http://www.kendrick-auto.com/chevrolet_ ... m_spec.htm
If your ordering any cam, be very sure you explain what year block and what cylinder heads will be used as there are differences in the cams. between early and later SBC, block s and the cams they require,and on big blocks theres similar issues, a mark VI cam is different from a MARK IV cam
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
http://www.chevytech.com/2c40o8.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
If your ordering any cam, be very sure you explain what year block and what cylinder heads will be used as there are differences in the cams. between early and later SBC, block s and the cams they require,and on big blocks theres similar issues, a mark VI cam is different from a MARK IV cam
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
http://www.chevytech.com/2c40o8.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
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