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It’s getting a new converter this season too, looking to get a 9-9.5” unit that’ll go 56-5800 on the brake. Currently has a 10” unit from Hughes that stalls at 4600 on the brake. We figured if we can get it to a 7500rpm shift point, it would just be easier to get it to run how we need it to, and we could use less nitrous.
How much nitrous do you run now and what does it run as is ? And how fast do you need to run ?
 

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Discussion Starter · #62 ·
Hoping to get it to be able to run 5.70/8.90. That would give us enough to run just about any index racing our “local” tracks do. Its been 6.70s as is now, we’ve sprayed 200 on the street. But if we can get it to be able to run an 8.90-9.00 1/4 mile at 2950, with as little nitrous as possible, that’d be the ticket.
 

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Chris Cobb at Dynotune Engineering did a dyno test on a 700 hp 434 from skip white. It made around 630 hp on his dyno. But with some modifications, another camshaft and porting to the AFR 220 heads it made over 700 hp !
Hmmm i'll have to look that one up, I might have a little trouble believing a 434ci. with more compression and almost the identical cam as my engine is making less top end power compared to my 10.7 to 1 399ci. with bigger heads topping out at 6400 rpm.
 

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I still think the Speier/Profiler 220 that does and assembles would walk all over the AFR 220? And now someone needs to go thru and check the AFRs before installing.
 

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I still think the Speier/Profiler 220 that does and assembles would walk all over the AFR 220? And now someone needs to go thru and check the AFRs before installing.
I would like to see a SB 23 degree dyno shoot out. I just have full comp race port afr 210s and been looking at other std heads slightly bigger and even just this small 210 runner - Race port on paper from them shows it flows just as good or better than most others @ .650 Inatke - 322 . Ex very good with 237 cfm at only .650. Im wondering how close other benches get. Some of the other heads dont have raised ex ports though which is nice for off the shelf headers.
 

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I would like to see a SB 23 degree dyno shoot out. I just have full comp race port afr 210s and been looking at other std heads slightly bigger and even just this small 210 runner - Race port on paper from them shows it flows just as good or better than most others @ .650 Inatke - 322 . Ex very good with 237 cfm at only .650. Im wondering how close other benches get. Some of the other heads dont have raised ex ports though which is nice for off the shelf headers.
Whoever can fit the biggest valves wins lol. I'm still rocking 2.08, was going to go to a 2.10 but didn't happen.
 

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2.125" valve x .90 = 1.9125/2 = .95625 x .95625 = .9144 x 3.14 = 2.87 sqin.

5/16" stem.... .3125/2 = .15625 x .15625 = .0244 x 3.14 = .077 sqin.

2.87 - .077 = 2.79 sqin.

So a 2.125" valve is just a little on the small side to make 750hp at 7500 rpm with 12.5 cr. at 400 cuin. but can be done with a increase in VE.
 
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