Thelo1

What's gonna possibly net me the best gains. Gm performance tbi intake for my vortec heads or a carb intake same heads with tbi adapter?no need for egr either not an emissions state.

Should have added that I'm also goin with 60psi pump 18 spring in a bored tbi

RS-Chevy-SS

Depends in your goal. IIRC Fast355 said the GMPP TBI intake will become a restriction at about 260HP on a 5.7. That number is most likely higher on a 5.0.

I have the Vortec TBI intake

Thelo1

My goal was to try and push it over 345 hp if I could, on the 5.7. Goin with the EBL flash also. Tryin to figure out a great intake cam head combo that will git me their. Any advice is always appreciated.

midias

My vote goes to RPM performer with TBI adapter

Thelo1

The gmpp intake is over priced anyways. And if it's gonna slow me Dow and 260. Then please keep the recommendations coming.

one92rs

iTrader: (5)

he may say different. but from reading if no need for egr Fast355 is going to tell you to go to a good single plain intake with your hp goals. hopefully he will chime in.

Thelo1

Yes sir after reading quite a few of his posts and replys I was hoping he would swoop in and give me all the super hero recommendations I need to start gittin parts ordered. And I need good can info too

Cam info

Fast355

iTrader: (2)

What is the engine going into?

The GMPP TBI Vortec intake is good for about 250-270 at the wheels or about 330 HP at the crank and 5,500 rpm. Above those power drops off pretty drastically. With the right heads/cam/compression I think it would top out around 350 HP at the crank. Boring it to 46mm helps, but I really do not feel its worth the time or effort unless you really need EGR. I have heard of someone taking it out to 50mm, but that gets dicey. The best TBI performance intake manifold is actually one that edelbrock never released for TBI but used for the TBI to MPFI conversions. It is a low rise single plane that accepts all stock bracketry and emissions components.

RS-Chevy-SS

Arent those limitations on a 5.7 motor? Wouldnt a 5.0 be higher?

Fast355

iTrader: (2)

In all honestly HP is a function of airflow and the intake is going to limit out at the same amount of airflow regardless if it is on a 283 a 305 or a 500.

RS-Chevy-SS

Figured by logic it could take less airflow to achieve the same numbers on a 305. Of course only if the surrounding parts enabled the motor to make that HP. Think im around 250 hp?

Fast355

iTrader: (2)

You are probably 260 HP at the flywheel and maybe 210 hp to the wheels with the modifications you have, if your tune is relatively close to where it needs to be. The main thing holding your setup back is that tiny 191/196 cam that is sitting in the engine 5* advanced and only bumps the valves .414/.428". I tuned a Vortec 305 truck that put down 235 RWHP and 308 RWTQ with the stock cam and stock intake manifold. Had a K&N FIPK, shorty headers, larger 350 2.5-3" Y pipe, a high flow cat, magnaflow muffler, electric fans, underdrive pulleys and a the tune.

RS-Chevy-SS

I think your estimations are about right per my butt dyno.

Wanted to have RF put a cam in it, but in the interest of preserving warranty, decided against it.