W2’s were produced for quite a few years, and there are a few “generations” of them.
At least one generation is fairly known to be crack prone on the exterior of the head by the outer head bolt holes.
The subsequent generation had vertical “ribs” added to the castings in that area, to specifically address that problem.
And I was blessed enough to have this crack prone head. Knowing that I ported them to slightly over 300 cfm with the stock 3/8 stem 2.02. valves. They leaked shortly after and cracked after running a best of 9.82 on BP93 pump gas. After that I sold off two sets of econo rockers and a W2 Victor intake I ported.
