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Batman · 07-20-2006, 06:04 AM

If you have a near stock engine either would be a waste of time. Get the LS6 manifold unless you are planning to do heads or increase cubes. The loss in low end will hurt you with a stock engine. On mine even when I did the heads the 90 was too much for it. Iswitched to the 78 and lost about 9 peak HP but gained 21 Ft/Lbs of torque and it came in 1100 RPM sooner. If you aren't making big power (I'd venture 500+ to the wheels) the 90 isn't worth it in any form. The reason it works well on the LS2 is the extra displacement.

07-20-2006, 06:04 AM	#6
Batman 11 Second Club Join Date: Jan 2005 Location: Fishkill, NY Posts: 1,278 iTrader: (1)	If you have a near stock engine either would be a waste of time. Get the LS6 manifold unless you are planning to do heads or increase cubes. The loss in low end will hurt you with a stock engine. On mine even when I did the heads the 90 was too much for it. Iswitched to the 78 and lost about 9 peak HP but gained 21 Ft/Lbs of torque and it came in 1100 RPM sooner. If you aren't making big power (I'd venture 500+ to the wheels) the 90 isn't worth it in any form. The reason it works well on the LS2 is the extra displacement. __________________ -Nick 9/11/01- Never Forget 2002 Pontiac Trans-Am WS6 # 206 Chasing 10's 469RWH/437RWTQ 11.05 @ 123