I use a Rod Bloomer 4.250 crank in my old x block. Its worked well. I dont use a standard style pick up.Thats where a big problem is. I have a Kevco pan with arear pick up.It cleared everything with minimal work. On my Molnar 4.125 crank it helped to cut the front and rear counter weight about .300. Using comp star rods and JE pistons it balanced very easy. The 4.250 x 4.125 x block has been 5.66 at about 121. I dont spin it very high, I shiift it about 65-6600

If this web site werent so difficult some older members might stop in more often. I havent been here in quite some time.