Join Date: Mar 2001
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Re: \'79 F150
The guy is trying to snow you man. There is no such thing as a 5/8 ton. He probably ripped all the emissions equipment off at one point and is having a hard time selling it now, so he came up with the 5/8 BS. In 1979 the feds required all trucks with a GVW under, I think 8000 (I have to verify this #) to have emissions equipment including a cat, smog pump, EGR valve, unleaded nozzle flap in the gas tank filler neck and the fuel gauge to read "unleaded fuel only". In 79, only F250 and F350's qualified to be emissions exempt.
In the late 70's the only engines Ford offered in 4x4's were the 351M or 400. It's loosely based on the 351 Cleveland. They retarded cam timing 4 degrees from the factory for emissions reasons and it hurt engine power significantly, giving this engine a bad rap. These emgines have extreme power potential if built properly. It uses a big block bell housing bolt pattern, but is technically considered a medium block. The only difference between the 351M and the 400 is the crank and pistons. Block, rods and heads are the same. The valve cover will say 351M/400 under engine family but will say the actual engine size on the next line under engine displacement. 5.8L = 351M, 6.6L = 400.
Regarding A/C, if there is a big black plastic box sticking from the firewall on the passenger side, the truck came from the factory with A/C. If it doesn't and there's just a bare firewall with the 2 heater hoses going through the top, then it didn't come with A/C from the factory and will be WAY!!! too much trouble to convert, TRUST ME!!! The cab is actually different from a non A/C truck to an A/C truck. With A/C, there's a huge flanged hole stamped into the firewall for the evaporator box. You would have to cut one the proper dimensions in the proper location to install the evap box and so on. There's a miriad, of vacuum hoses and such for the door flap controllers, etc. It's way too much trouble.
77 1/2-79 is my neiborhood, so ask away if you have any more questions.