What plugs

[twayne24365]

Hey guys, going to get a new set of plugs for the 440
It's .030 over
10.5:1
CNC ported stealth heads
626 lift 260* duration @.50
Victor intake with 850 Holley
Msd6al with pro billit distributor and blaster 2 coil
Currently has rc12yc

 

[bOb shingler]

try the same heat plug in a ngk.

 

[famous bob]

try the same heat plug in a ngk.

same build, only 505" . started w/ ngk 7`s, think I need I range hotter---------------bob

no resistors !

 

[twayne24365]

Shouldn't it be 1 to 2 colder? Since the rc12yc are a factory heat range?....seems they are too hot. Seems to me the porcalin is cooked and its running rich

 

[Marcohotrod]

yes 10.5 with aluminum heads go champion 10