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Unfortunately, The exhaust valve prevents the use of power tip plugs in most heads. The location of the ex valve near the exhaust was there to keep the spark plug clean. Back min the day you had to clean your plugs every 5/10,oo0 miles. the Edmonds heads located the plug between the valves sso a mpower tip can be used. As you saw in JWL's book he just moved the plug into the transfer area where it does the most good.