What is the general norm for the heat range of spark plugs in an injected alky engine.
We are running a 462 Buick that is 13.6 to 1.
Last week was the first time out with the new engine. We were using NGK BR8ES plugs at .035 gap. MSD 6AL system with a 16 volt XS battery on board. We were running very rich at idle,250-275* EGT
We checked the leak-down on the fuel system when we got home, we were at 41-42%...... That has since been corrected and we are at 22% until we set the idle speed at the track to about 1700rpm. The fuel system was a separate issue that is now good and will work as intended next time out.
Any direction hot or cold on the plugs is appreciated.
Thanks in advance.