75gmck25's latest activity
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75gmck25 replied to the thread 83 K20 GEAR RATIO.Based on my references, the 4.56 was only a factory option for the K30, and 4.10 was the lowest ratio for a K20. However, it may have... -
75gmck25 replied to the thread Newbie Vortec Cam Question.Do a search for the Engine-masters video where they compared intake manifolds and how well they worked. Don’t get confused about high...
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75gmck25 replied to the thread Fuel mixture screws.Since you already have the plugs out, I would pull the valve covers and adjust the valves. You might also find that you have a really...
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75gmck25 replied to the thread Heater not working but blower motor working just fine..The lower blower speeds go through the resistor pack, and the high speed is a direct connect through a separate fuse. The separate high...
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75gmck25 replied to the thread Recently acquired 1977 K20. I want an original-ish truck..Do you know what thermostat is has? Stock would be a 195 degree, but many guys get the idea that a 180 or even a 160 would work...
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75gmck25 replied to the thread Carburetor on my 82' C20.California 17080513 vs. 49 state 17080213 version of the same carburetor. It should work fine, or maybe even better.
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75gmck25 replied to the thread Rear Bumper 1986 K10.My Dad sold Ford trucks in that timeframe, and they seldom ordered the factory bumper. His rationale was that farmers and ranchers...
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75gmck25 replied to the thread thoughts on low vacuum?.Most big cams need more timing to operate effectively. I would advance base timing to at least 12 at 650 rpm, but not more than 16...
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75gmck25 replied to the thread Front posi-traction differential.In general, if you expect to drive it on pavement, you need a limited slip, selectable front differential. Some use switches that are...
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75gmck25 replied to the thread Want to build a good horsepower, good fuel economy engine for a 1978 c20 with stock 350. I don't know much and need help..I had a similar goal for my 1975 K25, so I can provide my input. - original smog era 350s and GM replacement crate engines are...
