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White spark plugs, too lean????? 1955 Tbird Holley 4000

Posted By RossL Last Month
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RossL
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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.

KULTULZ
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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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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

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. 
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
FORD DEARBORN
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http://forums.y-blocksforever.com/uploads/images/a31a78c7-3a4a-4c92-847e-d7f.jpegMaybe this will help.

64F100 57FAIRLANE500
KULTULZ
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