Cuda65Steve
Active Member
Time for a summer tune up.
Whats everyone running for plugs ??
Whats everyone running for plugs ??
Spark Plugs
- Thread starter Cuda65Steve
- Start date
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Perseus
'65 Dart slantsix
NGK № ZFR5N plugs. NGK stock number 3459.
It would be helpful if you told everyone about your engine and driveline
leblanc
member 2883
send an email or phone one of the spark plug companies and use what they tell you to.
Charrlie_S
Well-Known Member
I like NGK. The particular plug depends on year of cyl head, and whether the engine is stock or modified, and usage.
I just gave NGK 2635's a shot. So far car runs good. Replaced the set of Autolites that were perfect but replaced them anyways.
Charrlie_S
Well-Known Member
I used to have good results with Autolites, but the last few years, I have had an issue with the porcelin blowing out of the shell on a few. This seems to be a problem with the plugs that have "made in China" on the box. Customer service acknoledged(sp) the problem. Might be corrected by now. No problem with the plugs made in other countries.
Perseus
'65 Dart slantsix
I threw my boxes out, but I think my Autolites said made in Mexico. Who knows, they could have been made in China anyway.
Cuda65Steve
Active Member
Sorry, it's currently a 225 with a 1bbl Holley (soon to be 2bbl Carter) and a 904 followed by a 7.25 with 3:55's.
Cuda65Steve
Active Member
So far as I can tell, no numbers, it appears to be a late 60's to early 70's block, previous owner had a rebuilt put in.
Stock as can be so far as I can tell except for the 3:55 gears out back and the 2.5" exhaust...……..
Charrlie_S
Well-Known Member
Does the head have the spark plug tubes?
slantsixdan
=..=
Cuda65Steve
Active Member
YES
Then you'll want to remove the washers before you install the plugs.
Cuda65Steve
Active Member
It's a stock engine, late 60'7 early 70's. She's my cruiser and is driven locally and on highways on a weekly basis.
It's an automatic with 3:55's stuffed in a 7.25, it's soon getting it's 2 barrel setup......
I run them in both of mine and have for decades without one issue.
Awesome. Do you know which plugs exactly? I'm running the same setup: '74 225 with the plug tubes.
Both of mine are small blocks.
I'm sorry. I meant in relation to the OG thread author.
Dartswinger70
Well-Known Member
Autolite 65s in the 340 and 63s in the 318...
Dartswinger70
Well-Known Member
I run em in my Harleys, but H-D has champion make their HD plugs. i crossed referenced the number and paid 2-3 bucks at Walmart as compared to 8-10 at Harley dealer
TylerW
Well-Known Member
I run the exact same type Champions in my '68 as the factory put in. I buy them as New Old Stock from eBay. No brand of plug has ever made it run better or worse at all.
Yup. I use em all the time
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