I purchased a 350 crate engine with 202 heads this motor was fresh but set in my garage for several months before installing - I cranked it on a regular basis - I had a motor stand set up with a radiator - After finally installing in my 49 ford it has been running like crap - When it warms up it starts tapping on one of the lifters - We already set the lifters after warming the engine and still taps and bangs out after it warms up - The comp mild cam was new when engine was done - This was a oreilly crate engine and the person i bought it from had the 202 heads done for the motor and installed the comp cam ..