[GTVega]

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 ?

 

[18degsbcregal]

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.

 

[heshtesh]

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.

 

[tblentrprz]

How much massaging would piston need to fit AFR 245?

 

[NPS Nova]

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.

 

[BBF612]

No matter what head/valve you run the port CSA needs to be as big/maybe bigger as the throat CSA.

 

[another69camaro]

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.

 

[GTAShief]

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.

 

[BBF612]

With 12.5 CR you would need about 340 cfm and a 2.9"/3.0" CSA to make around 750hp.

750/340 = 2.2hp/cfm

 

[Chad Speier]

23º of BAD ASS

 

[BBF612]

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.

 

[stuska1]

The more I do this shit , the less I think about flow numbers.

 

[BBF612]

The more I do this shit , the less I think about flow numbers.

That's because those who have done it a lot know a lot, not like us dummies that need to do math.

 

[18degsbcregal]

How much massaging would piston need to fit AFR 245?

.050-.060”

 

[stuska1]

If you focus on size and shape, flow numbers should be there , if you focus on flow numbers you can get in the weeds

 

[BBF612]

Take this MBE SBC head, 2.32 intake valve and flows 495....

MBE SB Chevy Billet 4.400 | mbellc

www.mbellc.com

2.32/2 = 1.16 x 1.16 = 1.345 x 3.14 = 4.23 sqin. x 117 cfm/sqin = 494cfm, pretty close. So size does matter.

 

[stuska1]

Take this MBE SBC head, 2.32 intake valve and flows 495....

MBE SB Chevy Billet 4.400 | mbellc

www.mbellc.com

2.32/2 = 1.16 x 1.16 = 1.345 x 3.14 = 4.23 sqin. x 117 cfm/sqin = 494cfm, pretty close. So size does matter.

2.32 x 2.32 x .7854= 4.227 😁😁

 

[BBF612]

I told you I'm a dummy, lol.

 

[stuska1]

You just went the long way. Lol

 

[tblentrprz]

.050-.060”

I'd do some massaging and run the 245. Maybe that's just me though.