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update on broken head bolt-42 'D'

D

dick benson

Member
Used a punch and chisle to chip away old stud from threads enough to get an tap started. A little more drilling and tapping with hammer and I managed to get the tap all the way through to clean up the threads. Now I need to find a stud. I have some old studs out of a 6cyl 500 that might work? Anyone just use a bolt if you can't find a stud? Dick, OR.
 
Trust me, don't fool with bolts. Get, make, or have a replacement stud custom made. With a stud, you are sure of the torque since there is no chance of bottoming out or binding in the threaded hole in the block. This is true both when first installing the head and when re-torqueing the head.
 
Christopher: I have new, custom made Studs on the shelf, but here is a question. If Bolts are inferior, why would CASE switch to Bolts, on the Racine engines, in 1960, and continue with them?
 
I don't know exactly why. The reason may be strength of the bolt vs. an equivalent stud and nut, or cost, or simplicity, or ease of installation. I do know several advantages that studs give for installation and service.
1) They hold the head gasket and head in proper position during installation. This prevents damage to the head gasket while manipulating the head into position.
2) They insure proper torqueing and re-torqueing since you can readily observe that the nut is not bottomed out on the stud (as compared to the threads on the end of a bolt, which are hidden in the block).
 
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