Good news. I just got off the phone with my local head pro and he's going to jet blast my heads for $10. Score!!! I'll have him take a quick peek at the mating surface and make sure it's flat and true.Scottie
Looking nice and clean there, Scottie. BTW, you probably have approx. 715 cc there, the [736cc] 750's ran a 93 mm stroke as well as a 71 mm bore. B.W.
The 692cc (700) had 5/16 studs to hold the heads & barrels down. George Helms and several other racers used to replace the 5/16" studs with the 736cc (750) studs that were 3/8" diameter. He also used the Interceptor tube nuts to hold everything together but the 700 tube nuts can also be modified to fit 3/8" if necessary. Blown head gaskets have always been a problem on the RE big twins. It would have been less a problem if they had made castings in one piece for the twin cylinders instead of separate castings. The parts started out 500cc then ended up 692cc with high compression pistons and cams to boot so the original design was pushed to the limits of power output. The 736cc Interceptor stuff was the strongest of all the RE big twins. For folks that just put around town, it's usually not a problem but racing is a different story alltogether.When I surface my heads, I put sheets of silicon carbide paper on a surface plate with a bit of oil and lap the heads till the warpage is just gone. I don't trust too many machines on those little castings plus I only remove just what is needed to get the job done and no more.