Put you standard digital calipers in the bore fully open and the zero the calipers. Then without re-zeroing the caliper measure outside edge to outside edge. That is your center to center measurement.
Originally Posted by JW51
Anyone happen to know, or have a convenient way to measure, what the center to center measurement is for lifter bores on a 235?

Given the wide array of roller cam conversion kits available nowadays, I got to thinking maybe there was a spacing match with a common V8 application.

If so, a guy could buy off-the-shelf conversion “tie-bar” roller lifters, have the 235 lifter bores sleeved to fit them, and get a roller cam ground. Pretty minimal amount of custom or complex or expensive machine work.

Old enough to know better, too young to resist.