spark plugs question
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spark plugs question
i have a 400 it was told it is stock, with bout 5000 miles. nothing wrong with it i drove it for 1000 miles just wanted more power, while i started to pull it down and i see that it has ac delco plugs r45ts which is the same as a 26 autolite, the truck calls for a 25 why would you want it hotter than stock, now ive put a lunati vodoo cam 62501, springs retainers, pushrods, weiand 8010, and a carter 625cfm, and easied the edges in the ports of heads, wwhat plugs would u recommend, on my harley with motor work they always went 2 ranges colder, i was thinking just stock plugs in this application. thanks mike
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