I just did the same thing. When I got my car last year it had NGK B7ECS
plugs which are relatively cold. I have just changed to NGK BP6 ES and the
car runs much better and it has eliminated any spit back from my Webers.
BTW I highly recommend NGK plugs , they are used by all the classic
performance and race people over here. Their range runs from numbers 1-
12, 1 being the hottest, 12 the coldest.
Derek
On Wed, Aug 14, 2013 at 3:17 AM, john spaur <jmsdarch@sbcglobal.net> wrote:
> I recall emailing the list about the car coughing (spitting) fuel out the
> carbs. I checked the timing, points gap and valve clearances; all spot on.
> The spark plugs were Bosch WR7DC which a parts person told me were correct.
> However, I wanted Champion so I replaced the Bosch with Champion N12YC
> plugs. I could not find the RN12YC plugs which have a resistor but I have
> since found them.
>
> The Bosch plug was a colder plug than the Champion. Changing to the hotter
> plug dramatically improved the performance. The Bosch plugs had a light
> gray color on the tips and were slightly oil fouled. The Champion plugs
> have a nice tan color and are even in color from plug 1 - 6.
>
> BTW, Moss sells the Champion N5C plug which is colder than the Bosch and
> would have been far worse.
>
> Check the plug specs carefully when changing plugs. Just today a sales
> person at O'Reilly Auto Parts told me that he had an Autolite plug that
> looked exactly like the Champion plug I wanted. When I asked him what the
> heat range was he could not tell me. BTW, heat range scales differ between
> manufactures and can be inverted so be careful there too.
>
> The heat range made a huge difference in performance!
>
> John Spaur
> '62 BT7
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