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increasing compression

B

bberry

Member
How would I go about trying to drastically increasing my compression ratio on my 770
I'm looking at maybe boring it out for the pistons used I a gm vortec 5.3 as the bore is
similar to the 3.75 over bore kit. I'm trying to find the pin diameter for each as well as
piston height from pin to top. I know there is a possibility to taking a .100 off the head
too. The gm piston is around 9.5-1 compression. That's my target is 9 or 9.5
 
   When you increase the bore in an engine the compression ratio increases.   When the piston is at bottom dead center the increased bore has enlarged the volume, however the combustion chamber at top dead center remained the same, thus increased compression ratio.

   Gasket thickness (look at how many different thickness gaskets were available for crankcase to block and head gaskets were available for an Minneapolis Moline engine).   Valve depth in head will also effect the ratio.
 
When you asked about the compression ration of the G-M and the Oliver piston do you know or have you cc the volume of the combustion chamber of both the G-M and the Oliver combustion chamber? They need to be identical for the question you asked.
 
put a set of these in it from Extreme tractor parts.com , they're 10.5 to 1
a196184.jpg
 
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