Stock 49, after reading the lifter thread the set of lifters out of the original 248 are your "unknowwn" style in addition to 8 of the lifters I just pulled from the cast cam 302.
The 'unknown' set from my post were pulled from my '49 216 and were running on a steel camshaft - suggesting chilled iron construction. They are not worn suggesting cam-lobe and lifter face are compatible. The absence of holes (top or sides) is most curious. No idea who manufactured them or when . . .
