Spark Plugs heat range for 10.5 CR engine.
05-09-2011, 05:12 PM
#1
Melting Slicks
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St. Jude Donor '08
Spark Plugs heat range for 10.5 CR engine.
What do you think the best heat range for a 355 with aluminum heads and 10.5 CR (about 400HP) and MSD HEI distrubutor? , some suggested NGK or Champions part numbers would be great as well 
05-09-2011, 06:21 PM
#2
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I have a ZZ4 350 with 65cc AFR 195, and a .015 head gasket (probably around 10.2-10.3 CR), MSD HEI and use AC Delco Plugs. Cheap and no problems at all. I also ran the same plug in the AFR 210's I had on before. I gap them at .040
http://www.summitracing.com/search/?...1-629%20&dds=1
http://www.summitracing.com/search/?...1-629%20&dds=1
05-09-2011, 06:50 PM
#3
Instructor
I have a 406 with Afr 195's, 10 to 1 with 460 horse and AFR recommended Champion RC9YC or compatable to start I tryed hotter RC12YC but am back to cooler plugs AC 41-602 and am much happier.
Last edited by captl27; 05-09-2011 at 06:57 PM.
