I think he installed the heads three or four years ago if I remember correctly, the compression should be around 125 lbs if the exhaust relief holes are left open, and 140plus if they were filled, I think he left them open if memory serves, I think he has also removed the oil injection(VRO) and gone pre mix witch is a good safety factor on these too.I updated mine to the newer 4 wire VRO, Mark has since bypassed it and pre mixes.Setup like this they will run almost forever. fuel milage around 6500rpm is alarming, as with most of the carb motors LOL but fun! I ran an OMC 3 litre looper on my last boat V8 charged ownes it now, the 17' Panther with the 3 liter looper, I also had 2.7 heads etc. the vegas xt is still made Eric, John Spaeth still has the molds, the AE-21 is a tri marin and the V-kking a v-pad, people call these an air entrapment v, they ride flat compared to the V-king, more like th ae, I have only ridden in the 18, Valero xt. I would say this would be a great combination of power and hull, the OMC's go a long time between rebuilds as long as you don't run them lean. The one thing I would check very closely, as with any boat made is their time is the transome and core/bottom, there is no sure tell , but take a rubber mallet and listen and look for de-lamination bubbles cracks in the transome,and put some weight on the motor cav plate and watch for transomme flex, if all looks well, this one looks to have been kept out of the weather. he has it set up very well too. give me a call @ 416 526-9889 or
stephen.hobberlin@bell.ca if you want to have a chat Eric.
Steve