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Thread: FAST manifold on a 408
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11-21-2006, 08:17 PM #1
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Current best: 10.60/126.8- 1998 Pontiac TA WS6
FAST manifold on a 408
Does anyone have any dyno charts of how much they gained going from an LS6 to a FAST on a 408 (or a 402)? Any noticeable difference? Any track time improvements?
I'm trying to decide on whether or not to upgrade my LS6 to a FAST. The FAST should help out the larger displacement motors more, but I haven't seen any comparisons yet. I've seen plenty of comparisons between the intakes on 5.7L motors, but none on the larger displacement motors.
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11-21-2006, 09:01 PM #2
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trans am 00 ws6- 1998 camaro ss vert
better off getting the gm manifold very close to the same number as the 90 mm fast, at half the price.
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11-22-2006, 05:17 AM #3
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11-22-2006, 06:26 AM #4
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Red Tint Jewelcoat- 2008 Trailblazer SS
The FAST outflows the LS6 intake by a good amount.
But most motors can't take in that extra flow anyways. I would think the FAST would be worth 10-15 RWHP over the LS6 intake on a H/C 402/408.
I do not have any proof on it though.
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11-22-2006, 06:34 AM #5
on another board there's been compairsons that show as long as the cam has a nice intake duration it can fully take advantage of the 90 for 15-25rwhp, also having FI of some sort helps too.. Luos i'm surprised you're not using a 90 to get more o2 in that thing up in the mts
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