Drained old gas and put in 7 gallons on non ethanol gas from Buccee's
Pump said 91 regular
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EDIT: I think Shell regular is 87 .....Been running regular from Shell, was running great with 12 BTDC
With the non ethanol I had to crank the timing to 20 BTDC
Runs great, starts fine, no ping in hi gear at 25 MPH with pedal to the floor
352 is original to the 65 F100, factory pistons, heads are C0 and C1 ( machine shop switched heads on me 25 years ago )
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Had a 67 Barracuda with an 8 to 1 360, filled it up with av gas and had to crank timing way up just to get home
Am I wrong in thinking the Buccee's gas is higher octane than the Shell regular or is the ethanol diluting the Shell regular perhaps ??
Ricky.