autolite 104 spark plug

[fastback4]

These autolite 104's where in the heads of the 3400 i got from a salvage yard. They are brand new. This car was rear ended. What type of heat range plug are these........Tom

[robertisaar]

i would call them junk and to swap in some proper ACDelcos...

but

http://www.autolite.com/pdf/auto_crossref_0311.pdf

apparently they interchange with R44LTS... i know R44LTSM was the standard plug for late 3.1 and early 3100s...

http://60degreev6.com/forum/showthre...pushrod-motors.

i guess you can run these through to see if they interchange like they should.

[86FieroSEv6]

They are "medium" heat.