Means that as you look at the top of the piston, there are no little "1/2
moons" cut into them, but are a flat surface. Some need valve reliefs for
high-lift/high duration cam profiles and/or high compression, other's swear
the reliefs promote swirl in the chamber. 4-vale relief pistoms usually
add about 4cc?? IIRC to the combustion chamber volume.
> [Original Message]
> From: James Collins <jxc7@psu.edu>
> To: <oletrucks@autox.team.net>
> Date: 4/15/02 7:23:13 PM
> Subject: [oletrucks] Pistons
>
> Can anyone explain what the discription "Flat top with no valve
> reliefs" means in reference to pistons. This was from a sale of a
> "Set of 6 Chevy 235 +.030 TRW Powerforged pistons with pins. Flat top
> with no valve reliefs. 3/32, 3/32, 3/16 ring grooves."
>
>
> Shamus
> 1950 3100
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
--- Mike
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