81 head specs

[ResQU]

Is there anyone out there that might know the specs on at set of stock heads on an 81. I would like to know the valve sizes and the combustion chamber volume (cc).

 

[GerryLP]

Is there anyone out there that might know the specs on at set of stock heads on an 81. I would like to know the valve sizes and the combustion chamber volume (cc).

The intake valves are 1.94". The exhaust valves are 1.5". The head casting number is 462624. The chamber size is advertised at 75.54 cc's, but I measured precisely a set of heads for my L81, and I was getting close to 78 cc's. The best way is to cc the heads, pistons, or any other volumes you need. Do not rely on advertised sizes in cubic centimeters to calculate your CR or other numbers.hnoes

GerryLP:cool

 

[ResQU]

Thanks for the info! Might you know the cam profile as well?

 

[JohnZ]

Thanks for the info! Might you know the cam profile as well?

The cam (P/N 3896929, casting #3896930) is the same standard cam used since 1967; 195*/202* duration @ .050", .390"/.410" lift, 116* LSA.