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Got a 540-BBC with SRP I believe 10.5 pump gas pistons and I am using the GM 990 square port heads anyone have knowledge of what plugs and heat range I should start with ? Thanks
 

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F.T.W. KILL EM ALL
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NGK's are a Killer Plug. N/A you can probably start out with a set of R5671A-8's or possibly 7's. The 7's may be just a little to hot. Lets see what other's think. Good Luck :)
 

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