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Old 11-26-2005, 11:41 AM
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Piston Identification. Please Help!

Can anyone help identify my Pistons? These are currently installed in a 350cid Small-Block Chevy.

Pistons have four valve-reliefs and appear to have milling marks from the manufaturer. Only markings are ".060" on top.

I'm looking for an approximate compression ratio with 64cc heads using these pistons.

Attached file is picture installed in Engine.

Help!
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Old 11-26-2005, 11:44 AM
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Depending on gasket thickness and deck clearance, 8.75 to 9 to 1.

tom
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Old 11-26-2005, 08:32 PM
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ID Help

This engine originally had 76cc Heads. I bent an Intake Valve when the Rocker jammed.

If the Compression Ratio with 64cc Heads is 8.75-9:1, then I must have had really low compression with the 76cc Heads.

Is it possible that these are higher compression Pistons than the first posted reply?
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Old 11-26-2005, 10:48 PM
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No offense. Those are really crude looking "rebuilder quality" looking cast pistons. In addition to the deep dish and crude cast valve reliefs they probably also have a shorter pin to top distance for reduced compression as is common with rebuilder stuff.

They are definitely cast low rpm stuff, and not performance pieces at all.

Since they are already in the holes, measure from the deck to the bottom of the dish, and the depth of the dish itself. Then maybe we can guess for you. I would think that you need as small a head as you can find.

Last edited by xntrik; 11-26-2005 at 11:06 PM.
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Old 11-27-2005, 07:40 AM
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Quote:
Originally Posted by xntrik
No offense. Those are really crude looking "rebuilder quality" looking cast pistons. In addition to the deep dish and crude cast valve reliefs they probably also have a shorter pin to top distance for reduced compression as is common with rebuilder stuff.

They are definitely cast low rpm stuff, and not performance pieces at all.

Since they are already in the holes, measure from the deck to the bottom of the dish, and the depth of the dish itself. Then maybe we can guess for you. I would think that you need as small a head as you can find.
I wasn't going to mention it but 'xntrik' is right, I wouldn't push that motor too hard, those are pretty crude looking pistons. I bought a set of cheapo Sealed Power cast pistons in that configuration for less than $60 with rings and they at least had a nice machined top. If it was me I'd be looking at replacing those with at least some hypereutectics if you plan to beat on it at all. But that's just my opinion.
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Old 11-28-2005, 10:14 AM
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Help id-ing SBC pistons ~ Thank you

Many thanks to all those who responded to my request for help in id-ing the pistons in my brother-in-law's SBC. Looks like something else will be added to his Christmas list.

Daren
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