I don't think you'll have a problem with a J spec piston engine, but the rotary engines seem to be piles of **** 7 out of 10 times.

 

corksport is closed right now, so i'm unable to get ahold of somebody, but just give them a call, and ask them what they mean by they check the engines... i mean, i would hope that a company as reputable as they say would have the cortousey to compression check your engine for you before it's shipped out. ton's of people use corksport, so personally, i wouldn't get too worried, and just by felix's opinion, i'd take a guess at it being rotary engine exclusive. relax, give them a call and make sure.
Corksport Phone # (503) 252 - 5700
peace

 

Well I've got my engine so I'm not too concerned with it to call