GRFMotorsports

iTrader: (15)

Simple question I hope... Im putting together my first Gen III engine, mild little 6.0L should hit about 500 hp. One of my questions is about using the 6.0L intake manifold. This will be in a heavy car (4500#) and hood clearance should not be an issue. Which is better and by how much for an engine that needs some good bottom end torque, the truck manifold or a LS6 intake? I have heard that the truck intake is pretty good. Is this true? Thanks!

bbfirebird

I don't know this for a fact, but I would imagine that the truck manifold would be geared more towards low-end torque than high-RPM power. Maybe someone else can chime in on this..

GRFMotorsports

iTrader: (15)

Let me also add that my shift point should be somewhere between 6500-6800 rpm I think.

slimcracka

iTrader: (7)

i they did this comparison on the truck side..they said that the truck intake flowed right with the ls6 to about 5500 but then fell on its face..do a seach on the truckperformance website.

Ωmega

iTrader: (28)

He's right, the LS6 outperforms the truck manifold (accross the board, I believe) but very much so above the 5500 mark, like he said. Go with the LS6, it's your best bet

jrp

iTrader: (16)

the long runners of the 6.0 intake stifle its rpm capabilities. that being said, whats the rest of the combo?

Cheatin' Chad

iTrader: (3)

I have tried to push that intake as far as it will go. It is no good above 5,000 RPM from what I have seen.

All testing with this was done on an '04 Silverado SS. After trying everything I could think of everything I did pointed to the intake absolutely killing me.

Silverado SS:
Heads(Patriot SIII/mild mods by me)/Cam(231/237 custom cam)
200 wet shot
Headers
Tuning
Volant CAI
Converter
22" Rims and Nitto 555s
Pump gas
Dropped 2.5/4 and air bags

The truck eventually went mid/bottom 11's. I feel we could have cracked into the 10's with a good intake and a trans that wasn't on it's way out.

If you're not running a mild engine that you want modest performance from ditch this intake.

GRFMotorsports

iTrader: (15)

I think Chevy Hi Performance did a side by side flow test back in 04 on these but I cant find the article. The flow numbers were close, I just dont remember where it fell off at. I was hoping the 6.0L intake would be close to an LS6 but its not looking that way so far. I can get one almost new w/ everything on it for under $100 vs what the LS6 intakes fun. Just tryin to keep it a cheap project. As for the rest of the engine... nothing is set in stone, Im still accumulating parts.

camaroextra

iTrader: (10)

consider also an ls2 intake

Cheatin' Chad

iTrader: (3)

I saw the same test. I have the mag somewhere around here. I don't care how close they look on the bench. When you start leaning on the motor it's a detriment.

If you are building a mild engine it will be fine.