regency

iTrader: (15)

with the mods in sig. how bad is the ls1 intake hurting me on top end. cause when i hit third gear it feels like its not pulling as hard.

Blorton

iTrader: (2)

Wow, cam and long tubes and still running the ls1 manifold? Go for the upgrade. You'll kick yourself for not doing it sooner.

I just went to the fast90 myself from the ls1 - huge difference everywhere, and the motor now has a genuine top end, even with stock heads and cam still in.

Hth,
Dan

Randy WS6

iTrader: (69)

At least get a LS6 intake. or go with the FAST intake

regency

iTrader: (15)

well how would the fast 90/90 setup be on a truck that weighs in over 4000lbs. i think the ported fast 78 would be efficent

SS101

iTrader: (2)

go with a 78mm for stock cubes...90mm is just overkill for a 346, it'll cost you more and the difference will be marginal if even at all

blk00ss

iTrader: (66)

Yeah, everyone knows that 346's with a 90/90 set-up are SLOW....

ERIK@MASPORT

iTrader: (32)

The FAST 90 is not overkill on the 346.

I picked up power (about 25-30 rwhp, give or take) when I swapped the LS6 for my 90/90 set up. I did have it ported though, which helps!

If you plan on revving to the moon, then a FAST will shine. I run the MS3 cam, which is known to be a top end power cam, which I enjoy at the track, and on the street.

My low end power isn't as much as it could be, but when I hit 5000 rpm, forget about it- BYEBYE...ps, that is what my dual stage is for lol

I think you will be just fine with an LS6 manny...the FAST is a cherry on the top if you know what I am saying...

Erik

Dom

iTrader: (2)

Yeah LS1 intake is holding you back even on a completely stock car. My first mods were lid and LS6 intake and what a difference. The motor felt stronger everywhere. 90/90 is great, but it's a ton of dough. I would get it in a heartbeat if it was cheaper. It doesn't have the same bang for the buck as a $300 LS6 intake.

tee-boy

iTrader: (8)

Talked to a fella in the shop @ Thunder and he said there is no reason to buy anything less than a 90mm tb; no matter what the motor. So forget buying a 78mm.

sidewayz28

iTrader: (24)

if your on a budget LS6 intake... and if it doesnt matter i say FAST 90/90.

CETA_TransAm

iTrader: (1)

i was looking at some dyno graphs for 78mm vs 90mm and the 90mm only had like 5hp over the 78mm fast intake

stangkiller2005

iTrader: (15)

i cant wait to get my intake!

regency

iTrader: (15)

thanks fellas, i called them at fast and man that freakin setup is expensive so i might just try to get a fast 78 or ls6 and have either one ported