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For me it was obvious. All cylinders had 150 psi with the exception of #6 which had only 90. A leak down on 6 revealed 60% loss from an exhaust valve. Fresh new valve job with all new valves and my motors back to 1 to 2% leak down on all cylinders. An initial loss in power is what lead me to start investigating.
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Grappler
Know Gi / No Gi
1976 RSR Backdate (Turbo 3.2)
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