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Old December 8th, 2021, 05:24 PM
James James is offline
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Join Date: Jun 2013
Location: Greer, SC
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Default Re: The fuel efficient GMC V6

Quote:
Originally Posted by Prowbar View Post
Thanks James. What would the compression ratio be after you've performed the modifications? How much displacement do you gain?

Looking at a picture, indeed, those valves are shrouded pretty bad. Should be better on the larger bore engines, if they have larger chambers?

Custom pistons are expensive, but do you see any gains in my idea? Maybe it is possible to modify a standard piston by machining to up the compression and reduce friction.
After all of the modifications, compression ratio would be around 8.75 (stock is 7.5:1). Displacement should be around 310 ci.

Gains and expenses in your idea, with custom made parts anything possible.
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