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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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#61026 05/29/2006 4:20 AM | Joined: Jan 2006 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2006 Posts: 23 | Did Chevrolet use the special headbolt in #1 position on the '54
engine?
The special bolt with a hole on one end and one in the side? Sometimes
it
had a groove. When did they start using it? | | |
#61027 05/29/2006 7:44 PM | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | Drilled 235-261 Head bolt
From 1938-62, only two head bolt part numbers are listed for 216, 235 and 261. Long and short except for a special drilled bolt, used when a 59-62 block is used with earlier top end* to reduce the oil flow to the rockers.
Note: Use with drilled bolt
Plug # 37 64 579
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)
* The cylinder head did not change but the rockers did.
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