In 1966 the @98 head had a chamber size from 52.0 to 55.0 this works out to be about 10 to 10 1/2 to one.
Valve sizes are exhast 1.45 and intake is 1.78
port sizes are intake port 1.04 x 1.94
exhast port size is .96 x 1.24
And uses conventional rockers.
Hope this helps,
sorry it took so long to answer but I just got back from work.


~ Vegas ~