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

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
BTW, is that compression ratio actual measured or maybe correct If it is the actual ratio those plugs should be in the ball park If it is lower than that then you might want to use a hotter plug It is a lot safer to use a colder plug when in doubt so be safe

NGK 4554 (R5671A-8)

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!!!!!!!!

Thanks for your advice, it will get me in the right direction.

I would think an NGK# 7 would work well...........

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