Evans waterless coolant

You'll get no support from me for Evans coolant. I consider things like that a gimmick to get your money and a crutch for an otherwise poorly set up cooling system. Nothing personal, that's just how I see it. I don't know what to tell you. I've never run anything but straight water or a mix of water and coolant, like I am now.

You may have read I've just recently installed a hot slant 6 in my 64 Valiant. Static compression is 10.1 and dynamic is 7.99. I had a small spark knock issue early on with hard acceleration, but managed to tune it out through several progressive steps. Colder plugs, blocking the heat to the intake manifold, a 160 high flow thermostat, and limiting total timing.

I had it at 15 initial and 30 total and it ran well on 87, but just was not "quite right". So I filled it up with 93, bumped the timing to 20 initial and now it runs very well. I don't have an aftermarket temperature gauge. I have the factory one. Now, even on the hottest days it only gets 1/4 way up after stop and go heat soak. Once out on the road it drops back down to the 1/8 mark.

Reading it with the infra red gun at operating temperature going into the radiator it's 179 degrees and 87 coming out. The radiator is just flat doin it. I have a stock four blade fan, but I'm probably going to swap it out soon for a solid five blade staggered blade fan "just because" I have one.

What radiator do you have? Normally, almost all over heating problems can be traced to a radiator that's just not efficient enough. Here's how efficient mine is. I HAD a high flow 195 thermostat in a while back. This radiator is so danged efficient that the engine never got up to a high enough temperature where the 195 thermostat ever opened. The only circulation it had was the tiny bleed hole in the thermostat and it STILL didn't get over half way on the gauge. I put a 180 in it and it dropped it to just under half. When I put the 160 high flow in it, that was the game changer. It never gets above 1/4 on the gauge and stays on 1/8 except in stop and go in the hottest part of the day and once back on the road cools back off to the 1/4 mark.

My engine has 175 PSI cranking pressure, so it's generating some heat. But with a very efficient cooling system I'm shedding it like nobody's business. You've got "something" not right somewhere. You shouldn't be having to use things like Evans. It's nice stuff, but if you find yourself HAVING to use it to get it to run cool, something's wrong.