Spark plugs

[lrdlt265]

Hey guys im trying to find spark plugs for my sbc 406 that is supercharged im just having a hard time finding colder ones. Could anybody help me out or point me in the right direction? Thanks Andy

[saleen89559]

What kind and heat range are you using now? NGK plugs go higher in number for colder heat range.

Example since I am a Mustang guy: NGK TR50 is about right for a N/A Mustang 4.6 or 5.0. NGK TR55 is good for low boost on those applications, TR60 is good for higher boost.

[lrdlt265]

well its a 406 with angle plug 292 turbo heads, and i tried ordering plugs they were the wrong ones tho. I think its a 16mm thread and i got 14mm. I was looking for a 2 step colder plug. Im not going to be running lots of boost as of now. But maybe in the year.

[russ67chevelle]

i love ngk plugs v-powers...call your head manufacturer and tell them your story,they should get u in ball park.i use 5671-7 on motor 8 or 9 on nitrous runs,love them!maybe ask about v power plugs to manufacturer