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Old 12-20-2010, 06:41 PM
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SBC Flywheel / Clutch Question

I bought a Muncie M21 that came with a flywheel, clutch and pressure plate. It was on a small block in a '55 Chevy, and I'll be using it with a small journal (1967) 327. I don't have a lot of experience with small block Chevy's, so have a few questions. I'm not interested in reusing the flywheel, clutch and pressure plate because I don't want any problems. My question is this: The setup tht came with the trans is a 14" flywheel with a 10.4" clutch. From what I've read, the 10.4" clutch is usually used with a 12.75" flywheel, except very early (pre-'62) . Does it make a difference? What should I use? It will be a mld 327, about 300 HP. For street use only. The engine I bought (from someone else) came with a brand new starter that has two bolt holes parallel (I think this is the small 53t flywheel starter). So it seems I should use the smaller flywheel with the smaller clutch and the starter will fit. Would there be any issues with the 12.75" flywheel on the 327 crank? Sorry for all the questions, but I want to get it right. Thanks.

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Old 12-20-2010, 08:26 PM
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No problems using the 12.75" 153tooth flywheel on the 327, bolts right on, and will fit the starter and 10.4" clutch like you plan to use.

You're correct, the 14" 168tooth flywheel is normally used with 11" and 12" clutches, for more holding power and longer life. With your planned power level you should be fine with the smaller flywheel and clutch. Yes, the straight across bolt pattern stock starters(not race mini starters) are for the smaller flywheel you have.
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Old 12-20-2010, 09:29 PM
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Thanks. Now I understand.
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