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#26 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,622
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Re: Old Man Truck - 1967 C20
I've had very good luck with Valvoline VR1 SAE 30 weight Racing oil. Oil was changed every 2,000 - 2,500 miles. I ran one 292 engine on that for 250,000 miles in 25 years -- gradually working up to 50 weight by the last few years. When I rebuilt, I went back to 30 weight racing oil. In winter, especially if leaving the desert for the mountains [I was a ski addict] I used Valvoline 20W-50. If not running VR1, [since I found out about it], I add a bottle of STP for the ZDDP content. Not necessary with Valvoline Racing, as it has enough zinc, and too much is corrosive. Zinc has been gradually phased out of motor oils since its deleterious to platinum in catalytic converters. This vintage has no cats, but we need the ZDDP to prevent cam lobes from wiping out on hydraulic lifters.
I use Wix filters, now, p/n 51060. I used to use Fram or AC PF-35. That's the long filter. I have used other brands, Chevron, Shell, Castrol, but I prefer Valvoline Racing. For a while you couldn't get it.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#27 |
Registered User
![]() Join Date: Mar 2013
Location: Syracuse, Utah
Posts: 499
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Re: Old Man Truck - 1967 C20
Really dig your truck man.
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Justin '67 C20 CST Custom Camper '04.5 LLY Duramax CCSB...sold |
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#28 | |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,399
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Re: Old Man Truck - 1967 C20
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#29 |
Registered User
Join Date: Jun 2016
Location: Central California
Posts: 229
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Re: Old Man Truck - 1967 C20
Finally had a chance to put a few miles on the truck this weekend. It ran surprisingly well - good power pulling a grade up in the mountains, good oil pressure, no smoke.
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1969 GMC K2500 Last edited by bhayes1; 01-29-2018 at 10:50 AM. |
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#30 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Old Man Truck - 1967 C20
No need to do anything but drive it. That truck is cool as is. You can do little things if you want when you want, but that truck is great as is. If you wanted a disc brake V8 C/10 I reckon you could have bought one of those instead. A real truck guy knows the 292 under the hood is a cool boast.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#31 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,622
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Re: Old Man Truck - 1967 C20
L6s tend to tick a bit, especially warming up. 292 more so. If it bothers you, check your oil level, pull a compression check, even adjust valves... but they have different operating characteristics than a V8.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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