To late Asked some questions for you at work today.
Ok here goes, rough guide to the prices you could expect...
A Griffon 58 (Most common)
Contra rotation Prop
In Box "0" timed with Log Book
£20,000 to £25,000
Without Logbook
£20,000 down.
Griffon 60 series (Single Prop rarer)
Time Ex (500 Hrs) I.E just out of a flyer with Logbook
£20,000
"0" timed in box with logbook
£30,000 to £35,000
Griffon Ready to Go overhauled with paperwork
£120,000
Merlin approximately the same as the above prices...
Griffon has the cam drives on the front of the engine, the
Merlin on the rear..... These are like cast tubes on the case running up to the rocker housings.........
Data plate giving model etc on right side of
Griffon crankcases.......... Left on
Merlin....
Hope these help, now lets see a picture