I was wrenching on my Weber this morning trying to get the truck running after a bout of the usual 'shit in the jets' problems I had last night.
Ran the motor, warmed it up, adjusted the idle mixture, turned the truck off.
Now I've been noticing for some time that I've been getting bubbling that sounded like it was coming from the gas tank whenever I shut off the truck after a long drive.
Welp, heard it again. Turns out, it's coming from the radiator. I opened the cap and I have a fuck ton of foam in the radiator. Question is: What causes this?
Naturally the first thing I thought was head gasket.
-No oil in coolant
-No coolant in oil
-No coolant in the exhaust
-No sweet smelling exhaust
Basically, NOTHING supports a popped head gasket except my compression test. I found 120PSI on cyl 1, and averaged 160 on 2,3,4. However, this was also the first compression test and the motor has less then 1000 miles on it yet, and hasn't been giving me many issues at all. Most were carb related. It's highly possible that the rings haven't fully seated on cyl 1.
With that said, it was overheating at one point, if you recall it was because if carb jetting being wayyyyy too lean. That's been fixed.
I've done a little reading and there are tons of theories out there from coolant contamination, etc.
http://www.nastyz28.com/forum/showthread.php?s=30c5f07dbfa840c35a94393623b44132&t=12874&page=2
^This guy found running no t-stat was his issue. I'm actually not running a t-stat at the moment either. I suppose I need to go toss my 160 back in.
EDIT: For relevance, I'm using a FelPro gasket on a close chambered A87 with a C/R of about 9.5:1. I have a NISMO gasket sitting next to me, and plan on putting it in. Just gotta get a timing chain first since we re-used the old one. (Kit we had was for the wrong motor)