1968 Solar red GTO
A new engine can run a little hotter because it has to "loosen up" a bit, but not much hotter.
What oil weight? Oil is also a means to cool and engine. Thicker oil may not transfer heat as well as lighter oil. Just a thought.
Yes, you want 1/2 in and 1/2 out as the typical positioning. You can get a spacer to move the fan closer toward the radiator and into the shroud. That may be all you need.
Radiator should do the job at the specs you have.
Get a hand held laser temp gun and shoot the radiator at the top and the bottom to confirm radiator temps and there should be a noticable difference. This will also verify your gauge and can save a lot of head scratching and time if it is a gauge/sending unit issue/mismatch.
Your belts could be slipping and not know it. I have had that experience. The pulleys have a specific V angle and some of the replacement belts are close, but no cigar. They can be too skinny and not grip well, or even drop too deep and ride on the pulley center rather than the sides of the pulley. The belts that seem to be correct are the Dayco brand Top-Cogged belts.
I have always tightened my drive / accessory belts incorrectly (no gauge). I am installing new belts on my 65 and would like to buy a belt gauge. Do any of you use a belt gauge and if so, which brand and model ? The local tool stores don't have one, so I am looking online. Thankswww.gtoforum.com
Other things are the amount of slip from the clutch fan unit. The HD units will slip less at lower RPM's, but drag more into the upper RPM's - so pro's and con's for the real HD units. Hayden is the brand that most seem to use and I myself have used them with no issues.
The fan blades can be made at different pitches, More of a pitch/angle will cut more air at the lower RPM's.
Again, get the timing dialed in to eliminate that.
Definitely using way too much gas, in my opinion. Not good because you could be "washing down" the cylinder walls of oil and not good when breaking in a fresh engine. If you had a real healthy engine, or 3.90 gearing, I can see 10MPG's. I think you should be doing a little better.
So get that squared away as well.
I’m running the recommended 20/50 ( with zinc) frost least the break in period
Ill get that spacer- good idea, it needs to be further into the shroud i think
Ill check the belt too, that’s an easy thing to check
It’s geared at 3.55- it did a lot better before on mileage, ill check the oil for gas too
My friend recommended a straight (non clutch) flex fan, what do you think there?