Thanks guys. Sorry to disappear for a few days. I'm building a 40'x44' pole barn and was desperate to get the roof on. Over 6000 screws later, it's on (obviously not shown in the old image below). I'm using Suntuf corrugated poly-carbonate roofing. It's pretty cool because it lets a lot of light in. However, it's a real pita to put on. Not sure I'd go this route again.
Back to the 425...the original engine is mounted to some spacers made out of thin wall tubing. These sit on a plate as shown in the photo below.
After some inspection, I determined the correct hole pattern for the Subarau 35 was already pre-drilled below the plate in the tub. Because a couple of the needed holes were close to the edge of the plate, I removed it with the intention of welding a larger plate in this spot. You can see in the image below that PT has holes for several different engines programmed into their CNC.
I used my lathe to fabricate more robust spacers out of DOM tubing and this got me thinking about proper engine mounts. Because the rear tub has several degrees of freedom to rotate and effectively use the tires for vibration suppression, perhaps PT felt it wasn't necessary to further isolate the engine. Still, I don't think it would hurt. The VD pump is fairly heavy plus the two additional pumps and hoses. I don't have a good way to get an exact measurement of the loads. Plus, as mentioned, the "front" mounts will bear a lot more load than the rear mounts.
At this point, it's a guessing game but I suspect a Durometer 60A or 70A might work.
