Wanting to confirm correct plugs for a 69 350/350 4 speed..no AC. As best I can tell correct would be the AC Delco 44S. Can anyone help confirm that for me? Or point me to where I can do so?
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late Oct 1969 L46 350/350, M21 4spd, 3.70 posi convertible --As with life, restoration is a journey, not a destination. Though restored cars provide both journeys AND destinations! -
Re: 69 Spark Plug help please
Keith,
The original plugs for your car were R44. The "R" designation first appeared on the Flint engine assembly line in 1969. A 44S would be a fine plug to use (assuming the internals of the engine are factory). In fact much later the plug specified in the AC catalog were R43S when AC discontinued the R44 plugs. Hope this helps.
Jeff -
Re: 69 Spark Plug help please
For street driven, R45 is a good all-around plug. In general the 44 heat series often fouled in normal street driving. The "extended tip" 44S should help to reduce fouling as well.
My 1967 327/350 HP car has AC 45 in it currently. I used to run AC 44, but as stated fouling was an issue.
FWIW.
LarryComment
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Re: 69 Spark Plug help please
Larry,
You are right that a one number higher heat range is better for regular driving. I use R45's in my 69 SBC. But I took the question to be what was the correct plug which I took to mean "What was in the car when delivered by the dealer?" That is why I advised the R and the 44.
JeffComment
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Re: 69 Spark Plug help please
Jeff:
You are correct. And I took your answer that exact way.
However, I also wanted Keith to understand that for DRIVING, the 45 series is generally preferred by those of us who have been driving and living with these cars for over 50 years.
LarryComment
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Re: 69 Spark Plug help please
Thanks gents. indeed my original question was oriented toward what was the car originally delivered with ...which I understand was AC44S...?. And the ....what runs "better" info is definitely good to know as well. As noted in another thread...this is planned to be a 3 year plus or minus rolling restoration...so originality sort of counts now...but not as big a deal for parts that might be needing replaced more soon than others.
Is AC45 and R45 the same thing?***************
late Oct 1969 L46 350/350, M21 4spd, 3.70 posi convertible --As with life, restoration is a journey, not a destination. Though restored cars provide both journeys AND destinations!Comment
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Re: 69 Spark Plug help please
NO. One is a resistor plug and one is not. But for all practical purposes they perform about the same.
Larry
PS: If Originality is your goal, the R44 plugs should have four (4) equal thin green lines on the plug body. Jeff can also fix you up with these if you ask him.Comment
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Re: 69 Spark Plug help please
I'm away from home traveling, and don't have the Owner's Manual for my '69 350/350, but I believe the original plug specified by the factory for your car is in the Owner's Manual.Comment
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Re: 69 Spark Plug help please
So I did get around to checking the owners manual...specifies R44 shipped with the vehicle but recommends R45 for city driving. Both of those I am looking at have the 4 green stripes so I conclude would both be "correct" for the vehicle. And would take the advise given to run the 45s as I will be mostly city driving. thx***************
late Oct 1969 L46 350/350, M21 4spd, 3.70 posi convertible --As with life, restoration is a journey, not a destination. Though restored cars provide both journeys AND destinations!Comment
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Re: 69 Spark Plug help please
For judging use the R44.
When you finally get/want to drive the car, switch to the R45.
LarryComment
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Re: 69 Spark Plug help please
Beware ACs are no longer made here. Guess where??? And guess where the quality went?
I was an Autolite fan too....no longer made here! So tired of this.
Doing an online search to see what was left besides NOS I came up with NGKs.
Some are made here some are made in Japan.
Id much rather use them for that fact. Mine doesn't nor ever will be judged.
Just bought a set of V powers for the 442.
Watch out for fakes.
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