You probably will be fine, the brand x ones are close enough for street use and an occasional 6500 rev or 2. We ran BBC cranes on a late model stock car back in '84 and it ran fine all summer. Back then the Ford and BBC shared the same p/n.
I wouldn't lose a lot of sleep on them as long as the are tracking on the center of the valve stem and you are not bending any push rods ( a problem we did have on that circle track engine- not knowing ny better we just upgraded to 3/8" push rods and guide plates)
good luck
-blizz
btw this is an on topic question and you could copy/paste it to the main forum and I'll just delete this one later
-blizz
Well, I guess to sum it up, you could say, there's three reasons why there's so little crime in Mayberry. There's Andy, and there's me, and [patting gun] baby makes three.
