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Author Topic: best spark plug for a 68 z  (Read 3698 times)
fireZ
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« on: June 01, 2007, 03:11:57 PM »

Anyone have a favorite plug to use in a stock 302 motor.  AC43s seem to foul up terrible even with the carb lean.
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1968 Z28 LA Built
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sam
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« Reply #1 on: June 01, 2007, 06:12:53 PM »

I use R44S with no problems. Grin
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Jerry@CHP
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« Reply #2 on: June 01, 2007, 09:29:18 PM »

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

Jerry
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fireZ
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« Reply #3 on: June 02, 2007, 08:08:43 AM »

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.
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1968 Z28 LA Built
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JohnZ
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« Reply #4 on: June 03, 2007, 10:29:15 AM »

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).
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'69 Z/28
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x77-69z28
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« Reply #5 on: June 03, 2007, 10:55:19 AM »

i run 45s also. no problems
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69 x77 burnished brown, 711 int 05A bought in 78
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Jerry@CHP
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« Reply #6 on: June 03, 2007, 01:41:07 PM »

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
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fireZ
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« Reply #7 on: June 03, 2007, 03:14:39 PM »

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.
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1968 Z28 LA Built
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detfox
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« Reply #8 on: February 26, 2008, 09:37:58 PM »

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?
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Jerry@CHP
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« Reply #9 on: February 26, 2008, 09:54:34 PM »

Yes it is,

Jerry
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jdv69z
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« Reply #10 on: March 07, 2008, 10:52:18 AM »

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.
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Jimmy V.
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