24502476 Hyd. 212/220 .435"/.460" 9.1:1 112.5 350/300 CC crate motor
14088843 Hyd. 202/206 .403"/.415" 8.5:1 115 '83 to'86 305HO
12364050
3863151 Hyd. 221/221 .447"/.447" 11.0:1 114 327/350HP L-79
12364051
3896929 Hyd. 195/202 .390"/.410" 8.0:1 112 327/300HP
3896962 Hyd. 222/222 .450"/.460" 8.5:1 114 350 L-46, L-82
12353915 Hyd. 194/204 .401"/.423" 8.0:1 104 GM/Crane street
12353914 Hyd. 180/194 .378"/.401" 8.0:1 - GM/Crane very high, low-speed torque
12353923 Hyd. 224/234 .465"/.448" 9.5:1 114 GM/Crane off-road
12353918 Hyd. 214/224 .442"/.465" 8.75:1 112 GM/Crane marine & off-road
12353917 Hyd. 204/214 .420"/.442" 9.0:1 112 GM/Crane non-emissions vehicles & off-road
12353916 Hyd. 204/214 .423"/.446" 8.5:1 110 GM/Crane 50 state legal 305-350
12364052
3849346 Mech. 254/254 .485"/.485" 11.0:1 114 327/365HP & Z-28 302
12364053
3927140 Mech. 257/269 .493"/.512" 12.0:1 112 Off-road
12364054
3972178
3972182 Mech. 242/254 .459"/.485" 11.0:1 116 '70 LT1 360 to 370HP
" " " " 9.0:1 116 71 LT1 330HP
3965724 Mech. 262/273 .488"/.509" 12.5:1 112 2nd design, short track, road race
Key to table:
DUR = Duration, C/R = Compression ratio of engine used in (stock), LSA = Lobe Separation Angle.

http://www.gmpartsdirect.com/performanc ... D=485.html

Quick Reference Charts

Large Cat. Image
Modifier
10186060 Hydraulic Flat Tappet "454"
This hydraulic flat tappet "454" is a good street high-performance and marine cam used in the Gen V 454 H.O. engine P/N 10185058. (Advanced five degrees; use spring P/N 3970627.) The duration at lash point in degrees (intake/exhaust) is 328/324; duration at .050" tappet lift (intake/exhaust) is 220/220; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 500/500. Valve lash is zero/zero and lobe centerline is 115 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.
Modifier
12366543 Steel Roller
This steel roller is for 502/502 special engines. (Must use distributor gear P/N 10456413.) The duration at .050" tappet lift (intake/exhaust) is 224/234; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 527/544. Valve lash is zero/zero and lobe centerline is 110 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.
Modifier
14096209 Hydraulic Flat Tappet "502"
This hydraulic flat tappet "502" is a good street high-performance and marine cam used in the Gen V 502 H.O. engine P/N 10185085. (Use spring P/N 3970627.) The duration at lash point in degrees (intake/exhaust) is 328/324; duration at .050" tappet lift (intake/exhaust) is 220/220; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 500/500. Valve lash is zero/zero and lobe centerline is 115 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.
Modifier
24502611 Steel Roller
This steel roller is for the 502 and 454 H.O. engines. (Must use distributor gear P/N 10456413.) The duration at .050" tappet lift (intake/exhaust) is 211/230; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 510/540. Valve lash is zero/zero and lobe centerline is 112 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distribtor gear P/N 10456413 must be used on all crate engines with steel camshafts.
Modifier
3904362 Mechanical Flat Tappet
This mechanical flat tappet is an LS-6 street mechanical lifter cam. (Use spring P/N 3970627.) The duration at lash point in degrees (intake/exhaust) is 307/298; duration at .050" tappet lift (intake/exhaust) is 242/242; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 496/492. Valve lash is .024/.028 and lobe centerline is 114 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.
Modifier
3959180 Mechanical Flat Tappet
This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees. Small Image
Technical Notes: Distributor P/N 1104067 or melonized distribuor gear P/N 1045613 must be used on all crate engines with steel camshafts.

http://www.sallee-chevrolet.com/Camshafts/index.cfm

http://www.thirdgen.org/mods3
_________________

1973 Corvette 454 w/LS4 engine.
C.R. = 8.25:1
Horsepower = 275 @ 4400
Torque = 395 @ 2800
__________________________________________

I believe these are the correct camshaft specs, for a 1970 Chevrolet 454 w/LS5.
The duration figures, which are taken at .008-inch lift are 268° int./ 274° exh.
Camshaft number = #3883986
Camshaft Intake duration @ .050" == 214°
Camshaft Exhaust duration @ .050" = 218°
Camshaft lift - Intake == 0.461"
Camshaft lift - Exhaust = 0.480"
@ 115° LSA

1970 Chevrolet 454 w/LS5 engine.
C.R. = 10.25:1
Horsepower = 360 @ 5400
Torque = 500 @ 3200

1970 Chevrolet 402 w/L34 engine.
C.R. = 10.25:1
Horsepower = 350 @ 5200
Torque = 415 @ 3400
__________________________________________

I believe these are the correct camshaft specs, for a 1970 Chevrolet 454 w/LS6.
Camshaft number = #3863148
Camshaft Intake duration @ .050" == 242°
Camshaft Exhaust duration @ .050" = 242°
Camshaft lift - Intake == 0.520"
Camshaft lift - Exhaust = 0.520"
@ 114° LSA

1970 Chevrolet 454 w/LS6 engine.
C.R. = 11.25:1
Horsepower = 450 @ 5600
Torque = 500 @ 3600

1970 Chevrolet 402 w/L78 engine.
C.R. = 11.25:1
Horsepower = 375 @ 5600
Torque = 415 @ 3600
Chevrolet Factory Cam Specs by part number
Part # Lifter type--duration at .050 In/ex--Lift in/ex--centerline--description
Small Blocks
3849346 Mechanical - 254/254 - .484/.484 - 114 - 327 365HP& Z-28 302
3863151 Hyd. - 221/221-.447/.447-114 - 327-350HP, L79
3896929 Hyd. - 195/202 - .390/.410 - 112 - 327 300 HP
3896962 Hyd. - 222/222 - .450/.460 - 114 - 350 L-46, L-82
3927140 Mechanical - 257/269 - .493/.512 - 112 - Off Road
3965724 Mechanical - 262/273 - .488/.509 - 112 - 2nd design road race, short track
3972178 ?
3972182 Mechanical - 242/254 - .459/.485 - 116 - 70 LT1 360 & 370HP, 71 LT 330 HP
10134334 Hyd. Roller - 235/235 - .480/.480 - 114 - 350ZZZ and ZZ2 Crate Motor
10185071 Hyd. Roller - 208/221 - .474/.474 - 112 - 350 345, ZZ3&4 Crate Motor
10224241 Hyd. Roller - - 92-94 GenII, LT1, 350
10243779 Hyd. Roller - - 94-96 Gen II, L99 265 V-8
12353914 Hyd. - 180/194 - .378/.401 - - GM Crane Lo speed Hi torque
12353915 Hyd. - 194/204 - .401/.423 - 104 - GM Crane street
12353916 Hyd. - 204/214 - .423/.446 - 110 - GM Crane 305-350 street legal 50 states
12353917 Hyd. - 204/214 - .420/.441 - 112 - GM Crane nan-emissions vehicles & off road
12353918 Hyd. - 214/224 - .442/.465 - 112 - GM Crane marine & off road
12353923 Hyd. - 224/234 - .465/.448 - 114 - GM Crane off road
12364050 ?
12364051 ?
12364052 ?
12364053 ?
12364054 ?
12370845 Hyd. Roller - 214/224 - .488/.509 - 112 - Off Road, lobe for mech fuel pump
12370846 Hyd. Roller - 222/230 - .509/.528 - 112 - Off Road, lobe for mech fuel pump
12370847 Hyd. Roller - 232/242 - .539/.558 - 112 - Off Road, lobe for mech fuel pump
12551142 Hyd. Roller - 203/210 - .476/.480 - 115.5 - 96 350 LT4 w1.6 roller rockers
12551705 Hyd. Roller - 201/208 - .447/.459 - 112 - 95-96 Gen II, LT1, w center dowel pin
14088843 Hyd. - 202/206 - .403/.415 - 115 - 305 HO, 83-86
14093643 Hyd. Roller - 202/206 - .403/.415 - 115 - 87 350 Corvette, IROC Camaro
24502476 Hyd. - 121/220 - .435/.460 - 112.5 - 350 300 crate motor
24502586 Hyd. Roller - 218/228 - .525/.525 - - 96 LT4 H.O.T. crate motor, use with 1.6 roller rockers
NA Hyd. Roller - 202/210 - .472/.478 - 111 - 97 Gen III LS1 Corvette 350 uses 1.7 roller rockers

 

[Grumpy]

This is a list of near every replacement roller cam for small block chevys (factory roller).

Competition Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
08-300-8 206/210 .450/.480 .480/.512 112deg None
08-302-8 210/220 .480/.480 .512/.512 112deg None
08-304-8 210/220 .500/.510 .533/.544 112deg None
08-306-8 230/244 .510/.540 .544/.576 112deg None
Crane Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
104101 184/194 .384/.407 .410/.434 106deg None
104104 184/204 .384/.429 .410/.458 108deg None
104111 194/204 .407/.429 .434/.458 111deg None
104121 204/214 .429/.452 .458/.482 116deg None
104125 208/214 .438/.452 .467/.482 112deg None
104124 214/220 .452/.456 .482/.486 112deg None
JVR4 210/224 .516/.516 .551/.551 112deg None
10HR00022 206/214 .497/.497 .530/.530 112deg None
Lunati Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
50160 213/218 .446/.468 .476/.499 110deg None
50155 215/218 .489/.503 .521/.536 113deg None
50156 232/242 .510/.525 .544/.560 108deg None
50162 242/252 .525/.540 .560/.576 108deg None
SLP Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
51002 206/214 .470/.490 .501/.522 112deg None
51006 214/224 .470/.490 .501/.522 115deg 1992 Firehawk OE
51010 224/232 .490/.510 .522/.544 112deg None
Accel/Lingenfelter Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
74211 211/219 .503/.525 .536/.560 112deg None
74216 216/218 .462/.470 .493/.501 112deg None
74219 219/219 .525/.525 .560/.560 112deg None
TPIS Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
700-136 212/226 .483/.520 .515/.554 112deg ZZ9 Cam
700-137 210/218 .492/.492 .525/.525 112deg None
700-150 218/219 .415/.433 .443/.462 108deg Super Profile L98
GM High-Performance Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
10134334 235/235 .480/.480 .512/.512 114deg ZZ1 motor cam
10185071 208/221 .474/.510 .510/.544 112deg ZZ3 motor cam
24502586 218/228 .492/.492 .525/.525 112deg LT4 motor cam
GM Stock Cams
Model Number .05" Duration 1.5:1 Lift 1.6:1 Lift Lobe Sep. Notes
14093643 202/207 .404/.415 .431/.443 114.5 87 350,305man
10088155 179/194 .350/.384 .373/.410 109deg 87 305 auto
10066049 207/213 .415/.430 .443/.459 117deg 88-89 350,305
10111773 202/207 .413/.428 .441/.457 114.5 90-92 350,305
these suppliers Ive used and trust, Ive had far less than IDEAL results from other sources and some are BIG NAMES..Ive dealt with many cam companies over the years and most of them have decent quality cams, the main area in which they differ is tech support and their willingness to work with customers, and how knowledgeable the tech guys are, in my experience comps tech guys rate dead last, the product is reasonably good but the tech support desk can use major improvement


After youve installed several dozen cams from several manufacturers and frequently called tech support you get a feel for how a manufacturer treats customers and how well components fit, function and how they stand up over time,just over all results, Ive rarely had any issues with CRANE, CROWER, or ERSON parts or service, or tech support Ive had minor issues with LUNATI,ISKY ,tech support but not anything serious that was not eventually tracked down to either miss information on installation or errors in customer installs both easily avoided

there are other manufactures that seem to have a few hopelessly incompetent tech support people, with only a loose grasp on mechanics or engine assembly

read thru these threads
viewtopic.php?f=52&t=82&p=105&hilit=+fool#p105

viewtopic.php?f=52&t=155&p=189&hilit=+suppliers#p189

viewtopic.php?f=52&t=324

viewtopic.php?f=52&t=1070

viewtopic.php?f=52&t=480

viewtopic.php?f=52&t=181

suppliers
why not call
crane,1-866-388-5120
crower,1-619.661.6477
erson,1-800-641-7920
lunati 1-662-892-1500
isky 323.770.0930
clay smith 714-523-0530
http://www.crower.com/

http://pbmperformance.com/store.php?catId=327 (ERSON CAMS)

http://go.mrgasket.com/pdf/Chevrolet.pdf

http://www.cranecams.com/

http://schneidercams.com/

http://www.bulletcams.com/

http://www.claysmithcams.com

http://www.bulletcams.com/BulletCatalog.htm

https://shop.enginekits.com/osb/showite ... tegory=445 (ELGIN CAMS)

http://www.elliottsportworks.com/lt1.html

http://store.chetherbert.com/

http://www.dougherbert.com/

http://www.straubtechnologies.com/

http://www.pbm-erson.com/splash.php

http://www.iskycams.com/

http://www.lunaticams.com/

http://www.howardscams.com/index.php?op ... &Itemid=27

http://www.tpis.com/index.php?module=ca ... lic+Roller

http://www.cranecams.com.au/pdfs/bluera ... 4-5-07.pdf (BLUE RACER)

for those that don,t know you have options on the cams you order, that are not limited to the catalog options, alone, but be aware it can get rather expensive, and its not unusually for special order cams to take a month or two to arrive.
generally you can select what you need and its a listed option, yes you might want to change an existing cam, by ordering it on a tighter or wider LSA, occasionally you might want a longer intake duration lobe, matched to a shorter duration exhaust, on a custom LSA, like with a turbo application

CRANE
http://www.cranecams.com/uploads/lobe/masterlisting.pdf

CROWER
http://www.crower.com/index.php/master-catalog/

ISKY
http://www.iskycams.com/onlinecatalog.html

claysmith
http://www.claysmithcams.com/camshafts/

erson
http://usaperform.com/-c-154_206.html

engle cams
http://www.englecams.com/downloads/2010 ... atalog.pdf

elgin cams
http://catalog.elginind.com/app/engine_ ... by+Part+No.

herbert cams
http://www.herbertcams.com/herbert-cams-cam-kits/

howard
http://www.howardscams.com/howards2015.pdf

lunati
http://www.lunatipower.com/Performance-Cams.aspx

 

[Grumpy]

to get a TRUE muscle car era lope sound you need HIGH COMPRESSION , reasonably large displacement a free flow exhaust and a cam with a reasonably TIGHT LSA and duration in the 220-250 @ .050 RANGE MINIMUM

I have built a bunch of 383-406 SBC engines over the decades, I have a few brands Of cams I try to use and a few I avoid like the plague , due to past experiences dealing with the companys.
most were built and used in muscle cars and used as daily drivers so they got hydraulic roller cams like a CRANE 119661

or a CROWER 00471

these produce good power and instantly responsive torque curves which in a daily driven car is far more important than a few extra peak HP!


http://www.herbertcams.com/560-580-lift-250-255-dur-050-110-lobe-center/

theres some rather significant advantages in ordering a cam that closely matches the engines, requirements, and after building dozens of similar engines youll notice some trends and you may want to tweak the cam timing, this of course requires both a good understanding of what your trying to change or accomplish and what the changes you intend to make are likely to do to engine performance.
some companys make custom ordering rather easy like HERBERT CAMS

heres a cam thats rather well known for producing good power in a 10.7:1 compression 406 SBC combo.
(use mostly for racing in a light weight car like a cobra replica)
Ive built several times in the past, it really requires the following matched components
210-230cc port heads, 6" scat rods on a forged SCAT crank, a 3600-3800rpm stall converter, a 4.11:1-4.56:1 rear gear and an automatic trans that shifts at 6300rpm under full load race acceleration.
a good single plane intake like the edelbrock VIC series, an 850 cfm carb, long tube 1 3/4" headers 1.6:1 roller rockers and a rocker stud girdle

heres the came basic cam, but with a few mods that provide about 20 extra horse power, but at the cost of a noticeably rougher lope in the idle
notice the tighter LSA and its a 4/7 swap cam version on a smaller base circle