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Anyone have a manual to tell the plug gaps on a 1990 5.7 w Thunderbolt ignition, and a 1987 454 with the same ignition, I allready know the plug is a 43 delco...thanks:D
 

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GEt the stainless steel plug. or, make sure you put "marine grade anti sieze" on the threads. Plus put some dia-electric silicone in the spark plug boot
 

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.060 is a big gap for a stock setup. I'd go with .045 and call it a day. most people and shops, dont check them from factory settings. Check it and see what it is. If you have a MSD or Crane box then I'd go larger say .060
 
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