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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: Apr 2013 Posts: 144 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 144 | 1959 235 engine, why does it have 2 threaded holes on passenger side that enter oil galley? I'd installed a motor and didn't recognize what the holes were for (nothing was in them) and I figured they were to hold a coil bracket. Imagine my surprise when I started putting oil in the engine and these 2 holes began weeping oil! Afterwards I had to wonder, what are they for, the remote oil filter cannister things are always on driver side of engine, these holes on opposite side? Just curious why they are there??? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | lefty1,
Can you post a link to a photo of that side of the engine?
People will speculate about what you are referring-to, but you'll get more useful/helpful answers if you can link to a photo.
In the top middle of the passenger-side of the head is a hole and a plug (normally, a plug). People sometimes remove the plug and attach a line from an oil filter fitting on the driver's side of the block (a jury-rig solution to minimal oil reaching the rocker arms).
| | | | | Joined: Feb 2004 Posts: 29,740 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,740 | The bolt holes where the coil bracket mounts do penetrate through into the area where oil drains back to the crankcase. If bolts aren't in those holes a small leak can happen on occasion. It isn't pressurized oil, just gravity flow back to the oil pan. Either bolt the coil where it belongs or just plug up the holes with short bolts.
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 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | A picture please. Holes in the head covered above. Holes in the block? Cover? where are the holes?
Steve H
| | | | | Joined: Apr 2003 Posts: 608 Shop Shark | | Shop Shark Joined: Apr 2003 Posts: 608 | Steve H
Jerry nailed it.
But a pic is worth a thousand words.
Those are the drilled and tapped holes for the coil bracket.
regards,
steve sr. | | | | | Joined: Apr 2010 Posts: 362 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 362 | There are two holes low just above the oil pan on the passenger side which go all the way through to the crankcase. they are for holding the sheet metal piece with a sort of filter which is where the draft tube comes out. If you don't put bolts back in it will leak while the engine is running and drive you crazy looking for a leak. Larry
58 gmc 100 with 350 sbc
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