Moparts

Spark plugs.

Posted By: Cuda 1968

Spark plugs. - 07/14/16 07:41 PM

What kind of spark plugs would you recommend in a 472 Hemi with aluminum heads, 11.5 compression and a mild mechanical cam.
Thanks.
Posted By: Cab_Burge

Re: Spark plugs. - 07/14/16 10:43 PM

What's the quality of the local fuel you will be using in it? Which brand of spark plugs do you like to use? If Champions I would try a RC9YC or RN9YC and if that looks like it is to hot try a RN6YC or a RC6YC. If you like Autolites try a AR3911 or the colder AR3910 scope twocents
BTW, is that compression ratio actual measured or maybe correct confusedworkIf it is the actual ratio those plugs should be in the ball park thumbs If it is lower than that then you might want to use a hotter plug work It is a lot safer to use a colder plug when in doubt so be safe thumbs
Posted By: an8sec70cuda

Re: Spark plugs. - 07/14/16 11:02 PM

NGK 4554 (R5671A-8)
Posted By: Anonymous

Re: Spark plugs. - 07/15/16 03:57 AM

Call the NGK tech Hotline--Best tech available from any company--they put you dead on! Chip I run an 8 in a 13.7:1 think maybe a little cold for that app but...Trust in the Force and the NGK tech line!!!!!!!!
Posted By: Cuda 1968

Re: Spark plugs. - 07/15/16 08:16 PM

Thanks for your advice, it will get me in the right direction.
Posted By: Thumperdart

Re: Spark plugs. - 07/15/16 08:26 PM

I would think an NGK# 7 would work well...........
Posted By: therocks

Re: Spark plugs. - 07/15/16 08:35 PM

I run NGKs in my 12.5 440 with aluminum heads.Just changed them after 5 years.They were still running great juts did as maintaince.We run them in almost everything.We ran a lot of them at the shop also when I was working.Rocky
© 2024 Moparts Forums