So luckily, I have two Evolution 7-77 motors in my possession. I've found by comparing the two closely, that one of them was supplied with no o-rings on any of the intake tubes... no wonder that engine was leaky as all hell and I had to use engine sealant around every intake tube top and bottom.

Just a heads-up for guys buying the EVO 7-77... take a good thorough look over the engine before accepting the new $1,300 + engine.

Also, on my 2nd radial engine ordered directly from Horizon, the front-cover where the 'Evolution Radial' is stamped is not aligned the same as most other EVO 7-77's I've seen where the 'Evolution Radial' is below cylinder #1. On mine, the UT 7-77 is below and in line with cylinder #1.

... look over your engines carefully guys. Seems the QC department falls asleep sometimes.