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spark plugs

SAILOR

Member
Joined
Jan 30, 2022
Messages
6
Location
01226
Corvette
1972 BLUE COUPE
putting finishing touches on my 67, 427 tri power. Spec plugs are R43N which are no longer available. I would appreciate any input on the right replacement.
 
Welcome to the CAC

Good question. I see there is a set on Ebay for $108.00.
I searched the AC Delco on line catalog and came up with these replacements for the R43N.
ACD_phoenix_logo_gold.svg

PROFESSIONAL​
Spark Plug
Rapidfire Spark Plug
Part# 4 - ACDelco
Part# 19307141 - GM


Per Veh
: 8
Years: 1966-1968
Gap 0.035 (in)

ACD_phoenix_logo_gold.svg

PROFESSIONAL​
Spark Plug
Conventional Spark Plug
Part# R43XL - ACDelco
Part# 19422132 - GM


Per Veh
: 8
Years: 1966-1968
Gap .035


Tom
 
Thanks for looking into this, any idea what XL means.
 
Looks like the only difference is the thread length. XL is threaded 3/4" and the N is full threaded. Both are extended reach.
 
Last edited:
thanks a lot for the chart, plug selection has always been a bit of a mystery.
 

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