sparkplugs

vic/ma

vic/ma

Junior Member
Are Bosch sparkplugs any good in 37 85hp flathead, if so what
number is good to use?
Thanks Vic.
 
I don't know much about Bosch but I had new Autolite 386's in my stock 36 21 stud and it idled crappy, like an intake leak.Hooked up a vac.guage and it bounced between two points. I took Ken ct's advice and installed Champion D21's. HUGE difference!The idle smoothed out and the vac. gauge didn't even wiggle. I always thought a plug was a plug.........apparently not.
 
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