1. Nov 20, 2006 #1
   

   Seaweed Well-Known Member

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   Does anyone know what the octane rating on prem. fuel that was required for the 428 P.I. in 1968. I'm trying to get a mixture down , so that I'm not going overboard . In other words if it needed 98 octane rating , & the car runs real great , & no ping etc. I don't want to be in the area of 105. Thanks---S.

    

   Seaweed, Nov 20, 2006

   Seaweed, Nov 20, 2006

   #1
2. Nov 20, 2006 #2
   

   TLEA Well-Known Member

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   Re: Prem. Fuel
   
   Oddly enough the owners manual doesn't even list the 428 but does list the 390 4V and 427 4V hi performance as 99.8 octane requirement.
   Tim

    

   TLEA, Nov 20, 2006

   TLEA, Nov 20, 2006

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