Ray, did you also measure venture chamber volume?
No, I did not.  It was not relevant to me as I was installing Max heads on a 1300 Venture motor.  I calculated that this combination resulted in about a 9.0:1 compression ratio.  Incidentally, visually the Max and the Venture heads look very similar despite different valve sizes.
also pin placement in piston?
I had a Max piston and a friend had the pistons out of a Venture motor.  We compared (over the internet) piston pin heights and they were the same.
also vmax cams have larger overlap than the ventures.
You bet they do.  The Venture cams have very steep ramps and pointed peak compared to the Max cams.  No clearance problems between Max valves and Venture pistons, even though the Venture piston valve reliefs are a bit shallower than the Max's.  The overlap will have an effect upon true compression ratio.  When I measured my combustion chambers I was expecting a higher number than 10.5:1, the advertised compression ratio.
 
Regards,
Rey Kirkman
VMOA 439
Tyler Pennock, # 380
V max Owners Association
Eastern-Canada Director
1987 V max 1260
Ottawa,ON,Canada
<[EMAIL PROTECTED]>

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