Reply to "Coolant or gasoline in oil?"

jb1490Member

Carlo,

You really should consider having hardened exhaust valve seats installed in the heads, as the stock heads are not "compatible" with unleaded gas.

I walked into my local machine shop the other day, and as I entered, I saw this set of Ford heads sitting by the counter. The exhaust valves immediately caught my eye. They were sunken almost 1/4" below the tops of the intake valves! I joked with the machinist about them and he said that the owner couldn't figure out why the engine kept loosing power. I don't know how many miles were on the heads.

The torque on the head bolts is 95 to 105 ft-lbs. Torque in sequence to 50 ft-lbs, then to 60 ft-lbs, and then to specs (95 to 105). Disregard any info that says that you don't have to retorque. Retorque the head bolts after the engine has been thoroughly warmed up. I followed the procedure above and thought about not retorquing, but changed my mind. Torque had dropped to 80 ft-lbs! RETORQUE!

John

12/7/097:55 PM

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