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Lemans64


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What Spark Plug do u use???
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Hi Guys, Just wondering what spark plugs everyone is using. I am using Ac Delco's R43's in my 350. It's from a 69 Vintage Chev. small chambers. Can't remember the casting numbers though, 1.94 valves.

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64 Lemans, 4spd

Vancouver Island B.C.
427carl


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NGK in my 6.o litre GMC and AC Delco in my Rat

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2drpost


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ac delco or autolites please.

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SD 396


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AC for me but watch them.

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Lemans64


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I now some of the newer cars with the 3800 and 3.1 litre engines had some problems with carbon tracking down the outside of the plugs.

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64 Lemans, 4spd

Vancouver Island B.C.
4SPEED427


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SD 396 wrote:

AC for me but watch them.


I have one of those "press in" AC plugs as well. It seems that is not all that uncommon.

Sure would be a bear working on one of those blind spark plug holes trying to put that in.

AC's for me too. Hands down, the best plug for the old GM muscle cars.

 



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
SD 396


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Carl Stevenson wrote:

SD 396 wrote:

AC for me but watch them.


I have one of those "press in" AC plugs as well. It seems that is not all that uncommon.

Sure would be a bear working on one of those blind spark plug holes trying to put that in.

AC's for me too. Hands down, the best plug for the old GM muscle cars.


I had mine gapped before I noticed.



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1964Canso


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Delco,if unavailable,NGK for me. 



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Astro Jet


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ACs for me as well.  I've got them in all heat ranges from 42 to 46.  Been stockpiling them for years picking them up individually or in sets from swap meets.  Carl is right, GM engines like ACs better than any other plug.

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Hillar

1970 LS4 (eventually an LS5) Laurentian 2dr hdtp
-and a bunch of other muscle cars...
4SPEED427


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Years ago I tried Champions in a 327. Those plugs were junk in about 2000 miles. The AC replacements lasted what I would call a normal plug lifetime.

I also used to run the occasional set of Autolite Tuners. Anyone remember them? They were ok, but didn't like cold winter when the choke was on a lot.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
poncho62


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Gonna get slain for this, but I have never had a problem with Champions in my small blocks......Have also used ACs a lot.

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Hanover, Ont

Ontario Rodders Forum
4SPEED427


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One more beef about Champion is how easy they break. Yes, I know, I'm a lousy mechanic if I break them putting them in, but they are very brittle compared to AC.

Besides, I'm a parts manager, not a technician!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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