This is what I'll have, pertinent or not:
88 formula - used to be a 305

355
auto
350 heads double spring
flat tops
Vortech roller cam
single roller timing chain
AIR and AC removed
poly motor and trans mounts
8mm wires
24lb injectors
stock maf
stock manifolds
k&n

I think that's all. What kind of hp do you think I will get from this? Assembly should start later this week assuming the machine shop actually finishes with the block.

 

Two questions:

What cam? (Saying "Vortech cam" tells us nothing. Do you mean a cam out of a Vortec engine, or something from the company called "Vortech"?)

What heads? (Saying "350 heads" tells us nothing - there are a bunch of 350 heads out there, a lot of them are worse than 305 LB9 heads.)

Observations:

Assuming the cam is a Vortec cam, and the heads are L98 heads, I'd guess around 230 HP. The 24lb injectors won't do anything for an unmodified TPI, and aren't justified without a radical flowing cam/head 350 combination. Better to spend your money on an AFPR and 22 lb injectors (the 19's would probably work fine with AFPR). MAF is going to limit you to about 500 CFM, which is fine with stock runners. Stock runners will limit you to about 5000 RPMs.

You'll likely have more torque than the 305 had. But, air flow is key to power, and without knowing more about the cam/heads, guesses are moot. And, having done nothing to improve the TPI (24 lb injectors don't count) or exhaust systems (read: headers), power is going to be severely limited.

I would think.

P.S.: This post https://www.thirdgen.org/techbb2/sho...hreadid=147248 has a few choices for power estimaters. Assuming your GTA weighs about 3500 pounds going down the track, it's putting about 240 HP to the wheels - not bad.

 

GM cam from the Vortec engines.
.410 .424 202 207 duration at .050 115 lobe center
from http://www.competitionproducts.com/page51.html

heads - casting 10110810. Some people say these are from a 305 station wagon. I hit 42 sites. All of them said they were 350 heads except 1. I'm willing to bet they're 350 heads.

I realize the injectors aren't going to make a difference. I just figured I'd throw it in like some of the other stuff that isn't truly hp related.

GTA - I was somewhat impressed when I did that calculation and came up with that hp at the wheels. Either GM underrated the car, I got a factory freak, or what little I did to the car actually made a difference.

 

i'd also guess around 220 to 240. the time seems about right for the mods, not sure what seems freekish about it.

 

I'd go for a better cam. The Vortec take-off was taken off for a very good reason.

I'm not sure about those heads. Mortec.com calls them "91-up 350 Gen I". If they're swirl port - don't do it!