best spark plug for a 68 z

[fireZ]

Anyone have a favorite plug to use in a stock 302 motor.  AC43s seem to foul up terrible even with the carb lean.

[sam]

I use R44S with no problems.

[Jerry@CHP]

AC44s are not made anymore, the easy substitute is Champion J12YC.  Same plug.  This is what we use.

Jerry

[fireZ]

Thanks Jerry for the spark plug info. I recieved the 4th edition book this week,great source of information. It is a must if these cars are your passion.

[JohnZ]

Mine is driven normally around town and on the highway (not raced) with Jerry's distributor setup and 72/76 jetting, and I run AC R45S plugs (also run them in my small-block '67 Corvette), and I have no fouling issues at all (did have some fouling with 44's, and 43's are WAY too cold for normal street use).

[x77-69z28]

i run 45s also. no problems

[Jerry@CHP]

45s will work for cruising the streets.  Only problem I found with them is in hot weather during the summer if you climb on the rpms a little, there is a good chance that the engine might ping w/36 degrees of total advance (93 octane).  They definately will not foul out as easially as the 44s.  Wanna keep the 44s clean, take 'er up to 7000 rpm once in a while...........now you're talking!

Jerry

[fireZ]

There is no better sounding car than a 302 z ringing out at  7000RPM. I remember visiting my Grandpa at a local GM dealership and seeing these 302 cars coming in and out for service and test drives. No better rush for  a young kid.

[detfox]

Mine is driven normally around town and on the highway (not raced) with Jerry's distributor setup and 72/76 jetting, and I run AC R45S plugs (also run them in my small-block '67 Corvette), and I have no fouling issues at all (did have some fouling with 44's, and 43's are WAY too cold for normal street use).

It's the same for the 69 302..correct?

[Jerry@CHP]

Yes it is,

Jerry

[jdv69z]

AC44s are not made anymore, the easy substitute is Champion J12YC.  Same plug.  This is what we use.

Jerry

I discovered the Champion J12YC several years back while checking cross referencing charts. I tired 'em and like 'em in my 69 Z. I always have a couple of sets ready to go. Seem to be easy to find as well.

Jimmy V.