Re: High compression pistons
Yes, industrial GMC V6's and V12's had high compression pistons when set up for gaseous fuels. I believe the pistons were flat-topped compared to the truck pistons that were slightly dished. 'High Compression' in this case was a relative term, I believe they were only about 8.5 to 1. I always wondered if GMC made a higher compression piston for the 637 gas V-8. That piston had the combustion chamber built into it.
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