What Spark plugs?

[SRT_DSTRHOLC]

My friend has a motor with magnum heads and is running 10.6-10.7 compression with 89 octane, but he doesnt know what spark plugs to get. NGK v-power 7252 FR5-1 or autolike 3923
or one stage cooler for NGK FR6F-11??

Please all opinons welcome

 

[340srule]

'74,3923's are what i use in my 416,i was using the ngk's but switched over,last season..

 

[SRT_DSTRHOLC]

Was their a difference? or just cheaper?

 

[dgc333]

My friend has a motor with magnum heads and is running 10.6-10.7 compression with 89 octane, but he doesnt know what spark plugs to get. NGK v-power 7252 FR5-1 or autolike 3923
or one stage cooler for NGK FR6F-11??

Please all opinons welcome

I have the same set up 10.6:1 magnum headed 360 and run 89 octane. I use stock heat range Autolite 5224 plugs. Autolite called out a 3924 plug on early magnum engines which is the same heat range as the 5224 but the nose of the plug does not project out as much. If you look up Champion they have called for the same plug since the beginning and it is like the 5224.

No real reason to go colder on this setup.