How do I reverse fitment use for spark plugs......

[bandit67]

Guys, I was given a small box of new 'old' spark plugs, mostly Autolite , Champion, NGK and a few AC s . Is there an easy way to find out what they fit. I can find several websites that show cross references to other name brand plugs, but not what engines they fit. Hate to just chuck em....

 

[Lefty71]

Autolite Car Catalogue

 

[fullmetaljacket]

Guys, I was given a small box of new 'old' spark plugs, mostly Autolite , Champion, NGK and a few AC s . Is there an easy way to find out what they fit. I can find several websites that show cross references to other name brand plugs, but not what engines they fit. Hate to just chuck em....

View attachment 1392840

I do know that the NGK's box number #5030 and plug number #BCP7ES fit my big block SR heads and if you would like to sell 'em, let me know.

 

[Photon440]

Finding out what engines a plug fits could be a hassle, a single plug might fit many different engines. For example, ATL-A945 will be listed for any number of big and small block Ford engines from the 50's on up, as shown by this example: Autolite P45 Autolite Single Platinum Spark Plugs | Summit Racing

 

[Geoff 2]

If they are made before the late 60s, they are unlikely to have the copper centre electrode, which greatly improved ignition capability & widened the heat range. Not sure about other brands, but NGK does reference copper in the part number.