spark plug gap?

[herrbartlet]

Can't believe no one has the correct info for you. I only have spark plug data on the 360 (Champion RN12Y) and 383 (Champion J11Y) engines, both of which recommend a gap of 0.035"/0.9mm, so until someone posts a definitive answer, you'll not be far off using this gap.
There's plenty of info on the internet about using incorrect plugs and/or gaps, but at the end of the day, we are all trying to get our engines running as sweetly and efficiently as possible, which means the correct heat range plug and gap, as well as timing of course. You go away from optimum settings and you don't get optimum performance.

You could always try the 3 or 4 electrode plugs (more sparks/better combustion), if your wallet is sizeable enough, which have pre-set gaps.