489 BBC build

[grumpyvette]

thought you guys might like to see a 489-496 BBC dyno sheet posted on a differant forum
"Anyway for all asking, here is the short version

489,
Brodix Oval, p[ort heads
10.3, compression ratio
Ede Performer RPM, intake
Pro Systems HP 1000 w/ Dominator metering
LRE aluminum rockers,
Comp custom 242/.246 - 621/.615 hyd roller 114 LSA, 109 ICL,roller cam
91 pump, octane fuel
2" dyno headers

SHOP THAT BUILT IT

http://www.lewisracingengines.com/


differant BBC engine , but VERY CLEAN/IMPRESSIVE looking engine

 

[grumpyvette]

almost any 427 or 454 block can be used but the 4 bolt main GEN IV passenger block with the STANDARD 9.8" deck height in good condition will be a reasonable choice, the GEN V and GEN VI are not as MOD FRIENDLY (COST WISE)and theres a few parts interchange issues that while they can be worked around are best avoided, so the first choice is a 1967-1990 427-454 block from most cars or light trucks, motor homes ETC.

a correctly built 496 uses a 1/4 longer than stock 6.385 length rods with 7/16" bolts and larger counter weights to match the longer rods and higher pin height
you can,t use the stock crank or pistons to build a 496 stroker, yes theres kits available that allow the use of the stock 6.135" rods but they are significantly weaker than the aftermarket rods and require more clearancing on the crank/piston skirt area

http://www.rpmmachine.com/454-496-cast-chevy-stroker-bb.shtml

http://www.dougherbert.com/chevybbraceenginekit-p-25735.html

http://www.ohiocrank.com/chevy_rotating.html

http://www.adperformance.com/index.php?main_page=index&cPath=277_281

do yourself a huge favor and buy a matched stroker kit from a single source,
which includes an INTERNALLY BALLANCED COMBO OF
crank,rods,pistons,rings,bearings,damper,flexplate and a matching baffled high volume oil pan and oil pump with pick-up and sellect a combo that matches the heads youll use and allows the correct compression ratio for the cam, durration and rear gearing youll use

read

http://www.dougherbert.com/dhp496chevybbstroker600hp-p-25850.html

http://skunk.net/boats/boatengines-496.htm

 

[grumpyvette]

adding an ecomomically affordable 1/4" stroker kit to a 454 thats not going to be abused a great deal, as its mostly a street/strip deal is a NO BRAINER its FREE HP/TQ and I can,t see why almost every rebuild doesn,t do this as an option,
but because your running pump gas and adding displacement ID suggest boosting the cpr to about 9.6:1-10.2:1 and adding ARP main studs durring the rebuild and keeping the RPMs to UNDER 6000rpm with the stroker crank, in that two bolt block

heres a few basics for a hot street 496 bbc


http://www.adperformance.com/index.php? ... =67_87_131

http://store.survivalmotorsports.com/scat.html

btw a cam like this in a 10:1 cpr 496 with the correct matched drive train gearing and trans would be impressive on the street

http://store.survivalmotorsports.com/ca ... haust.html



$200 more than summit sells a cast crank assembly ,gets you a forged component deal


Eagle 4.25 "496" Competition Stroker Kit, 10:1, Forged, 2rms
$1,699.00
Eagle 4340 Forged Competition Rotating Assembly

Eagle 4340 Forged 4.250 Stroke Crankshaft
Eagle 4340 Forged 3D H-beam Rods (W/ ARP 8740 Bolts)
JE SRP 18cc Dome Piston (~10.2:1 w/ 118cc heads, others available)
Perfect Circle or Mahle Plasma Premium Performance Rings
Clevite or King Competition Series Rod and Main Bearings
We can fully customize these kits to your needs. If you don't see it listed please inquire.

Competition 454 Rotating Assemblies

2pc Rear Main Seal

All Eagle Competition assemblies include our forged 4340 chromoly crankshaft, our forged 4340 chromoly H-beam rods, forged SRP pistons, Clevite77 race bearings, and Perfect Circle Rings. All are designed for internal balance.

Recommended for use up to 850 HP (1500 HP with optional ARP L-19 bolts)

 

[grumpyvette]

worth reading thru

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


want to build a kick butt 489?

the last race 489 I built for a buddys camaro got him into the high 10s and hes not a skilled driver

we reused some existing components he had because of cost issues also


1969 camaro
manual trans (m21)
40 lb SFI flywheel
rebuilt HAYS 11" clutch with 3800lb springs
4.11:1 rear gears
4 bolt 454 block
chevy 3959180 cam (survival motor sports Chevrolet Performance Camshaft; Part Number SS4265 )
lifter-type Solid
Big Block 1967-93 396-454; intake-duration@.050 lift 264; exhaust-duration@.050 lift 274; intake-lift .612; exhaust-lift .637; lobe sep angle 108
$74.95

http://www.brodix.com/heads/raceritebb.html
brodix race rite rectangle heads

http://www.adperformance.com/index.php? ... cts_id=930

rotating assembly (12.5:1 true cpr) (YEAH RACE GAS REQUIRED)

2.1/8" full length headers

edelbrock air gap intake with a 950 cfm three barrel carb

vertex magneto, ignition

 

[grumpyvette]

prostreet69
POSTED THIS COMBO

Combo is as follows,
this thing made
692 HP and 649 TQ.
496 cu.in.
AFR 325 CNC chamber heads
AED 850 HO MOD carb{only adjusted 4 corner idle circuit no jet change}
Weiand Team-G ported
Lunati{old UD Harold grind} 256-264@.050, .660 lift solid roller 110 lobe separation. put in on 105 degrees.
Isky Red Zone lifters
Crower Enduro 1.7 stainless rockers
Eagle crank and H-beam rods
10.5-1 comp ratio
MSD 6-AL 2 ignition
Dyno'd with BP 93 octane pump gas
2 1/8" primary 3 1/2" collector home built headers.

this is a good example of what great heads and a cam thats been selected to maximize the heads flow will do for a 496-540 BBC

 

[grumpyvette]

having built several of both displacement , ID suggest the 482-489 bbc is probably the best route,(4.25 stroke with a standard or .030 over bore vs the .060 over bore 496 is the best option if your on a budget,as it retains more cylinder wall rigidity)

I just built one for a local guy , mostly from his old parts and a new rotating kit from scat

3310 holley
489 BBC (.030 over bored 4.25 stroker)
3959180 cam
12.5:1 rotating assembly(cast crank, 6.385" rods 7/16" rod bolts)
AIR GAP, INTAKE
RECTANGLE PORT HEADS #6272990.(port/bowl cleaned up)


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

as a low buck muscle car power plant, to go into a 1965 tempest with a muncie 4 speed , 4.56:1 rear gears , headman headers , etc. as he was severely limited on cash, and wanted to re-use all the parts he could, and while its not a big buck engine it destroys street tires for as long as the throttles depressed


you might find info here useful
viewtopic.php?f=44&t=5531

viewtopic.php?f=80&t=793&p=1150&hilit=baffle+exhaust#p1150