question about plastic intake manifold

[steve smith]

is it good how mutch hp and what is the price because im very interested just need detail about that because everibody talk about that

[Big Jon]

I beleive about 8 hp & $65. from Haynes Speed Shop. You may have to remount you dipstick.

[Black_GT]

About 8-10hp, add another $30 for a vanity cover, but don't use the foam backing that comes with it. You have to rework your stock dipstick bracket (not hard) or buy the updated dipstick (very cheap). Very worthwhile mod! Not just lighter, but less of a heatsink, and has a diverter to balance the airflow to all the cylinders.

Harry

[rszappa1]

and unless you go to a drag strip and get the official time...you are not going to feel 5 to 8 hp....plus your plugs become harder to change..

[Topless in Cali]

quote:Originally posted by rszappa1

and unless you go to a drag strip and get the official time...you are not going to feel 5 to 8 hp....plus your plugs become harder to change..

It depends on how much your GT is modded. I noticed a big difference when I started cranking up the BC after installing the plastic manifold. At higher boost, 18+, the metal intake manifold just doesn't flow like the plastic. And to get to the plugs, it just takes a universal joint on your plug socket!
The only advantage I see with the metal intake is that you could have it honed out to larger holes than the plastic, but it is a lot more than $65 for that and unless you're running a BIG turbo, I can't see spending a few hundred bucks for extrude honing and polishing

[Black_GT]

I would also disagree. I installed the plastic manifold when I was still S0 and immediately felt a difference. I feel this is one of those mods that ends up being greater than the sum of it's parts. On a stock GT, it may just be a blip on the butt dyno, but as your mods increase it serves as a foundation for more power and provides exponential gains...And as stated, a properly sized universal socket precludes the need for manifold removal to get to the plugs....

[rszappa1]

[8]Its called mind games...If you believe it enough you will be convinced...

[ATLPTGT]

Call me crazy but I find this debate really amusing. The LT-1 community sees this completely different. As the former owner of an LT-1 Camaro which came with a composite "plastic" intake manifold. One of the first mods to be done was to dump the intake in lieu of a metal manifold that created more power (dynoed 8-10hp). This was especially important if boost was going to added.

As I have not experienced a PT with the change I cannot comment on the difference it makes but in the Camaro getting rid of it did.

Just my 2c

[2step]

QUOTE:
"Call me crazy but I find this debate really amusing. The LT-1 community sees this completely different. As the former owner of an LT-1 Camaro which came with a composite "plastic" intake manifold. One of the first mods to be done was to dump the intake in lieu of a metal manifold that created more power (dynoed 8-10hp). This was especially important if boost was going to added.

As I have not experienced a PT with the change I cannot comment on the difference it makes but in the Camaro getting rid of it did.

Just my 2c"

You must be very easilly amused. A PT intake has nothing to do with a Chevy intake. Whichever intake has better flow is the one that will perform best. I'm sure you're right about those Chevy intakes.

The GT plastic intake was re-engineered to do it's job better than the old one. It is a fact that the Cruiser Turbo, plastic intake flows better, balances the cylinder filling better, has smoother insides, makes more power and is lighter to boot.

[Revmarc]

Actually, LT-1s didn't have plastic intake manifolds. That's the LS-1. I have owned 2 of them, and a 1994 Impala SS, and none of them had composite manifolds.