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September 26, 2021, 08:42:22 PM by Dave78 | Views: 36 | Comments: 0

I have an 81 k20 with a 350 and heavy duty cooling rpo. It has a weird issue I've been unable to troubleshoot and fix.

When it starts from a cold engine, it will heat up to 220-240 degrees within 5 minutes or so if I don't let it idle up to temperature. Then it will sit there for a while (10 miles or so) until it suddenly jumps down to 180 or so. If I let it warm up from idle it will never get over 180 and will stay that way no matter if it's 40 degrees or 100 outside. The colder the ambient temperature, the hotter it will spike to. I've verified the external temps with a laser temp gun. The heads temps are accurate with the coolant gauge.

I'm running one of those high flow thermostats with 2 1/16" holes drilled in it and 180 degrees. 50/50 antifreeze, fan shroud, slightly rich, pretty much stock engine. My heater hose runs from the intake manifold to the heater core and then to the top of radiator. Water pump isn't weeping. No bubbling in coolant. No puking or steam and I have a new rad cap and overflow tank. Not losing any coolant either. I ran a 195 standard style thermostat in it for a while but it was in the late winter/early spring so I let it idle up to temp before I drove it and so the issue was never really a problem. In the summer though when I wouldn't let it heat up before driving I'd notice the coolant gauge would hit 250 or so before it would drop to 190-200. Can't quite figure out what the issue is with it. The temp sending unit is in the driver side head between cylinders 1 and 3. I'm guessing it's not really that big of an issue but it still bugs me nonetheless.

The two pictures are of the temp once it has heated up and dropped and the other as it spikes.
September 26, 2021, 08:17:36 PM by Dave78 | Views: 38 | Comments: 0

I'm going to be needing some new tires for an 81 k20 soon because of dryrot and I'd like to go with the deestone d503 or similar skinny military type tires. I however live in North Idaho and occasionally venture in the mountains and might be buying a house off of maintained roadways before the tires wear out.

The question is would I have clearance issues running chains on that size tire? I currently have 31's on it and would like to go to 35's because it's geared 4.10 but I know I'll need a lift. With the sagging front end I'll probably need a lift for 33's if I go off road any amount and possibly spacers with chains. I'm thinking of cheaping out on a taller skinny tire and calling it good and still be able to chain. Just curious if anyone has tried this. I'm also eating off the outside of my front tires, I just rotated them and as you can see in the picture, it's eating them up pretty bad. I'm thinking too much to toe in.

LILT77
September 22, 2021, 01:41:33 PM by LILT77
Views: 134 | Comments: 1

Anyone have any luck with any aftermarket options for the D49 style sport mirrors? Finding a good original set appears to be a pain. I've heard mixed things about the aftermarket options available such as becoming loose and really don't want to order junk from THAT place.
September 21, 2021, 12:02:17 PM by Cheyenne1010 | Views: 172 | Comments: 2

I have a 1973 Cheyenne 350 engine stock.i need help with finding valve stem seals,when I say help with finding them,there are so many to choose from now a days.so any help will be greatly appreciated,thank you.
September 21, 2021, 10:46:28 AM by smblocksteve | Views: 129 | Comments: 1

   Hi Guys,
 I haven't be on the post's for a long time, I have a 78 C20 reg cab and I need some help with the cab mounts. If you'll could tell me how to post pic's that would be great. Where is the best place
posts on the cab mounts?
 
    Thank You smblocksteve
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