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FAST 78mm to FAST 90mm?

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Old 03-31-2011, 06:55 AM
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Default FAST 78mm to FAST 90mm?
My car came with an older FAST 78 intake. I can buy a FAST 90mm top half new. Does anyone know if it fits the 78mm bottom half?
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Old 03-31-2011, 05:38 PM
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no.the fast 78 is 3 bolt TB,the fast 90 is 4 bolt TB.
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Old 03-31-2011, 06:53 PM
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I would call fast and ask them im guessing your going to go with a 90mm tb now as well
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Old 04-01-2011, 12:18 AM
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I believe the bottoms were the same on the 78's and 90's, the tops were the difference.
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Old 04-01-2011, 12:26 AM
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the bottoms are the same. good luck finding a 90 top tho
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Old 04-01-2011, 09:02 AM
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A member here did an excellent write up on porting the 78 to 85mm.

Or you can buy the 90 upper. Bottoms are the same.
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Old 04-06-2011, 05:38 PM
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Originally Posted by 70hemicuda
the bottoms are the same. good luck finding a 90 top tho
thanks for the info, they are actually on sale here new

http://www.byunspeed.com/product_inf...oducts_id=2481
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Old 04-21-2011, 07:42 PM
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Originally Posted by 02Z28ZO6
thanks for the info, they are actually on sale here new

http://www.byunspeed.com/product_inf...oducts_id=2481
I dont see them... where on the site are they... not under gm , intakes
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