75gmck25's latest activity
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75gmck25 replied to the thread Big block running hot. Can’t figure out the issue.Not to nitpick too much, but stoichiometric (best) AFR for gasoline is about 14.7. 14 is slightly rich, but that should actually help... -
75gmck25 replied to the thread Tool for adjusting idle.Original Quadrajet idle screws are usually a double-d shape, and there is a flexible carb tool that has that special end on it. When I...
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75gmck25 replied to the thread Steering Help.One simple check - make sure all the air is out of the system. GM book says to jack it up with both front wheels off the ground. Then...
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75gmck25 replied to the thread brake pedal has no pressure.All good suggestions. If the seal is torn or damaged inside the master cylinder it will not seal against the cylinder, and the pedal...
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75gmck25 replied to the thread 82 Sierra Grill alternatives.When you start swapping grills, remember there are sometimes also differences in mounting brackets. I have about a ‘79 grill on my ‘75...
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75gmck25 replied to the thread First real drive! Not tragic but not good. I think I need carb advice..One strong recommendation is to immediately convert it to HEI ignition. It is very reliable, and does not require periodic adjustment...
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75gmck25 replied to the thread First real drive! Not tragic but not good. I think I need carb advice..Also get number off the side of the Quadrajet. For example my ‘75 Quadrajet is 7045583 YZ.
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75gmck25 replied to the thread A/C Question.I do not have a write up, but I have a lot of pictures and a list of everything used. This could motivate me to write it all down in...
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75gmck25 replied to the thread A/C Question.The old A6 compressor is a true boat anchor, and it has heavy brackets to keep it supported. It’s also now old and not very reliable...
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75gmck25 replied to the thread First real drive! Not tragic but not good. I think I need carb advice..The air cleaner has a thermostatic valve in the snout to control heated air, and it’s connected to vacuum at the carburetor. No reason...
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75gmck25 replied to the thread LMC headlights/harness kinda wonky.Bought one of the LMC kits many years ago. Wiring seemed a little chintzy (not really HD) at the same, but it’s lasted a long time...
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75gmck25 replied to the thread Found the oil leak - front oil pan seal or timing cover gasket?.IIRC, to get a good seal you have to install the timing cover first, and then the oil pan. Someone may have pulled the timing cover...
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75gmck25 replied to the thread First real drive! Not tragic but not good. I think I need carb advice..I believe that vacuum hose is for the HVAC recirculate function. It has a T because it connects to a vacuum motor in the cowl, and...
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75gmck25 replied to the thread First real drive! Not tragic but not good. I think I need carb advice..Your truck is nearly identical to my ‘75 GMC K25, except that in ‘75 they made HEI ignition standard and tweaked a few other minor...
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75gmck25 replied to the thread Help with starting 79 k20 400SBC.I’m a little confused about where you are at in your installation. You said it ran with the Quadrajet, but not very well, so you...
