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Old 10-12-2004, 03:03 PM
mark peterson mark peterson is offline
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Join Date: Jul 2002
Location: Troy, MIchigan, MI
Cobra Make, Engine: Lonestar 427 SC w/351 with 400 HP: 69 Black Jade GT500
Posts: 48
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Default 428 Cobra jet Cylinder Compression

Does anyone know what the compression should be in PSI for a 428 CJ. I did a test last week and most cylinders were about 90-100 psi. This is by spinning the engine with a long handled torque wrench from the front pulley. Someone said 150-180 was normal.

If this is normal do I need rings. The engine has about 91,000 miles on it. Does not seem to burn oil. All plugs looked tan and clean. thanks, mark
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