IROC R/T

Got a friend putting together a big block chevy. What's your estimate on power? 454 but stroked to a 427, stock oval port heads 1969 396 with 101CC chambers, domed pistons( so I would guess at least 10-1 compression), .700" lift roller cam, single plain high RPM intake. It's just bolted together- no balancing or blue printing or even degreeing the cam. Also he is using a stock fuel pump and fuel lines. I can't see this combo producing lots of power but I am not really a big block chevy guy- to me it looks like the heads will limit HP and give it areally peaky power range.

slow trap

iTrader: (22)

those oval ports will be good on the torque but with a cam with around .700 i'm sure it has a narrow lsa the bleed-off may kill alot of it.i'll say 550 hp.

IROC R/T

I was thinking the high RPM stuff will make it a dog until 5,000 or so then the heads and fuel pump will choke it at about 5,500. I think he would be darn happy to make 550HP. Thanks!

IROC R/T

things have changed- now it's going to be a 454 with a .650 lift cam and 12-1 compression and 781 heads. Block and heads were cracked on the other engine.

slow trap

iTrader: (22)

i don't know about the stock pump but i know a stock 3/8 fuel line will support alot more power than people think.

IROC R/T

He is thinking he is going to make 850HP I don't have the heart to tell him the mis-matched and used components coupled with his knowledge will be lucky to make 500HP.

Villain281H

iTrader: (5)

850 hp? doubt it, the stock pump won't come close to supporting that kind of figure. Better heads is the first place I'd look, then a decent fuel system.

Derek

CarelessAndImprudent

Easy 550 hp, definitely 600 if he sets it up right. That 12:1 is gonna want a lot of spark and a helluva lot of octane. What do you mean by stock fuel system though. That's gonna be one of the big limitations along with the heads.

IROC R/T

stock fuel lines and pump. I am sure he will be using a stock GM HEI. Definitly won't be set up right. How bad can you he mess it up is what I am wondering?

slow trap

iTrader: (22)

tell him to splurge and get a good fuel pump atleast.

crazycamaro496

iTrader: (2)

I've got a 496 with a cam not much smaller than his. I kept it small for street use, although it's a solid roller. Aluminum Dart heads, Weiand intake, 950 Holley, Aeromotive fuel system...The motor is about 10.2:1.

The car made 463hp/588tq to the rear wheels on 93 octane. The cam is really holding it back, but I kept it small because I like to drive it. His compression will help make power, but have him pick a good cam and fuel system.