Valvetrain noise - Magnum headed LA 360

My heads on my magnum/LA hybred are not decked but the block was machined about 0.020" to get the pistons to zero deck and I have a 0.039" thick head gasket.

The threads on the bolts holding on the magnum rockers are 5/16-18 which is 0.055" per revolution of the bolt. When I put mine together from the point that there was no clearance to the point the pedastels bottomed on the head was about 1/2 a turn or about 0.027" of preload on the lifter.

If I had not decked the heads I would have had about 0.007" of preload. I have heard people report that the conversion pushrods are too short so depending on your parts you may not have enough preload. i would pull a valve cover and check a few.