51 patrician spark plugs

Posted by Steve Taylor On 2012/2/25 20:34:11

Hi all
I picked up new plugs this week and went to install them today. The new plugs are from NAPA and they had champion RJ12C listed. The old plugs are AC R46SZ. The new champion plug is about 4mm shorter tham the AC plug and I am not sure which one is correct.

Any comments

Thanks