Early Picco P45 head shim

[Kez]

I have enough parts to build a Picco P45. The parts I have are for the first generation P45 where the head button sits on top of the liner. The case has no fins on the exhaust stub and it has a drum intake. I believe all Picco after the first generation has the head button intrude into the liner.

It's been almost 40 years and I cannot remember if there is a head shim between the head button and the liner. If there is one, what is the correct thickness? Will the head shim for the late model 45 fit?

Thanks, k

 

[NITROSNIFER]

Yes there is a shim for setting head clearance and sealing the combustion chamber. I don't have any specs on it but if you were to post the OD/ID of the head where it sits on the cylinder liner I'm sure someone will have one. All my Picco's are lat model versions and i don't recall if they are the same.

 

[Patrick Au]

I have some Picco head shims (0.1mm & 0.2mm) which the ID is 21.8mm. The bore size is nearly no changed since 80's models.
0.1mm is $1.60 each and 0.2mm is $1.75 each plus shipping.
Thanks, Patrick