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Discussion Starter #1
Hi,
Friend of mine has a 428 cube SBF 13.1 comp
3V CHI heads 220 or 242cc runner...been awhile ....
Flow intake: CFM @28 Exhaust:
.100 76.9 63.0
.200 147.7 114.6
.300 209.7 155.8
.400 265.7 181.4
.500 311.5 203.0
.600 337.7 211.1
.700 353.5 220.5
.750 360.4 225.7
.800 360.0
1.73 Rocker
solid roller currently in engine...
IN EX
ADV 312 319
@50 279 288
@200 197 204
Lift .438 .438
109 lobe separation
106 intake centre line
engine made 700hp+
what do you guys think ?
cam recommendations please.

he wants this engine to go 800HP
May need manifold upgrade or modified CHI 3V currently.
 

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Those flow figs...did you see them with your own eyes or??? HP seems way off considering flow/comp/cid. Who's dyno & what SAE settings do they use?
 

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That cam could get you close if it had at least a 1.75 rocker but you need better intake port and manifold to get you near 800hp
 

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Discussion Starter #5
thanks for your response guys,
compression is a little under 13.1 & runs on pump 98.
ended up porting the intake port a little more on short turn & around the valve guide boss & retarded the cam 4 deg for P/V with 1.8 rocker, still think manifold is holding it back a bit.
engine made 760 hp 600 ft did make 800 hp on race fuel.
last time made 740 on pump.....think its about as good as i can get it for now, customer is over it!
 

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Hi,
Friend of mine has a 428 cube SBF 13.1 comp
3V CHI heads 220 or 242cc runner...been awhile ....
Flow intake: CFM @28 Exhaust:
.100 76.9 63.0
.200 147.7 114.6
.300 209.7 155.8
.400 265.7 181.4
.500 311.5 203.0
.600 337.7 211.1
.700 353.5 220.5
.750 360.4 225.7
.800 360.0
1.73 Rocker
solid roller currently in engine...
IN EX
ADV 312 319
@50 279 288
@200 197 204
Lift .438 .438
109 lobe separation
106 intake centre line
engine made 700hp+
what do you guys think ?
cam recommendations please.

he wants this engine to go 800HP
May need manifold upgrade or modified CHI 3V currently.
Have him tighten the exhaust lash down .008" and see how it acts at the track.
 

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I'm building a 427 inch motor for a 1/8 mile car.
Ported CHI 3v heads 2.93 average cross section 244 cc port
360 @.8 257ex no pipe
The motor is 4.125 x 4 x 6.0
15.2 comp.
Ron's toilets sheet metal intake.
1 7/8 x 2.0 step header
Can .865/.865 278-291 112 step
107/117 .
I'm shooting for 800 and change
 
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