I was wondering if anybody new which number plug to use
for a 70 429 with 10.5 compression,cam and MSD ignition
I prefer Autolite. Thanks.

 

I've always had good luck with Motorcraft plugs

I would run a larger gap around.60

 

I use Bosch V-Power plugs in Mine.


Dennis

Oh....Please Don't Ask Me Any Tough Questions As:
"I'm Saving Up MY Memory For When I Develop Alzheimer's"






78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles

 

If they're '69 heads, Autolite 35. It's a non-resistor, so if the MDS doesn't have a ballast resistor (it should) and you need radio clarity, go to a resistor in that range.

 

Sorry, if they're standard production '70 heads and not CJs.

 

George,
By MSD requiring a ballast resitor do you mean using a Blaster Coil or ignition box. I use a 6AL on my 460 with an Accel Super Coil and was told not to use a ballast resistor. Sorry, I know this is off the original topic.
Baja

 

Sorry, I run Mallory Comp 9000s and I'm not familiar with MSD or Accel. Maybe they have built-in resistors so they can run non-resistor spark plugs? Seems silly to spend money on getting a big, hot, reliable spark and then stifle it at the plug. I'd check with MSD or Accel.