Lone Star Stangs | The Texas Mustang Club - View Single Post

keg65 · 01-20-2007, 04:30 PM

69 was still running Regular lead gas.

If the heads have ever been rebuilt, they would have added the hardened valve seats. If so, run the lowest octane it will take.
These are of course easy to adjust timing to work with any fuel. If you get "pinging" with 89 octane, just back off the timing a bit.

I'm not sure about a lead additive for original heads, I'm sure someone else will chime in...

01-20-2007, 04:30 PM	#2
keg65 Change always makes Sense (or Cents) Join Date: May 2005 Location: NE San Antonio Posts: 1,273 Trader Rating: (0)	69 was still running Regular lead gas. If the heads have ever been rebuilt, they would have added the hardened valve seats. If so, run the lowest octane it will take. These are of course easy to adjust timing to work with any fuel. If you get "pinging" with 89 octane, just back off the timing a bit. I'm not sure about a lead additive for original heads, I'm sure someone else will chime in... __________________ 1 of 472 Year 2005 Mustang GT, Black, Convertible with Black Top, Automatic Transmission, Dark Charcoal/Red Interior.