Need help identifying my 400 chevy pistons. - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-25-2007, 12:54 AM
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Need help identifying my 400 chevy pistons.

I have a 400 SBC that had pre-ignition in cylinder 3. The result was a chipped piston with hairline cracks in it. The other 7 are still in great shape. I'm hoping to salvage these pistons and try to replace the chipped one only. The problem is.... I can not seem to find any distiguishing marks on the piston to identify what brand or company it is from. If I go to my local parts store, no effort will be made to help me. I'm bait for them to try to sell me a new set....which is what I am trying to avoid. Can someone please help me out? Any information or even if someone can recognize the make of these pistons would be very appreciated.

I'll try to attach some pictures...(if it works)

thanks in advance..

So-Cal Jack
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Old 08-25-2007, 12:14 PM
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Pistons

Well, I'm no 400 expert but those are CAST pistons to start with, and a dome to boot; easy to see why things are detonating and why the top ring land broke. Sure it's detonation? What's the cylinder ridge look like and what are the bearing clearences? Anyway, Badger/Dynagear makes/made a cast, domed, 400 piston # 400125 ( from the Competition Products catalog ) and they were only $99.99 a set with pins! I can see yours were balanced by the "lightening" done on the inside of the piston head; you'll have to weight match whatever you find to that piston. Good luck.
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Old 08-25-2007, 12:27 PM
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You need to back off on the compression ratio. Burp the wallet for a new set of flat tops (for 76cc heads) or a 18-22cc Dished piston (for 64cc heads) to run correctly on pump gas. Or you'll be tearing it apart and doing the same thing over and over again.
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