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Discussion Starter #1
I'm in the early stages of replacing my 289 with a early 302.
The engine builder needs a damper and flex plate
so he can balance the rotating assembly. My question is what flex plate should I purchase.
The summit catalog list two possibilities.
1. Part number BMM-50246- small block with c-4 trans., 157-tooth,int balanced
2. Part number BMM-50236- 1968-76 289-302 with c-4 trans, 157- tooth 28.2 oz., balance weight.
Thanks
 

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Discussion Starter #3
The engine builder is building a short block for me. He list two different 302's in his add.
One being a two piece seal and the other one being a one piece. I went with the two piece, if that helps identify the year.
 

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The teeth and diameter of the flex plate match the transmission.

The weight matches the engine. 28 oz for a pre 1982 302 and 50 for a post 82.

So you MUST know the year of the engine, AND the size of the tranmission.

Do a search for 28 AND 50 and you'll find more info.

.
 

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Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
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If the 302 is a pre-1981 engine, you want the 28 ounce imbalance one.
The "internal" balance flexplate is racing stuff, where the balance of the crankshaft has been radically modified ($$$$).
 
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