Originally Posted by deerefanatic
Only knocks in the higher rpms

It sounds like you need to adjust the rod bearing clerarance by removing a few shims. Either use a piece of Plastigage to get a clearance of .0015" to .002" or put a .0015" piece of shim stock about 1/4" wide between the rod cap and the crankshaft and adjust the shim thickness until a slight drag is felt as you try to turn the crankshaft. Obviously, remove the checking shim before moving on to the next rod! I've even done a little filing on the rod cap to get the right clearance, if all the shims have been removed already.
Jerry

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