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Bolt pattern dimensions for FAST 90/92mm TB or other aftermarket TB

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Old 04-11-2010 | 06:13 PM
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Default Bolt pattern dimensions for FAST 90/92mm TB or other aftermarket TB

Do the FAST 90 or 92mm throttle bodies have the same bolt locations as a stock unit?

I did some measuring and calculations yesterday and a stock unit has enough material between the bolt locations to clear a 92 mm opening. Basically, other then the manifold opening being smaller than the TB opening, would a FAST/Edelbrock/Nick Williams aftermarket TB bolt to a stock manifold?
Old 04-11-2010 | 11:10 PM
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Herro?
Old 04-11-2010 | 11:18 PM
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Same stock location for what stock intake manifold?

The 78mm intakes are a 3 bolt, and the 87mm+ are 4 bolts.

Check this link, its a huge picture of a direct port fast 90 90.
https://ls1tech.com/forums/attachmen...p-img_0037.jpg

It almost looks like it accepts two different style throttle bodies doesn't it?
Old 04-11-2010 | 11:32 PM
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I know the edelbrock TB's have both the three and four bolt mounting points
Old 04-11-2010 | 11:34 PM
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That FAST looks like it takes the 4 bolt and 3 bolt TBs. My question is for the 3 bolt intake manifolds, LS1/LS6 and other 3 bolt intakes.
Old 04-11-2010 | 11:35 PM
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My original throttle body was a 75mm unit, while the marine intake manifold has a 78mm opening along with the ported/polished LS1 unit that is on it now. Im thinking if a 90/92mm aftermarket unit will bolt up to the stock bolt locations, I can have the intake machined for a 90 or 92mm opening. The intake is aluminum.
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