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Old 12-20-2009, 10:09 PM
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L-31 compression ratio and piston type?

I bumped into some on-line debate about L-31 CR with 64cc heads and stock pistons and would appreciate some input from the forum. Someone was saying that Chevrolet used two different dish cc's depending on the application - the heavy duty trucks being set up for less CR for some reason. I'm asking because I have a stock L-31 short block salvaged from a 2001 CK2500 (yes they did put some L-31's into 2001 vehicles, although the computer at Auto Zone won't agree). I'm considering the Edlebrock top end kit (E-Tec heads, RPM "Gap" intake, and a cam). Edlebrock claims 400 plus HP on a 9.5:1 350ci. What HP can I expect out of the stock-piston , stock bore and stroke Vortec with this top end kit installed? What will my compression ratio be? Finally, if someone can settle this one - are the stock GM dished pistons used in these late model Vortec engins hypereutetic??

Last edited by Zeeb; 12-21-2009 at 07:09 AM.
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