Thought I would go ahead and do a tune up on the 1952 3100 I purchased a few weeks ago just so I would know when the parts were all replaced. After reviewing the specs for the engine ( a 1961 235), I ordered AC Delco R45 plugs however when I pulled the old ones, noticed they are R45S with a gap of 0.030". Also the end of the plug on the 45S is longer than on the 45's.
Should I go ahead and use the R45's gapped at the spec of 0.035" or get a set of R45S plugs and gap them the same as what is currently in the truck?
As always, many thanks for your help.
