6066 (1960-1966) GMC Truck Club

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Cool, thanks. The truck was originally a 327 V8 then converted later on. Do you know what that plug is for?

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Cool, I know it was a 327 V8, then swapped to a 250 I6 afterwards. I still want to figure out about the hole, though I really need to find a better plug for it and fix all the random loose stuff. Thanks for the info!

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My phone is jacking up, not sure if any of my previous posts went through or not, but I'll check in tomorrow and fix anything that is messed up.

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Quote:

Originally Posted by Hantke (Post 56264)

ever use that royal purple oil treatment? its supposed to help with low compression and high mileage engines. I'm thinking about giving it a shot when I replace the oil.

Hantke,

Marvel Mystery Oil is a common additive for low compression issues. Many members report good results from it. If memory serves it is around $24.00 per gallon at major Wal-Mart supercenters.

-Jeannie

6066 GMC Club

Quote:

Originally Posted by Hantke (Post 56270)

Cool, thanks. The truck was originally a 327 V8 then converted later on. Do you know what that plug is for?

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You mean the plug on the side of the valve cover? That was used for the hose and pipe that ran into the air cleaner, basically the breather for a closed ventilation system. It would be a good Idea to route one up to make it complete before you blow out a main seal.

That's good to know, I know it will fall out if you so much as look at it funny right now. Would it be OK to put one of those little breather filters on it? I don't have an air filter yet, so I can't hook it to that yet.

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In respect to your head lite's have you tried replacing the dimer switch. I had the same problem on my '72 GMC dump truck and that's what it turned out to be. Ross Durham, NC '66 GMC with '12 flat bed, '72 GMC dump.

It turns out the headlights were shot, I replaced them both and they both work fine now. I'm lucky that was the issue, because my multi meter just broke!

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So I finished the rebuild today, and WOOOOOHOOOOO it started with the first turn of the key! But now it's definitely leaking gas and I'm not sure if it's the carb gasket or if it's the new fuel filter. The carb doesn't back fire, but when I turn it off it does smoke for a couple minutes.

The whole carb and obvious wet spot (all gas)

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The wet gasket (wet along the edges)

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Before the fuel filter was just screwed in, so I removed it and added a rubber gasket (neoprene) in between, and it still leaked! I'm not sure where it's coming from and I don't think it would be the gasket, though it's a definite possibility. I'm going to re-adjust the floats to sit lower in the bowl and see if that fixes it, if not, I'm lost.

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Do you have someone that can jump in and start it tomorrow after it's all dried out? That way you could watch and see where it starts.