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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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Take the valve covers off and check the head studs.
If you find any barrel nuts, that's your problem.
Check the torque: Long 10mm Allen, set a reliable 3/8-drive torque wrench to ~20 ft-lbs, check the torque on all barrel nuts.
If any of them feel mushy, the studs may be pulling out.
Generally, avoid 87 octane, go at least 89-90.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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