[33gold]

I thought I'd start a thread as when I started this project I really struggled to get info, the local Alfa specialist had never known anyone do this.

The issues so far:

I.e heads have combution chamber, 1.5/ early 1.7 do not.

Valves need to be longer than the i.e. but slightly shorter than the 1.5 twin carby / early 1.7 carbie - solution grind them back as the collets/clearance are still OK.

compression is lower on i.e (9.0) versus 9.5 on carby (so you assume as there is a dished piston that you can reface head by a fair deal?

I found out that with 300 degree cams the valve hits the piston (I was testing with some clay on the pistons) as the duration means that at TDC on the exhaust/inlet phase is quite large - solution make a recess in the piston for the valves; I have gone as large as I safetly can before I get to the first ring groove. Now need to cc the head and piston to work out compression and calculate how much to take off the head - I have about 3mm clearance.

Does anyone know how much rod stretch/piston expansion you are likely to get so I can take this into account?