Hi Jim,
I am not an expert on C60X or C15TA engines, but I have rebuild a Staghound AC which took me 10 years to finish, so I know something about the engines used in this car.
Serial numbers start with ACL-1001/ACR1001.
Don't know how many engines were made but I have a (spare) engine with serial ACL-9306.
Actually, there is no difference between ACL and ACR stamped engine crankcases.
The main difference between L&R engine assembly's is the location of the generator but ACL as well as ACR stamped cases have lugs on both sides to mount the generator.
So you can take an ACL stamped engine and assemble a right hand version from this.
Both engines have the same (right-hand) rotation.
Pistons, connecting rods+bearings, main bearings, camshaft gears and cylinder heads are the same as used on GMC-CCKW engines.
All the rest is different.
Stag standard piston no is G122-03-38698, ORD A281976, YT-2136841.
The standard GMC CCKW piston is exactly the same piston, although the part number may be different.
The Stag crankshaft uses a 4-bolt rear main bearing and has 8 threaded holes on which the flywheel is fixed.
It has an extended "front end" suitable to mount a double pulley to drive the (very important!) generator.
Exhaust-valve clearance is slightly bigger (at 0.016") because of the engines running hotter in the enclosed engine compartment.
Stag exhaust valve number is G85-01-02421, YT-2135403.
Stag engines are not governed and due to the specific parts as camshaft, carburetor and ignition, run up to 4200rpm.
A Stag can do 62mph.
At least, mine does...
Best regards,
Marco
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