vbls

iTrader: (17)

my car is a stock long block for now (cam later on)
i have the weiand air gap aluminum intake on there now. ported/polished throttle body. i can get a fast 78mm from a friend, would that help me much being the same size intake or should i just save up for the bigger?

also my Nitrous plate kit is 78mm

Sales1@Texas-speed

I would not expect you to gain much if anything, but I definitely prefer the composite intake manifold setups over the aluminum in most cases. I would recommend saving up and when you are ready to upgrade go with the Fast 102 setup. Keep in mind you will need to upgrade to a 102 nitrous plate as well.

v84life

Got 20whp/22whtq with a ported fast 78 with cam/I/full bolt on and stock 241 heads.

SweetS10V8

iTrader: (4)

Ive engine dyno tested the FAST 78mm on a stock LS1 engine, with an LS6 manifold.

The FAST 78mm made definite power gains through the entire RPM range. Although not a direct comparision, most non fast LS manifolds basically are equivalent to the LS6 from my research. So tha FAST still should easily make more pwoer than your wieand

boostit5.3

iTrader: (3)

i would run the fast...

stngh8r

This gain was compared to LS1 or LS6?

KCS

iTrader: (20)

I got a FAST 78mm for cheap that will be going on my car. Once I get back on the dyno, I'll do a back to back comparison against the LS1 manifold that is on the car now. With the LS1 intake, its already making 410whp with 241 heads.

99Bluz28

iTrader: (35)

IMO, get the FAST 78.

dr_whigham

iTrader: (49)

I ran one; Absolutely loved it. I had it paired with a Shaner S3 ported throttle body, which at one time, was about the best combo available for these cars. Only reason I sold it was bc I picked up my 92/92 setup on here for dirt cheap.

thunderstruck507

iTrader: (18)

I would get it. If you don't want it I might have a friend who is interested.

Zmg00camaross

iTrader: (11)

I am running this set up right now. Still doing work.

newchevyman

iTrader: (15)

This thread was started in November 2011, I think he's probably made up his mind on an intake manifold by now haha

01ssreda4

iTrader: (96)

Still good info, remember the 78 is the same as a 90/92 just with a smaller snout.

thunderstruck507

iTrader: (18)

And it can also be ported to 85mm by using a paper throttle body gasket.

But don't forget the primary gains from a Fast intake are in the design of the manifold and it's runner sizes which are behind the TB and are the same for the 78/90 and I believe the 92 had slight revisions.

the 102 is a whole new design

01ssreda4

iTrader: (96)

Agreed.....

badazz81z28

iTrader: (6)

I think the price will be the factor here. I would stick with the LS6 intake, if the seller is out of his mind. I have seen old 78s for as much as $650! I would pass, wait, and save for at least a FAST 92. I don't think the FAST 78 is the same as the 90/92....I'm sure I have read that somewhere.

dr_whigham

iTrader: (49)

The runners are, as far as I know, and that's where the gains are from.

thunderstruck507

iTrader: (18)

The only difference was the top shell which is what the snout is built onto.

IMO a 78mm is a good option especially for a bolt on or cam only car that will be limited by head flow before it is limited by TB size. You can use the stock TB if I recall so you cut down $200+ from the price of the swap and don't have the tuning headaches of the bigger TB. Then later it can be either ported to 85mm or you might find a 90mm upper shell from a broken intake to swap on.

I generally see them sell for $400-450 but it's rare they turn up at all. So it's up to the buyer if it is worth the extra price over a ls6. I would expect one to gain ~10rwhp over the ls6 intake.