Visually tell type of piston - Team Camaro Tech
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post #1 of 4 (permalink) Old Jan 31st, 08, 08:51 AM Thread Starter
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Visually tell type of piston

I puchased a car that has a 402 in it. If I pull the heads off, is there a way I can tell if the motor has forged pistons?

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post #2 of 4 (permalink) Old Jan 31st, 08, 09:15 AM
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Re: Visually tell type of piston

theyll look forged or cast.

not being a smarta$$, if the piston looks porous(sp) its cast.

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post #3 of 4 (permalink) Old Jan 31st, 08, 10:35 AM
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Re: Visually tell type of piston

I am pretty sure most of the 402s had forged pistons.

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post #4 of 4 (permalink) Old Jan 31st, 08, 10:58 AM
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Wink Re: Visually tell type of piston

Quote:
Originally Posted by satanismymotor View Post
I am pretty sure most of the 402s had forged pistons.
Nope

All 4.094/4.125" Bore 396's/402's in factory confiqurations under 375HP (or "HP" as designated by GM) used Cast Alloy Alum., w/steel expansion ring, pressed-pin pistons up to 1971.
All the HP 375+ engines used Forged, in both pressed-pin and full-floating pin styles depending on piston type, from the factory.
All 402's from 1972 on used cast pistons, no more HP confiqurations were offered.

All 302's were forged though

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Some trucks
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Other V8 things - some of which float
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Other V6 things - none of which float
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Oh yeah, and 1 "Straight-Six" ...
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