Spark Plugs on a 1951 Henry J and/or 1952 Henry J Vagabond
Advance SERVICE INFORMATION
Henry J 1951 MODELS - 513 * 514 12.5 M - August 1950 X-19504
Page 55 -
Spark Plugs Auto-Lite AN7 Standard
1951 -1952-1953 SERVICE STANDARDS
Henry J 7.5 - Nov. 1952 Form X19524
Page 17 - Spark Plugs: Type . . . . . Auto-Lite A-7 or equivalent
1951 -1952-1953 Henry J SHOP MANUAL 12M - Nov. 1952 Form
? (My copy is torn off here)
Page 192 -
a. Spark Plugs: ....(Auto-Lite A-7 or equivalent).
AUTO-LITE SPARK PLUGS
Specification Catalog Form 1010-H 9-51 (I assume that the 9-51 stands for Sept 1951)
Page 8 -
HENRY J 1951 Standard A7 - AN7 Resistor AR8
NOTE -- The letter "N" has been discontinued in types AN5--AN5X--AN7--AN7X
Present stocks of "N" types can be used for A5--A5X--A7--A7X respectively.
Page 4 - WHEN DO YOU RECOMMEND RESISTOR SPARK PLUGS? Whenever spark plugs are replaced. Auto-Lite Resistor Plugs require no changes in standard ignition systems.
Page 6 - AUTO-LITE Type Equivalent & Heat Range Chart
AUTO-LITE SPARK PLUGS Standard A7-AN7 Resistor AR8 Transport AT8
CHAMPION J8
AC 45, 45 Com.
So based on the information above you would expect to find AN7 on early 1951 Henry Js. Then in late 1951 it would switch to A7 as stock of the AN7 would be exhausted. 1952 and on Henry J would be A7. If we accept Champion J8 (as I think we should given spark plugs are consumable items) we must also accept AC 45 or 45 com.
I am lucky enough to have AUTO-LITE A7 for my 1952 Henry J Vagabond Deluxe. I have spare spark plugs in Champion J8.
P.S. If anyone wants scanned copies of the above referenced pages of
AUTO-LITE SPARK PLUGS Specification Catalog, Form 1010-H 9-51 I would be happy to email them to you. Please send your request to
AZSteele123@aol.com.