Spark plugs..
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MSD makes a set custom built for the GTP which is an exact fit for our bonnevilles. they are 8.5mm. i have a set on mine and was only like 55 bux from summit. if you run a smaller pulley, defintly go colder in the heat range. i did have NGK iridiums but ran into KR at the track. so now i have autolite copper plugs #103 that are 3 heat ranges colder.
definitly do not run plat. in a SC car, the plat. tip has been known to come off under high boost conditions
definitly do not run plat. in a SC car, the plat. tip has been known to come off under high boost conditions
Just remember that the bigger the wires, the harder they are to get into the retainers. There is no performance or lifetime change between 8 or 8.5mm. Pick the wire you want, and go with it.



