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Author Topic:   lean or deternation
posted January 28, 2004 05:51 AM
I have an inline GM 6 flat top 14:1 on alky
and I have just burnt a piston on the ring land oppisite the spark plug/ chamber area
my engine builder says lean but the exhaust ports and plugs say rich ( black deposites in ex ports) I think its pre ignition by a bad head gasket firing ring that apears crimped and is burnt motor only did 8 laps and the bearings are fine how can you tell lean from deternation

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