Originally Posted by Uberpube
Timely thread, what exactly is the spec for b engine lfter bores? It looks like I'll have get mine bushed, spec is .0015-0017 clearance at 70f some of mine are measuring 0.0025 to 0.003 clearance at 60f.


At least .0015" to .002" at the most is where you need to be, any more than .002" and you have 16 leaks in the same circuit as the main and rod bearings, not good.

Very important to verify lifter clearance, but seems to get ignored as long as they fall in.