Place your mouse cursor over the desired model year to determine engine specifications for that year. Only 1968 & 1972-1974 have any information currently.
1968 1969 1970 1971 1972 1973 1974 1975 1976

Generic Specs

Firing order: 1-8-4-3-6-5-7-2
Bore spacing: 4.75
Deck height: 9.175 (66-69) 9.208 (70-up)
Crank Journal Main 2.7472
Rod Journal 2.0944 or 2.2481 (390 & 401)