Hey guys

My goal is a 485 crank horsepower 383

Currently have a converted LT1 intake manifold, but I am open to getting a Miniram if I have to. LT1 manifold should flow around 310 CFM

Scat 9000 stroker crank, Eagle SIR 5.7" rods, Icon forged 9914-030 pistons.

Aiming for 10.7:1 compression with the AFR 195 street heads, 65 cc combustion chamber. Flows 275-280 CFM from 0.500-0.550" lift

What cam will get me to 485 chp?
236/242 duration 0.576" lift?
Or do I need bigger heads?
6300-6500 RPM redline track car.

Will the miniram outperform the converted LT1 intake?

Thanks guys!

 

A 1205 miniram would be slightly better, but doubt by much. Not worth the upgrade. If the heads were bigger with a 1206 port then a 1206 ported miniram would be better

id keep the lt1 for now if the ports match the heads. Guys have pushed those pretty far.

236/242 is ball park imo. Check out advanced inductions lt1 cams. They have done this combo before but with slightly better heads of theirs. But i think you’ll be happy with something of that spec. 110 lsa or so. Bit rough idle but do able. Those lt’s have always done decent with tight lsa’s.

 

218/228 on a 108 LSA and 106 ICL with 0.578 lift is enough to get a 383 over 500 hp, I know because that is what is in mine. Lloyd Elliot speced several of the cams in Karl Ellweins 383 LT1 builds and they have gotten around the 500 hp mark. I would expect the cam you have in mind to make about 530-550 hp and peak closer to 7K.

This one had the old GM 846 Crane 109831 cam. 222/230 on a 112 LSA. It made 500 hp and 527 TQ. With good heads the cam does not have to be nearly as large as some believe to make great power. Case in point the little 222/230 peaked at 5,900 rpm and was still making 485 hp @ 6,200. 527 ft/lbs @ 4,000. It actually made those numbers with a dual plane intake and a carb. A short runner EFI intake like the MiniRam will carry the power longer up top.

http://www.ellweinengines.com/ERE45/ERE45.htm

 

it could maybe on high compression and absolute killer heads, but i wouldnt call afr 195’s out the box all that killer. They are nice tho. At first i thought he meant the enforcers so i went bigger on cam.
​​​​​​​Did you ever get actual dyno numbers on that combo?

230 deg hyd roller is about 400 whp in afr 195 street heads. Some see abit more. For most builds in most dynos. 6250 rpm ish peak. Shift by 6600. Thats how mine was.

 

412 hp and 430 tq at the tire on a Mustang Dyno through a 4L85E in 2nd gear and a GM 10.5 14-bolt.

At 6,940 lbs, 4L85E with a stock diameter custom built converter flash stalling ~2,900 rpm and a 3.73 gear it went 9.1 @ 74 on a 2.1s 60' in the 1/8 in 3,600 ft DA. It needs gears or a 6L90E swap badly.