Re: 1964 GMC Model 1002 build journal
 

Yes, semi gloss black for the heater box.

Re: 1964 GMC Model 1002 build journal
 

Thank you sir, for your info.

Re: 1964 GMC Model 1002 build journal
 

I used an H valve (see attachment) to maintain the flow to and from the engine. I am not sure, but I believe the OEM left it flowing all the time to allow heated coolant to reach the thermostat in a timely manner. It is vacuum operated off (remove vacuum to turn it on) and I have not created a mean to control it in the cab yet.

Re: 1964 GMC Model 1002 build journal
 

Interesting James, I will have to look into a way to control the water flow, I might just keep it simple and have a manual valve I can turn off in the summer. I'll see what I have stashed around.

I managed to get the entire heating assembly off and the fan motor is toasted, and the heater core was original to the truck and evidence of a leaky core. So I ordered another core from the Filling Station, decided to modify the heater box to accommodate the larger heater core, mine is the airflow thrift heater and has a 7-1/8" long heater core, went to the full size core which measures a full 9-1/2". So it is roughly 25% larger. The Filling station cores are a full 2.5" thick like the originals, some of the other vendors sell a 1.5" thick core and you have to modify the mount to secure it to the box, plus it is effectively 1/2 of what these are in heating surface. Interesting enough, the mounting plate for the core is stenciled to be cut out for the larger core, it literally took less than 5 minutes to make the change. I'm glad I did, this heater works great blows hard and hot.

Here are a couple pictures of the heater box parts after I glass beaded, painted and assembled.

Now onto a new set of valve cover gaskets to cure an oil leak on the passenger side.

Re: 1964 GMC Model 1002 build journal
 

Hello all, been busy in the shop finishing up an engine R&R for a friend that is going in his 52 Chevy truck, so my 64 GMC project has sat.
But now have a little to report. I decided to add a power brake booster to my brake system, I'm still keeping it all drums but I did update to a dual master cylinder. I figure it will compliment the factory power steering and is one of those options that will be enjoyed and one of the few that will actually make the truck more valuable and easier to resell, if ever the time comes, which I doubt. There are lots of kits available but I did not want to drill any holes in my firewall and wanted it to fit and work like the factory. Finding a correct 1964 power brake booster is getting hard and then would be looking to rebuild it so I ordered a booster from rock auto for a 1967 GMC and purchased a really nice engineered spacer/adaptor from the Captain on the 67-72 chev. truck forum. It does require a little fab work on the push rod but that is working out easy enough.

Also made my day, I scored a set of .020 under main bearings for the 305 on fleabay, I have been looking for months.

Re: 1964 GMC Model 1002 build journal
 

Don't forget to drill a new hole in the brake pedal lever. It should be moved down 1", otherwise the brake will be touchie. Or use an OEM brake pedal lever that is used with power brake.

This is what I had found on the Internet. See attached document for everything about brake system.

Re: 1964 GMC Model 1002 build journal
 

Thank James, will read the doc. file.
Appreciate your comments and help greatly.
Steve

Re: 1964 GMC Model 1002 build journal
 

Today is the official beginning of the cab off restoration. Got the cut off wheel out and a sawsall and started in on the bed disassembly. Removing the bed was a snap utilizing the lift and some support straps from the rafters. Had enough for the day today with the cleanup, back out after it tomorrow. Looks like the original color was green.
Thanks for watching.
Steve

Re: 1964 GMC Model 1002 build journal
 

Great work you're doing, very quick and efficient! Will be watching. Interesting tropical looking tree there.

Re: 1964 GMC Model 1002 build journal
 

Thanks Snazzy, I am doing this one a little different from my 53. I'm going through the rear frame area, differential and box first.

The tree is a palm tree and it is growing like a weed, go figure with all the rain we get in the pacific northwest but we dont get a heavy freeze here and that is the key, I think. On the other side of the yard I have a giant redwood growing, I planted it 35 years ago and it is 100' already and almost 6' through the base, you can see that in the same picture.