1980 Spark Plugs

[Steve King]

My 1980 has AC Delco R45TS spark plugs in it. Are these the correct plugs for judging?
Steve

[Steve King]

Re: 1980 Spark Plugs

I found the number in the manual, its R45TS.

[Bob B.]

Re: 1980 Spark Plugs

Steve
NCRS does not judge spark plugs because generally they cannot be seen. However if the plugs can be identified without component disassembly non AC brand plugs can be up to a 10% deduction for each non AC plug.

[Steve King]

Re: 1980 Spark Plugs

Do these plugs have different GM part numbers? Are all AC R45TS plugs ok to use. I found two different pert numbers 561357 and 5613303.
Steve

[Joe L.]

Re: 1980 Spark Plugs

Steve-----

GM #5613303 is discontinued and replaced by GM #5613957. As far as I know, both are AC-45TS.