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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 | Tim, you use this bolt when a 1959-62 block ,which has an 11/32" orifice for the rocker oiling control (Through 1958 it is 1/16") is used with any 1958 or earlier rocker setup. This bolt which has a 1/16" hole in it restricts the flow to match the 1958 and earlier rockers that had the groove centered inside the rockers (not offset like 1959-62).
Note in parts book: Use with drilled bolt.
Plug # 3764579
Install in block oil port near right center head bolt.
(This plug blocks the original oil path and sends it through the drilled head bolt)
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