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Old 03-23-2013, 09:55 AM
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Flex Plate

I have an 85 350 crate engine. I need a flex plate that will fit the engine and accept a 700-R4 trans. The center hole needs to be 2 1/2". the engine will be going into a 41 Chevy 2 door Coupe. Someone suggested that an 88 1/2 ton woud be the place to start (at the parts stores). I tried the "FRA-159" from Autozone but the plate hole is to small, I need something with a center hole of 2 1/2".
Another question I have is how to determine if my engine is internally balanced or not?

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Old 03-23-2013, 10:23 AM
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Two piece rear seal 350 SBC is internally balanced. One piece rear seal is externally balanced on flex plate/flywheel.
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Old 03-23-2013, 11:30 AM
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You also have to determine if it's a 153 or 168 tooth flexplate that you need.And when looking, the bolt pattern on a stock 700 converter is 10.75.

Last edited by rick 427; 03-23-2013 at 11:44 AM.
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