my poor R motor consistently breaks/melts the electrode off the sparkplug in cylinder #3
this is a stock R motor with a toda header, smsp cat, and the milk jug removed from the stock intake. the other plugs are white (lean?), but don't have any other issues. the fuel filter is new and i moved the injectors around (assuming clogged injector), but the problem remains with cylinder #3.

the motor's compression is fine, cylinder #3 is probably the best of the bunch. is it possible the piston could contact the sparkplug, but not damage the valves?

i do the valve adjustments myself and the problem occurred before the adjustment and remains afterwards. the distributor timing was checked and is at stock 16deg btdc, but i plan to get it rechecked.

what haven't i thought of? what could cause this problem?

i've heard that a header can cause a motor to run lean and cylinder #3 already is the "hottest" one, but i've never heard of anyone else having this problem.