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Old 09-14-2003, 10:23 AM
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350 Piston clearence

I am putting a rebuilt 305 Chevy 4 bolt back together, and have a Q on piston clearence. Bored 30 over, flat-top pistons, just how snug or what clearence at top of bore? Any more tips for assembly are appreciated.
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Old 09-14-2003, 12:51 PM
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Was it converted to 4 bolt mains??
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Old 09-14-2003, 05:20 PM
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depends on the type of piston, cast eutectic pistons for hi-perf use only use .001-.0015", cast hyper-eutectic use up to .003", Forged pistons can be anywhere from .001-.008", depending on shirt design and alloy of material, "you gots to know whut you got for pistones".
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Old 09-14-2003, 06:41 PM
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350 pistons

All I know is they are Badger flattop pistons. Nothing fancy as they came with the rebuild kit. I just want to check my machine man's work.
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Old 09-14-2003, 07:47 PM
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Badger flatop cast pistons usually get set from.0005 to .001 stock, for high perf work add about .005 more clearance, beware these pistons are .020 short (as are most rebuilder pistons). So you will have more deck height than is desirable. .040 squish is what to shoot for.
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Old 09-14-2003, 08:03 PM
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Hi Guys,

Bob looks like all the info was dead on but did yo mean add .005 or .0005?

Thanks
Jeff
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Old 09-14-2003, 08:35 PM
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.0005 or 1/2 thousanth of an inch--.005 and the cast piston would rattle so bad it would sound like a deisel.
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Old 09-15-2003, 12:04 PM
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Also, most aftermarket replacement pistons have barrel shaped skirt, so it does matter where you measure the piston. The pistons should have had instructions pointing this out. Try measuring at the middle of the skirt (90 degrees from the pin), approximately in line with the bottom of the pin hole. This area should be the maximum piston diameter.
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