Pre-production parts list

Here are a couple more to keep the thread alive. These are from the Engine & Foundry SK log book.
SK37357 - prototype , became C8VE cast iron ( stock) head 5-5-66
SK42034 -pushrod , same as C8VE 6565-A except hardened for use with guideplates 3-16-68
SK42037 crankshaft same as C8SE 6303-A except bob weight 3045 gr. 3-14-68
SK42039 valve same as XE144020 except titanium material (TRW) 3-14-68
SK42040 " " " " " " " ( Eaton) 3-14-68
SK42041 " " " " " Aluminum material ( Eaton) 3-14-68
SK42046 thru 42049 lash caps variuos thicknesses 3-19-68
SK42091 head 427 CanAm ( caliope engine 385 based , not FE) 4-18-68
SK42092 " " " " "
SK42095 block assy 427ci aluminum "FE" type 4-23-68

There are ten new ones.

XE144201 for the iron boss 429 heads
Both heads stamped RA

Hypothetically if someone found one of these XE engines complete what are they worth?

The problem is "what is it"? Experimental engines built at Ford were given RX numbers ( RX386 was one type of Boss 429 build) so the list of parts used was documented. That was noted by a sticker on the valve cover. Test or prototype engines didn't always work according to plan . Some of these engines went into storage , others were "scrapped out". Value depends on potential and rarity unless you are simply looking for wall art or a display engine. Some SK/XE parts are expensive and others worthless. It's important to remember that "at one point" even a 6 cylinder production engine was built from XE parts before the production casting numbers were assigned. I've seen MANY common parts with experimental numbers on them for that exact reason.
Randy

Thanks, I'm not talking about anything super fancy like a Boss or Cammer motor. Lets say a 429CJ complete stored since the 70s. Has anyone ever seen one of these motors sell? I would assume they are rare and worth a little, but not Boss money.
XE-149125