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Old May 29th, 2009, 10:49 PM   #1
speedfreakracing
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Default Spark plug application question for 406

Ok, I'm hoping somebody might be able to help with a good starting point for a spark plug for my engine. It is a 406, forged pistons (12.86:1 comp ratio), 5.7 rods, Dart Iron Eagle angle plug heads (230cc intake runner, 2.08 1.60 valves), Vic Jr. intake, Holley 650 double pumper carb, Comp Cams 292H cam, Crane gold roller rockers 1.5 ratio. I run it on Torco race fuel also. I've been reading that AC delco R45's are a good plug to use. I have Autolite 26's in it right now but it is fouling them out (not sure what heat range they are considered in AC Delco). I'm running a 4spd manual trans also. Any help would be greatly appreciated, Thanks,
Mike
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Old May 30th, 2009, 10:45 AM   #2
Kodiak450r
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i run delcos in everything and never had a problem with fouling. i prefer the rapidfire plugs
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Old May 30th, 2009, 04:25 PM   #3
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Originally Posted by Kodiak450r View Post
i run delcos in everything and never had a problem with fouling. i prefer the rapidfire plugs
Same here. I ran AC's in the last few setups of mine. I think in my last motor I was running 44's.
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Old May 30th, 2009, 07:24 PM   #4
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Quote:
Originally Posted by speedfreakracing View Post
Ok, I'm hoping somebody might be able to help with a good starting point for a spark plug for my engine. It is a 406, forged pistons (12.86:1 comp ratio), 5.7 rods, Dart Iron Eagle angle plug heads (230cc intake runner, 2.08 1.60 valves), Vic Jr. intake, Holley 650 double pumper carb, Comp Cams 292H cam, Crane gold roller rockers 1.5 ratio. I run it on Torco race fuel also. I've been reading that AC delco R45's are a good plug to use. I have Autolite 26's in it right now but it is fouling them out (not sure what heat range they are considered in AC Delco). I'm running a 4spd manual trans also. Any help would be greatly appreciated, Thanks,
Mike
A 45 is too hot for that compression, I would think a 43 would even be pushing it. Either a delco 42 or I would run an Autolight AR23 or AR24 racing plug. You could also run a NGK UR4
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