[Barry_R]

Yea - - those are standard wisth Doves. We at Speed-Pro buy them from Dove, and that's why I used them. I've only broken two in about a decade of racing and cruising with 700 lb springs - - both on one cylinder when I snuffed a head gasket. We did have a couple cracked ones upon teardown of my prior motor though - - I think my valvetrain geometry was not correct - - actually it "pulled a significant vacuum". Its fixed on this engine, and I'm hoping things stay OK.