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Old 03-01-2011, 11:20 PM
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The O-ringed block won't keep you from using a thinner head gasket if you use a wire O-ring sized to be just slightly above the deck. Some recommend filling the groove w/a copper wire then taking it down level w/the deck. If the block is at zero deck, THAT will stop you, though.

One last try: What is the NA ignition timing curve like, and are you positive the TDC line is accurate on the damper/tab?
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