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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | A drilled head bolt is not used originally, it is only used when putting a 1958 or earlier rockers on a 1959-62 engine to slow down the oil flow.
There can be a number of causes for low oil flow to the rockers.
There can be slug build up in the supply path, or the rockers them self can become worn enough to block the oil hole on the shaft.
I would start with disassembling the rockers and looking at the shafts and rockers for wear.
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