AFR at cruise vs head temps, and an oil leak ? too Options

[agrump]

I kind of freaked this morning because my head temps this morning were at 400f on #3, 380 on #1. After awhile I remembered that the gauge is calibrated for 70f so the real temp on #3 is around 365. I am still wondering if this is too high for just cruising on the hwy at 65-70 mph. I pulled the plugs the other day and 1,2 and 4 were tan with some deposits but #3 was white with just a very light coating. Going by the receipts I got with the car my engine is a 2056 running a 280 degree cam (Fat 442), 96 "euro" pistons with TS rings. I’m not sure about the static compression ratio but I did check with a gauge and found all the cylinders to be within 112-120 psi.

I’m currently running 13.7:1 afr, should I make it richer, say 13.0:1? The car use to have carbs and the afr was around 12.0:1 but I didn’t have my head temp gauge then.

One more thing, the motor runs strong but has a mysterious oil leak, doesn't leave puddles, does show any obvious signs of burning or dripping but the oil level drops significantly every once in a while. I had the head vent hose attached to the wrong nipple on the air cleaner so it may have been pulling a vacuum; I’m not sure if moving it has worked yet. Jake warns against using TS rings so I wonder if that could be the problem.

Thanks

[DNHunt]

I just went through a scenerio similar to yours. The plug in #3 was very light. It turned out to be bad injector with only 110 miles on it since new. Mine was lean with more throttle and fine at cruise.

I have mine set up to run with a target of 13.7 at cruise in cloosed loop.

Since my FI is batch fired and each injector fires twice per 720 degrees, fuel sits in the manifold and I was able to swap the injector wiring around so bank 2 was really on the bank 1 injectors. (Does this make any sense?) Anyway, the problem did not follow the wiring. Fuel pressure was OK and fuel was returning to the tank so fuel volume was OK. That kind of left the injector. Swapped it out and the problem disappeared.

I hope this helps

Dave