I'm using TLowes 1.75 rockers. My turbo cam is fairly mild with .544 lift but even at that at full lift there was clearance problems at the top of the push rod hole. The push rods are 3/8 and I opened the holes up to 5/8. Still had to take a die grinder to the tops of the holes. Also the bottoms had to be relieved about 3.5 inches under the head. TLowes rockers are for a BBC. Usually if theres a 409 anywhere on the box the price goes up.
