75gmck25's latest activity

  • 75gmck25
    I used Mahle .026 head gaskets with my crate 350 and 64cc Blueprint heads, to try and make up for the low compression of the stock...
  • 75gmck25
    I appreciate your motivation, but that’s a long distance and lots of gas for a 4WD squarebody . Why don’t you let the military ship...
  • 75gmck25
    75gmck25 replied to the thread 1973-1980 Tailgate Trim.
    I have the original ‘75 tailgate with a narrow band and centered GMC, and I have a complete 80’s bed on the truck, with a wide band that...
  • 75gmck25
    75gmck25 replied to the thread Gas tank pressure problem.
    Go back to basics and check your sending unit and fuel pump fittings. The optimum solution for fuel flow and venting is a three port...
  • 75gmck25
    On my ‘75 with A/C the high speed relay and the resistors are mounted on the big evaporator plenum under the hood. I’m not sure where...
  • 75gmck25
    75gmck25 replied to the thread Tilt Steering Column.
    Has the ‘75 transmission been swapped with something newer? There was no 4 speed auto in ‘75. I’m also confused about your mention of...
  • 75gmck25
    As already mentioned, first make a couple of checks of the existing setup. - Is it a 3 port fuel pump with a return to the gas tank...
  • 75gmck25
    Does your block have the option of installing a stock mechanical pump? They are really cheap, and generally reliable once you find a...
  • 75gmck25
    75gmck25 replied to the thread Storage tray.
    Why is the top edge of the back piece so uneven? Is there a piece of trim that goes over it to hide the edge? My truck has holes in...
  • 75gmck25
    75gmck25 replied to the thread Which A/C compressor do I have?.
    I had to do some more research, but then determined there is an A6 (which my '75 had), a DA6 (used in late 80's), and then a later HR6...
  • 75gmck25
    75gmck25 replied to the thread Which A/C compressor do I have?.
    The one in the picture looks like an A6, but it’s the strangest set of mounting brackets I’ve seen. An A6 is usually mounted much...
  • 75gmck25
    75gmck25 replied to the thread Inconsistent fuel pressure.
    I also recommend you find a good new or used large cap HEI distributor (coil is in the cap) and make the swap. There is no reason to...
  • 75gmck25
    If you want to measure timing beyond what shows on the pointer, you can install a timing tape on the balancer, which will have degree...
  • 75gmck25
    75gmck25 replied to the thread Battery / charging isolator..
    The original setup on my '75 Camper Special had a relay (silver body, similar looking to the blower relay on the A/C plenum) mounted on...
  • 75gmck25
    75gmck25 replied to the thread Vortec heads.
    I used these heads on my SBC, and they are a complete assembled head. They don’t claim to be a Vortec clone, but have similar...

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