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SC engine pistons wrist pins

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Author  [Modern View]

07-12-2012 06:12:30

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Two questions: (1) How can one determine if piston wrist pins need to be replaced when replacing rings, crankshaft bearings & new head valves? They feel like factory new, but have no way to test them. (2) Engine has flat-head pistons. Was wondering if replacement with firedome pistons would raise horsepower, and if so, by how much.

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El Toro

07-15-2012 13:08:44

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 Re: SC engine pistons wrist pins in reply to BoonvilleKid, 07-12-2012 06:12:30  
Why don't you buy a new sleeve kit that has new pistons and rings. Take the old connecting rods to your local auto machine shop and have them install the new pistons. They will make sure the wrist pins have the correct clearance.

Have the crankshaft measured for wear and buy your bearings from the machine shop. They can determine if the shaft needs to be ground undersize. They won't do it unless it needs it. If the shaft has undersize bearings they can furnish the correct bearings. It's possible it may have been ground undersize.

Have them do a valve job. If the valves are getting thin 1/32" replace them. If the guides are worn replace them. I would also replace the valve springs. Then you engine will last a long time . Hal

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