1972 GMC C1500 ENGINE COMPRESSION

1972 GMC C1500
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PEANUTBUTTERNJELLY
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Engine Performance problem
1972 GMC C1500 V8 Two Wheel Drive Automatic
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I JUST FINISHED REBUILDING MY V8 ENGINE,AND I;M HAVING A COMPRESSION PROBLEM.I TOOK READINGS ON ALL CYLINDERS.(#1)120psi,(#2)0psi,(#3)0psi,(#4)140psi,(#5)105psi,(#6)0psi,(#7)120psi,(#8)130psi so could you please tell me why three of my cylinders have no psi and how can i fix the problem thank you
Jul 8, 2008 at 10:27 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
It might be that you have adjusted the valves too tight and they are not closing all the way, try readjusting them and let us know.
Jul 8, 2008 at 10:39 PM
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