It was a high performance application, he needed adjustable valve lash.

He had ordered a custom grind cam and created an interference engine so he tossed a crane 5 in then made an adjustable lash to find the interference point so he could use his custom grind cam without smacking valves.

Guy was preety smart he has a bunch of threads, one of the seldom few to break 200 whp N/A. Actually he hit 219 whp.