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  1. Engine & Performance
    I've got a 97 k1500 with the 5.7 vortec that I cannot figure out what is causing a consistent misfire on cylinder 4. It idles beautifully but under any load it starts sputtering like it can't breathe, even in park if I try to gun it there is hesitation. Getting up to highway speed is difficult...
  2. Engine & Performance
    Hi, new forum member here. I’m very curious if anyone has heard a noise like this. Sound resonates from rear center of the engine, not much noise with stethoscope on oil pan, flywheel is good not cracked, ran with torque converter unbolted, noise still present. Ran with valve covers off. There...
  3. General GM Discussions
    I have a 98 Silverado k1500 with a 383 stroker with about 10k-15k miles on the motor. I have a high pressure high volume oil pump. Usually I would have 50 - 60 psi at idle. Around 80 psi at 3k and above RPM. I had recently changed the oil pan gasket, rear main seal, timing cover. No leaks...
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