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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: Jun 2015 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2015 Posts: 59 | I disassembled my engine for rebuilding and removed the oil pump mount from the block,some people say the block is now no good,since it was factory aligned.but I also talked to a local rebuild shop that also removed this adapter while rebuilding a 261, it's been running since 2003, your thoughts?
1962 GMC 920 step side 261 4 spd
| | | | | Joined: Jan 2015 Posts: 914 'Bolter | | 'Bolter Joined: Jan 2015 Posts: 914 | I have not worked much on these engines. Though I can not visualize how you would of harmed your engine. Though I an sure those in the know will respond. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | As long as you use the original shouldered bolts you will be okay.
I would put the oil pump and distributor in place while tightening the shouldered bolts to make sure everything is lined up.
I have needed to do this in the past and it is still working fine.
To reuse the original bolts grind six sides in the head to except a socket.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Feb 2004 Posts: 29,774 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,774 | It's also possible to drill a hole in the bolt head and use a cutoff Allen wrench and a BFH to form a six-sided socket. Use a Vise Grip to hold the Allen wrench and form the hex with one hard blow. A 1/4" drill bit and the same size hex wrench should work about right. I'd suggest machining a close-fitting alignment shaft that fits the block and the oil pump mount to keep it in place while re-bolting it.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jun 2015 Posts: 59 Wrench Fetcher | | Wrench Fetcher Joined: Jun 2015 Posts: 59 | Thanks guys ,spent some time worrying about this,I did think about each of those ideas, machining a shaft to fit , and also assembling the distributor,oil pump and adapter,but also installing the cam and giving it a spin to align things up.the block is in the machine shop getting a sleeve,due to catastrophic piston failure.this is my first old engine I've been in to,I am a HD diesel mechanic and I thought this would be easy. There will be no rushing this repair.
1962 GMC 920 step side 261 4 spd
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