[Kube]

Originally Posted by Walt Dupont--Me.

A couple of questions please. I have a set of heads with these no. 81A6049A and 81A6050A--Can someone tell me what engine these came off and what year? NEXT question. The customer wants to use these heads on this Canadan C59A engine that I'm building. We've all figured out that this engine is an early Merc 39-41 or early milartary engine. It's originaly a 3-3/16 bore block but will hold a pencil and block plugs in the pan rail. NOW, can I use these heads without enlarging valve pockets or will I have to enlarge them. I'm going to CC the heads. Does anyone know what these heads should cc? Thanks Walt PS- witch is right and left head? Thanks again? Walt

Alan is correct that the valve chamber will need to be flycut for any 59 series engine. And, as he advises, the heads you have are 1938 / early 39.