by kitabel

Missing from this advice: the first time either piston approaches TDC the dome will crash the head, and a valve may strike the dome.
Because the panhead barrels are .200" shorter than knucklehead (5.33" vs. 5.53"), which reduces your piston to head clearance by .200".


What to do?
Insert a 3/16" stroker plate and an extra gasket to get the math back to nearly stock.