Spark plug heat range

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84cutspreme

Royal Smart Person
Jun 4, 2009
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Looking for help on what is the right heat range spark plug for my cutlass. 355cid sbc, 9.85:1 compression, dart shp aluminum heads 2.02/1.6 valve, hydraulic retrofit roller cam .528/.535 lift 110 lobe, 218/224 duration. Any other info needed just ask
 
I have a simular motor i always ran ac delco r43ts plug never an issue
 
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