make sure if you are going to measure spark gap that you use a round or rod type feeler guage flat ones dont measure the indentation on the electrode, which if you are precision tuning can mess things up quite a bit because depending on gap height in the indentation it could off set your readings by up to .003" of an inch. yet thats just me im a perfectionist and i also go to a school that demands precision measuring. best of luck.

Shovel all the coal in, gotta keep it rollin! .
1958 Chevrolet Apache "32"