You've been mostly-dead all day.
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GS850, stock bore for a 378 swap, is 69mm. That's all I see wrong. Unless we're running aftermarket overbore pistons.
Thanks. My next question would have been is it something to worry about’?.So long as you're not pinging, high compression would be a good thing. Harder to kick over, sure, but a stronger engine is something for which people usually pay extra.
Thanks for the help. I guess like Sonreir said, if it’s not going to blow up the engine, it’s all gravy.Sonrier: Agreed. Higher CR makes for better street performance as long as the fuel octane level is high enough.
At least you have a real number now to confirm that the compression is quite high
Let's assume you would like to reduce cranking pressure from 195 (nominally 13.2:1) to say 180psi or 12.2:1, that would require an increase in clearance volume from 15.5cc to 16.8cc which is an increase of 1.3cc and with a 70mm bore that amounts to around 14thou (0.014") spacer or a gasket .013-.015" thicker than you have now.
Somebody should check those calculation though.