The reason I ask is I have never run aluminum heads on anything except my 2.2's. Someone told me that if the Iron head required a RN12YC that the alumumn would wick too much heat out of that plug so 1 or 2 steps hotter is needed.
1984 Dodge Shelby 2.2 10:1 CR was RN12YC. Mine was a 0.040 over true 11.2:1 CR and I found a RN9YC worked best.
1984 Dodge Rampage 2.2 8.5:1 CR was RN14YC
Last edited by Dave_J; 03/17/20 03:56 PM.
Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
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