I suspect that the same tappets may be suitable to adapt to the Gen-2 stovebolt motors (235, 261).
The diameter matches; I don't know if the oil passage is at the same height.
The inter-tappet distance is probably slightly less than the GMC, normally requiring the link bar to be slightly shorter. The Crower makes this difficult since (if I read their description correctly) the bars are permanently attached. Obviously, the bar could be sawed in half, shortened, and welded back together.
The link length is always a loose fit, since it must accommodate the narrowest distance between the attachment buttons: when both the intake and exhaust tappets for 1 cylinder are both at rest (TDC compression stroke). The distance is greatest when only one tappet is at full lift, such as 110° ATDC on intake.
Therefore, the link is made with the B to B "both closed" (smallest) distance pretty close to the actual tappet centerline distance, and the B-B "one open" distance large enough to suit the highest lobe anticipated (.500"?).
Why all the math?
Because the GMC tappet may fit the 235 with no mods at all, if the max 235 lobe is sufficiently smaller than the max GMC lobe.
