Hemiman81

I'm looking at building a 1971-75 two door impala or caprice and my goals are anywhere from 600-800rwhp n/a. Is that possible? If so what size block do I need and other supporting mods or upgrades?

v8sten

iTrader: (5)

either a really bad *** small bock chevy or a little more than mild big block

Hemiman81

I'm in between a small block 400 or a 572 big block.

93 LT1 Vette

421, 434 or 454 smallblock will get you to the lower end of your goal. 13 to 1 slugs .700+ plus roller cam, victor jr intake, 227 or bigger heads and 850+ cfm carb. 10 grand minimum, maybe more and not very streetable.

Hemiman81

[QUOTE=93 LT1 Vette;17525405]421, 434 or 454 smallblock will get you to the lower end of your goal. 13 to 1 slugs .700+ plus roller cam, victor jr intake, 227 or bigger heads and 850+ cfm carb. 10 grand minimum, maybe more and not very streetable.[/QUOTE I was hoping that the weight of the car would help traction so it can be streetable but I may have too drop the hp down too just maybe around 550-650rwhp

93 LT1 Vette

The Impala weighs a bunch. I'd key more on torque to get it moving out of the hole. A much milder bigblock maybe a better option. Check out Jeg's or Summit a crate motor most like will be your best option.

Hemiman81

Ok that I will do! Thanks for the info!!

Hemiman81

Would it matter if its fuel injected or carb?

93 LT1 Vette

Carb and intake would be much cheaper and make the same horsepower as FI but harder to keep in tune with season and weather changes.

Paul Huryk

You will need a large CI, high revving SBC to make the lower end - and it may not be that streetable due to the power curve and necessary gears and converter. In this case, cubic inches rule as the power will be at lower RPMs with a larger motor, plus the extra TQ will get that heavy thing moving.

Have you ever thought about a nitrous kit? It adds both HP and TQ and will allow you to build the motor for lower RPMs, which should make it much more streetable.