The version of the Evans that they run in the nascar stuff is slightly different than the stuff that you run in street vehicles. The strictly racing stuff( NPG ) requires some modifications to the engine, it's a slightly different animal, the street stuff ( NPG+ )has most of the same properties without having to go through all the modifications
The racing stuff requires high flow thermostats, high volume water pumps, etc ad nauseam.
About the only thing they reccomend doing with the + is taking a dab of silicone and plugging the weep hole on the water pump. Can't remember the reason. Think it had something to do with it gathering air at that point on non pressurized systems, whatever, takes ten seconds to do.
The nice thing about mail order is you can always have the stuff sent to you on the road, and , if you call and talk to the manager ,you can have stuff sent ahead to a truck stop if needed, or to a motel that you'll be staying at.
The nice thing about a zero pressure system is even when something cuts loose, it's not as bad . When I had the freeze plug walk out of the rear of the block, we were a couple of hundred miles from home on vacation and I discovered it after a day of fun at an amusement park ( lovely trail of liquid under the truck ) but with zero pressure I was able to top it off, drive to a parts store, dump sealer in it, fill it the rest of the way ( in an emergency the stuff is compatible with the Low Tox antifreeze run straight in with it, so I grabbed every jug I could get my hands on, you don't have as high a boiling point, but with my radiator, no problem ) hooked back up to the 5er ( all 10k pounds worth ) and dragged it back over the Ozarks and safely home.
Once everything was unhooked, and cooled down, I decided to have some fun with it and put a pressure cap on it , 7 lb to see how long it would last. Soon as it got up to temp, that rear freeze plug shot out.
but as I have said, many times, it's cheap insurance.
