5.7L points to HEI conversion: what spark plugs & gap?

[Quack Addict]

I picked up a marine Delco Voyager conversion kit to replace the points ignition in my 1978 Sea Ray. Question is, with the HEI, do I just plug & play with the existing spark plugs or is a change needed?

Current plugs: NGK - BR6FS (roughly the equivalent of MR43T's if I'm not mistaken)

Current plug gap: 0.035"

I seem to remember non-Vortec HEI plugs getting gapped around .045" but it's been a few years.

My engine is a fresh-rebuilt, carbureted (Rochester 4-bbl) 5.7l (260hp) that is essentially bone stock post-rebuild aside from being bored .030" over. It's 2-piece rear main seal block with non-vortec heads, casting number 333882 in case it matters.

I guess I have 2 questions:
1) What spark plugs should I be running for my new HEI setup?
2) What should the gap be set at?

Thanks!

 

[Shamus O'toole]

Re: 5.7L points to HEI conversion: what spark plugs & gap?

the plugs you are currently running will be fine as is the gap.