OK, so I started tearing down my 2nd 2.5 tall deck motor tonight. It's only been on the stand since last May.
I got the head off and was surprised to see that it's a tappered shroud head. But, it's not crossdrilled. And, it has a slider cam with a square tooth sprocket. I know the 87 2.5 had the square tooth belt. But, I was surprised that it had the slider cam - I thought they were all roller. And, I was surprised to find a non-crossdrilled, TS, 782 head. I'm 99.9% sure this thing has never been apart. Aside from the grime and sludge, the head is in very good condition.
I wonder if it has turbo exhaust valves? How could I tell?