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  1. GT (1963-1977)
    I'm trying to identify the build-up on my valves. It looks like carbon but not sure if it is, what causes it or how best to address it. Spark plugs are NGK 7(?) that are gapped at 0.035 in. Run with 91 octane gas. Engine is a 74 2L. Pretty sure it has 10.4 or similar high compression...
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