i wanna build about 400-450 horse out of a 327 for my 86 z. id like to know about what its gonna take. any help would be great

 

2 ways:

1. Nitrous

2. Heads with great flow, high compression, 7500 RPM

HP = torque x RPM / 5252

Torque is a function of 3 things: cubic inches (you have only 327), "thermal efficiency" which is mostly a function of compression, and cylinder fill which will never be 100% except for possibly in a very narrow band around some "tuned" point in the induction system. You'll be lucky to get much more than 400 ft-lbs of torque out of it at any RPM; and you'll need to have 400 ft-lbs of torque at about 6000 RPM to get 450 HP out of it.

It's alot easier with more inches.

 

AFR 210 aluminum heads, Holley Dominator single plane intake, Holley 830 CFM DP carb, Crane 280/288 PowerMax solid cam, ~10.5:1 compression, 1-3/4" headers, and two Dynomax Ultra Flow 3" mufflers should do it.

Oh. And a 3,500+ stall converter (if auto trans) and 4.10 + gears.

EA 3.0 says ~460 HP.

 

3. Blower

 

Welcome to the boards.

Dont let these naysayers get you down. They're simply trying to say that it would be easier with a 350, and more cost effective (proven, not monkey-spank)... but it's basically in the fuel delivery and heads, if you can figure out how to stroke your engine, I'm sure you'd have no problem figuring out the $'s to get your motor to 450hp

 

lightly ported vortecs and a good cam should make 400 hp easily-stock vortecs should probably do it with the right cam.

 

1st, Welcome Aboard.

Okay, what is it going to take? I'd figure on about $5000. Not only do you have to make it, you have to keep it together.

Or, for about the same money, http://www.sdpc2000.com/cart.asp?act...120&pid=156334

 

damn. id love the GMPP 383, but i dont have 5 grand right now. what if id rebuild the 327 with around 10.5-11:1 compression, hillbilly ported 2.02 camle back heads, good cam (dont know how big yet, need a little help) performer RPM airgap intake, and headers around what would i be looking at.

 

If you really want to make horsepower....spend some extra money on some good aftermarket heads ( Aluminium best IMHO ).

Head technology is so far ahead of the double bumps it just doesn't make sense to even bother with modifying them. You're dealing with 30+ year old technology. In the end you'll spend almost as much money as buying new, reconditioning, porting, new guides, valves, springs etc....and you'll still have a set of 30+ year old heads.

 

close

 

where could i find that dyno program you guys are using? Any help would be apreciated.
Thanks