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75gmck25's latest activity
75gmck25
replied to the thread
Anyone ever make/crimp their own high pressure hoses?
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Another thing to watch out for is that many of these hoses only work well if the fitting orientation is correct. For example, if a...
Mar 11, 2024
75gmck25
replied to the thread
Front indicators alternating when headlights on
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On my ‘75 GMC they always alternate.
Mar 10, 2024
75gmck25
replied to the thread
83 K20 GEAR RATIO
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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...
Mar 10, 2024
75gmck25
replied to the thread
Newbie Vortec Cam Question
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Do a search for the Engine-masters video where they compared intake manifolds and how well they worked. Don’t get confused about high...
Mar 6, 2024
75gmck25
replied to the thread
Fuel mixture screws
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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...
Mar 6, 2024
75gmck25
replied to the thread
Heater not working but blower motor working just fine.
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The lower blower speeds go through the resistor pack, and the high speed is a direct connect through a separate fuse. The separate high...
Mar 6, 2024
75gmck25
replied to the thread
Recently acquired 1977 K20. I want an original-ish truck.
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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...
Mar 5, 2024
75gmck25
replied to the thread
Carburetor on my 82' C20
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California 17080513 vs. 49 state 17080213 version of the same carburetor. It should work fine, or maybe even better.
Mar 4, 2024
75gmck25
replied to the thread
Rear Bumper 1986 K10
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My Dad sold Ford trucks in that timeframe, and they seldom ordered the factory bumper. His rationale was that farmers and ranchers...
Mar 4, 2024
75gmck25
replied to the thread
thoughts on low vacuum?
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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...
Mar 2, 2024
75gmck25
replied to the thread
Front posi-traction differential
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In general, if you expect to drive it on pavement, you need a limited slip, selectable front differential. Some use switches that are...
Mar 2, 2024
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.
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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...
Mar 1, 2024
75gmck25
replied to the thread
Left Turn signal . doesn't work
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Most likely to be either a bad bulb, or the ground at the turn signal housing. Also check the bulbs to make sure they are oriented...
Feb 19, 2024
75gmck25
replied to the thread
Gas smell
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I had a similar problem, and they gas mostly went onto the exhaust manifold and burned off. Gas smell, but no visible gas residue...
Feb 19, 2024
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