M & A Heads.......what spark plug?

[turbodave231]

I'm assembling an engine with M&A heads. There were no plugs in the heads when I disassembled the engine. What plugs are correct. The plug holes don't look like they are machined for a tapered seat plug.

 

[TurboBob]

In the old days FR1LS was suggested by Kenny D

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[turbodave231]

Thanks Bob!

Its good to have guys around that remember Turbo Buick History!