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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 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | I have a 350' chevy 4 bolt main block with 2 sets of caps. Bothe sets are numbered 2,3 and 4 but I am sure you already know my question. I have cleaned up the block and bothe sets of caps. I have installed bothe sets separately. I don't ever remember having to tap them in with a medium sized hammer, so how do I determine what set is going to work? My smart _ _ _ buddy's said to toss a coin heads or tails? These caps were wired separately in a wooden box, I can't remember how long I have had the 350, I am sure the early 70's. | | | | | Joined: Feb 2004 Posts: 29,809 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,809 | Unless they were original equipment to the engine, they will probably have to be line bored to fit the block. Finding an alleged "machinist" willing to do the job will be the biggest problem.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2022 Posts: 116 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 116 | Hotrod, what about the light tapping with a hammer to seat the caps in the block? | | | | | Joined: Feb 2004 Posts: 29,809 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,809 | That's normal- - - -they're supposed to be a snug fit. It keeps the cap from shifting sideways, and keeps the bored hole perfectly round. Now, if it takes a medium velocity swing with a BFH, that's what we call "too tight!" You can chamfer the corners of the block and/or the cap VERY slightly with a file to help guide it into place. The aftermarket 4 bolt caps I used to install on 2-bolt race engines were intentionally made a few thousandths too wide to compensate for manufacturing tolerances between blocks, and had to be file-fitted, then line bored.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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