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KULTULZ
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Last Active: 2 days ago
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FORD DEARBORN
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 Maybe this will help.
64F100 57FAIRLANE500
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FORD DEARBORN
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Just installed a set of NGK WR5's in my 312 and so far very satisfied. Resistance reading 10% within 5000 ohms - that's very good.
64F100 57FAIRLANE500
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55blacktie
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I was going to buy Autolite plugs from Walmart, but they raised the price. I ended up buying NGK plugs from RockAuto (best price at the time). My NGK plugs are V-Power Resistor Type plugs, WR5 2438.
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RossL
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KULTULZ (6/23/2026)
- AUTO-LITE - BUT WON'T -
- QUOTE FROM TED EATON -
SPARK PLUGS – AUTO-LITE
I am slowly moving away from Auto lite to NGK on the shop-built engines due to having a better heat range selection with NGK’s as well as having some brand new Auto-lites not firing from the git go. The Auto-lites have been coming from both Mexico and China, but it is the China made Auto lite spark plugs that I have had trouble with. It seems to be potluck at the parts store on which country of origin the Auto-lite spark plugs are from. I now do a mandatory ohm check on the new spark plugs before installing them.
TED EATON - http://forums.y-blocksforever.com/Topic165607-3.aspx
Can you find the NGK's in different heat ranges? I was looking for WR6 and could not find them
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KULTULZ
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Group: Forum Members
Last Active: 2 days ago
Posts: 1.9K,
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- AUTO-LITE - BUT WON'T -
- QUOTE FROM TED EATON -
SPARK PLUGS – AUTO-LITE
I am slowly moving away from Auto lite to NGK on the shop-built engines due to having a better heat range selection with NGK’s as well as having some brand new Auto-lites not firing from the git go. The Auto-lites have been coming from both Mexico and China, but it is the China made Auto lite spark plugs that I have had trouble with. It seems to be potluck at the parts store on which country of origin the Auto-lite spark plugs are from. I now do a mandatory ohm check on the new spark plugs before installing them.
TED EATON - http://forums.y-blocksforever.com/Topic165607-3.aspx
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RossL
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Group: Forum Members
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DANIEL TINDER (6/23/2026)
Are AL #45s still available? I thought I read somewhere a while back that they were discontinued. Autozone has them in stock. I read Autolite's parent company is bankrupt.
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DANIEL TINDER
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Are AL #45s still available? I thought I read somewhere a while back that they were discontinued.
6 VOLTS/POS. GRD. NW INDIANA
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RossL
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Group: Forum Members
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Ted (6/10/2026)
For the spark plug heat range, I am looking at the color change at the threads. I consider the spark plug heat range to be about right when the color change occurs at two threads in from the bottom of the plug. If the color change is occurring at three threads in or more, then the plug is running on the hot side. Your plug on the right side of the original picture looked to be wet or not burning completely at the threads which would put it on the cold side. Maybe that’s the result of some excessive idle time before removing the plug? The left side plug looks much better. Don’t confuse oil or wetness on the threads for a heat color change. I am looking at a picture so I could very easily be wrong on this one. Autolite 45’s are colder than the Autolite 46’s and yours do look to be 45’s.
Looking at the last picture you posted and based on the wet appearance of the outer ring, I’m going to say you are rich. If it rubs off easily with a swipe of your finger, rich it is. Before the days of the wide band and A/F sensors, spark plug readings did get us to where we needed to go.
For the timing, I look at the color change in the strap. In the middle of the bend is always a good target for that. The color change being closer to where the strap attaches to the spark plug outer indicates too much timing and closer to the end of the strap or center of the plug is not enough.
Other comments always welcome. When I removed the plugs there was some oil (leaking from valve covers) on the threads. Could this be part of what you are seeing on the threads? I did want to try a colder plug (# 45) because the previous set was very white
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Ted
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Group: Administrators
Last Active: 4 days ago
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For the spark plug heat range, I am looking at the color change at the threads. I consider the spark plug heat range to be about right when the color change occurs at two threads in from the bottom of the plug. If the color change is occurring at three threads in or more, then the plug is running on the hot side. Your plug on the right side of the original picture looked to be wet or not burning completely at the threads which would put it on the cold side. Maybe that’s the result of some excessive idle time before removing the plug? The left side plug looks much better. Don’t confuse oil or wetness on the threads for a heat color change. I am looking at a picture so I could very easily be wrong on this one. Autolite 45’s are colder than the Autolite 46’s and yours do look to be 45’s.
Looking at the last picture you posted and based on the wet appearance of the outer ring, I’m going to say you are rich. If it rubs off easily with a swipe of your finger, rich it is. Before the days of the wide band and A/F sensors, spark plug readings did get us to where we needed to go.
For the timing, I look at the color change in the strap. In the middle of the bend is always a good target for that. The color change being closer to where the strap attaches to the spark plug outer indicates too much timing and closer to the end of the strap or center of the plug is not enough.
Other comments always welcome.
  Lorena, Texas (South of Waco)
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