Pretty interesting, don't know if this is a re post.
But really worth a watch.
Does plumbing the rear of both Pontiac Heads help the engine's temperature? Only if it's plumbed correctly! Check out why it works... It'll blow your mind, and not your head gasket. In addition, I also show you the Correct way to install AN fittings.
In this episode, "Pontiac Head Cooling Trick - Part 2 Keeping Your Heads Cool" I'll diagram the Pontiac Water Flow, and what I did to help it... or, did I hurt it? We shall see! Enjoy!
https://www.youtube.com/watch?v=v_qUY4E33r0