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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2012 Posts: 11 New Guy | | New Guy Joined: Feb 2012 Posts: 11 | I have a 1961 Chevy C-10 LWB Step-side. When I purchased it, it came with the original engine. When I purchased it, I took some steps to restore it to driving condition after sitting idle for at least 10-15 years. After a few months of "overzealous" driving, it spun a main bearing in the heat of a July day. This was 3 years ago. A year and a half ago, I purchased a Craigslist engine of the same displacement (235cid) from 1957. Unfortunately, although it runs great, it has a slight knock at idle when warm. I'm trying to figure out if this could be silenced or quieted by a change in oil viscosity. I have noticed that STP helps a little bit, but it seems that when the oil is hot it begins to knock. Does anyone have any ideas on a good quality oil to use to relieve this problem, or any suggested additives?
Again, this knock occurs intermittently when idling and warm. Under load, it does not knock. Any help appreciated. Thanks! | | | | | Joined: Apr 2012 Posts: 135 Shop Shark | | Shop Shark Joined: Apr 2012 Posts: 135 | You should find the source of the knock. Thicker oil may make it quieter, but it's not going to help the knock
| | | | | Joined: Oct 2006 Posts: 1,847 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 1,847 | simply put, no. Oil will not repair metal. Generally speaking once an engine starts knocking it is on its way out. | | |
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