No, I didn't get it yet... The temps got up to 50F here, so I didn't have any problems getting the head up to the proper temps. I ran about 6-7 tanks through it and it's a total monster in the revo. I need to gear it up more or I'll be eating diffs. Even with 15/36 and the 3.3 chassis, I get wheelies when it hits second... I can't even attempt to punch it off the line or it just flips on it's roof.
I need to redo my roll bar though as I rolled it and hit the head, which shifted the engine a bit and destroyed my spur. At least I was able to get a good portion of the break-in done.
I'll probably still try that head to see how well it works if it's any smaller. Even with a taller roll bar, I'd like the head to be shorter.