Keith,
$1500.00 will get you STC paperwork, drawings, a nosebowl and a gross weight increase. That's it. You scrounge for the rest of it.
8-9k will get you the following, same supplier, same pieces, just a few more pieces and cubic dollars. Same as you were quoted:
As per David Roland's conversion process he went thru a few years ago, here's his accounting of what he received when I posed the question:
Paperwork and a big box of parts.
All the drawings for 2 STCs, one for the 150HP conversion and one for the Sensenich propeller and a different muffler. The conversion now uses a more conventional round muffler.
Most all of the parts needed for the conversion minus the engine, engine related accessories, and propeller.
Things like:
engine mount
spinner
battery box shelf to relocate the battery behind the baggage compartment.
circuit breakers
fuel pressure gauge
electric fuel pump
switch for electric fuel pump
battery cables
wire
scat tubing
baffles
carburetor air box and filter
fiberglass nose bowl
oil cooler
I think there were some oil lines and fuel lines included as well as some miscellaneous hardware.
I can't remember what all. It's most everything you should need. But then, no two planes are alike and tearing into a 40+ year old plane is only going to turn up some additional things that need to be changed or corrected. Harry put together the kit based upon my plane's serial number. Some stuff was added and other stuff left out of my kit because of my answers to Harry's questions regarding my plane. We got everything we should have in the end.
A lot of the parts have to be custom made for the STC. Del-Air manufactured the engine mount, spinner and most of the sheet metal parts. The parts were all of good quality.
You've already got the engine mount for an 0-235, so it's the same mount for an 0-320. Now, you'llhave to start searching thru the junkyards, saving money, but not time.
