Rocky_LC

The first thing we checked was that the engine was not seized. It turned over easily by hand. Too easily, in fact. Did a quick visual on the timing and filed off a little nub that had developed on the points contacts, poured a little two-stroke...

OK, after wrestling with the design a bit (mostly getting comfy using Fusion 360), I have a prototype design that uses 1/8" NPT brass fittings and brass M6 heat inserts. Ordering some parts / taps and will be printing out the first prototypes...

I used this chart this morning.

At 450 degrees your coolant WILL be boiling out the overflow and you WILL have a cracked head and you’d probably already have burst the rubber coolant lines. Whatever you are using to check that temp is wrong. I would bet you aren’t overheating...

I didn’t think so either, I’ll try and get a pic next time. Fan is spinning the right way, and yes when it’s topped off it will dump out fluid for a while. Doesn’t sound like it’s boiling though.

It can’t be 450*. All good suggestions (above). The dollar bill trick (put a dollar bill on the front of the radiator to prove the fan is sucking) is a good test. Does it puke out fluid when you stop with a full radiator? Does it make boiling...

Oops sorry, must of made a typo and found myself in the wrong forum. Nice truck btw.