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PostPosted: Sat Jul 15, 2017 4:05 pm 
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LUVTruck.com Guru

Joined: Tue Dec 11, 2007 9:20 pm
Posts: 171
Location: Phoenix Arizona
Hi guys. Wanted to let you know that I could not find the correct freeze plug for my '77 intake manifold. There are two plugs that are a few inches below the carb that are securing the water jacket flow for the carburetor heat. I checked many places and none have a listing for a plug in the manifold. The 3/4 brass plugs were too small and a CARQUEST 20mm steel was too big. I tried on line and O'Reillys Napa, Advance Auto and others. No luck. So I fixed the problem by taking a Napa 3/4 brass cup and 'stretching' it out. It is a product that was made by stamping to begin with so I figured I could just re-stamp it. It worked!! I just used various size 1/4 and 3/8 sockets. I secured the cup and pounded the sockets in graduated sizes into it until I had an outside diameter of .830 + - . Finally, I doped it up with red RTV and installed it and it fit great. The installation path is through the wheel well next to the right tire. I used an extra long (about 24") 3/8 drive extension with a snug fitting socket on the end. Set it up all square and with a couple of whacks it was done. By going through the wheel well it is a direct straight in approach. Hope this helps someone......Don


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PostPosted: Sat Jul 15, 2017 5:51 pm 
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Joined: Tue Feb 21, 2017 9:27 am
Posts: 60
I think tha the holes are 20mm so why couldn t you fit the steel one.


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PostPosted: Mon Jul 17, 2017 4:59 pm 
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LUVTruck.com Guru

Joined: Tue Dec 11, 2007 9:20 pm
Posts: 171
Location: Phoenix Arizona
Couldn't find one here in PHX. The closest was a CARQUEST 20mm plug but the O.D. of that one was 20.98 mm. Way too big. I tried it and as a result I still have 4 left that won't work. There must be actual 20mm plugs out there but I just couldn't find them. If you need the truck, then you do what you do to fix it. Works for me.


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