The head is an aluminum Knudsen, originally 7.7 to 1. When I bought it, the PO had taken it off a '48 engine with head studs. He used a hammer and screwdriver. I had it milled after it was welded up. The machinist guesses it at about 8.25 to 1. FYI, Norfleet Cams in Dallas, TX can regrind your stock cam to an Isky 400 Jr. grind.
I'd sure like to find one for my 51.
BTW,Delta Cams in the nortwest (they have a web page) also grinds cams to any specs you give them,as well as weld up and regrind your stock cams,solid lifters,and cranks.
I have put 3 of their cams in various engines I have owned,and they all worked good. The cheapest cam I could find for my 1953 Ford tractor was $300,used. This was over 10 years ago,but I bought a reground came from Delta for $39.95 plus shipping and core charge.
