I thought it was built

 

Top end is stronger than the stock bottom end. When I change tuning programs, I'll spin it faster. Maybe 6500 or 7000. Gotta find stock size forged piston first

 

Stock rods? Forged crank?

 

What year?

 

And please tell me you upgraded the 3 speed trans

 

There's no upgrade lol. The th400 is a drag tranny, I'd need to get a seperate computer to control a 4L80E or revert to a 700r with a manual kickdown cable

 

They never put forged internals in any 454's

 

So it's a 3 speed with 3.73s?

 

Yup. The 91-93 had a 4L80E with 4.10's in the rear end. Gets about the same mileage as the 90's

 

When's it gonna be done then?

 

Put back together or pushing 20 psi?

 

Well boosted

buy this: around 8:1cr

http://www.summitracing.com/int/part...make/chevrolet

 

Won't be for a couple years

 

So you are gonna run it no boost?

 

I'm not going to turn it up past 8-10 for a while

 

this is where aftermarket balancing and align honing come into play;
They both play into being able to extend useable rev limit.

there is absolutely nothing wrong with the th400, most guys not wanting to go to a computer assisted automatic want a th400;
In years bygone I swapped one into my youngest brothers '77 Trans Am - as an upgrade from the original th350.

 

I still think you'll need fueling or tuning past 10psi

 

I have a 255 LPH pump, slightly larger injectors and an adjustable regulator. Fueling is fine. I was looking at a gear vendor overdrive unit but those are $3,500.

I can get forged cranks and rods, finding stock bore pistons is the problem

 

But good enough for 20psi??

 

With only 4 injectors for it to be enough fuel I'm guessing the injectors will have to be at 100% duty cycle pretty much stuck open under WOT

 

For around 600whp at 80% IDC it'll need 141lbs or 1500cc injectors at 43.5psi

 

Your 80lbs are good for 535bhp at 43.5psi

 

only 2 injectors. both are about 90 lbs/hr at a certain fuel pressure. Not sure what pressure it is

 

If you increase the fuel pressure from what they are rated at it will improve the injector flow until you have too much pressure and then you'll be out of the pump efficiency window but only with 2 90s I think you'll be fine. I'm guessing your fuel pressure will increase 1:1 with boost so you have ~43psi at idle and 53psi at 10psi of boost?

 

8-13 psi at idle is stock. The tbi is good for up to 450-500 hp