Can any one estimate Hp of an engine? read details below?

Question

small block chevy 400 bored 40 over; with flat top pistons producing around 10:1 comp with RHS cast heads with 220 intake runners and a Holley Street dominator and a 750 ho series carb: Scat 9000 with 3.75 stroke with 6 inch rods and a complete Comp Cams valve train magnum 292 with 501 lift : 1.52 roller tip rocker.

Answer 1

from what i can gather around 425 on it,it may come out to be more once put on a Dino it may be more ,its kind of hard to judge them like this,good luck hope this helps.

Answer 2

I'm with the other guy on the smaller intake runner cylinder heads. It's all about flow velocity on the street. For the money you could have bolted on a new set of Chevrolet Vortec heads. They come in two versions. One has 185cc intake runners with a 65cc exhaust port. The other is 215 on the intake side and 84cc's on the exhaust. On your motor you'd have gotten conservatively 50 horses at the very bottom of the rpm range where a 400 likes to run with not a single other change. Be extremely careful with a 400 stock block. I'd keep the rpm's under 5,800 at all costs. Dart and Chevrolet make a better quality stiffer race block that can be bored to 4.185 safely. I hope you don't have the core shift that the stock 400 blocks are noted for.

I'm not slamming your RHS cylinder heads their one of the very best around.

We have a late model dirt class where 360 cu in. is the limit for Chevy's. Rules allow any cast iron head and we can do anything to them. Any intake but we have to use a Holley 500 CFM carb. 99 % of the guys use Willy's Carburators. Any flat tappet cam. It's not a bit unusual to get 7,300 rpm out of a 360 inch chevy. As for the heads 200cc intake runners with tiney 49 cc Dart Platinum heads. These motors dyno out at 530 -540 horsepower. on race gas.

Answer 3

Good stuff. You may want to step up the cam and carb though. With a better cam you can hit 500 horse easy. If your gonna be running an automatic your gonna need a higher stall converter too. The way you're set up now your looking at about 400-425 horse. BUT you will be a little soggy off the line. If it's for your street car I'd trade the heads for some 180 cc runners and keep everything else the way it is.

Answer 4

Bill w is off about 100 hp.

Answer 5

i would say 400 to 425 also.

Answer 6

I'd guess around 325 h.p.

Answer 7

350 maybe? idk? sorry