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Vic Piano · 04-19-2019, 10:04 AM

Richard, the Autolite 437 is the plug I use on '39 to '53 Flatheads equipped with after-market aluminum heads. Sorry if I didn't make that clear in my previous post. The plugs in your '34 are 18mm. I'm not sure if Autolite makes a plug suitable for your car. Vanpelt Sales website recommends Champion 7 (18mm). I'm not a fan of Champion plugs but, if that's all that are available...

04-19-2019, 10:04 AM	#2722
Vic Piano Senior Member Join Date: May 2010 Location: Odessa, FL Posts: 7,611	Re: What I Did on My Lunch Hour Richard, the Autolite 437 is the plug I use on '39 to '53 Flatheads equipped with after-market aluminum heads. Sorry if I didn't make that clear in my previous post. The plugs in your '34 are 18mm. I'm not sure if Autolite makes a plug suitable for your car. Vanpelt Sales website recommends Champion 7 (18mm). I'm not a fan of Champion plugs but, if that's all that are available... __________________ Imagination is more important than knowledge.