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Jose Motor Sports recommended we use AC Delco R44TS plugs and set the gap at .035-inch (stock is .045-inch). Since you need to remove the plugs to add air pressure to each cylinder when changing valvesprings, we decided it was a good time to install fresh plugs. Most racers run a smaller plug gap with a power adder (nitrous, supercharger, or turbo). View Related Article
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