R5 -RD350 conversion

[Still biking]

Years ago I bought a bunch of parts and engines from a very experienced RD person who raced and rebuilt bikes  and it included the following item.  It was an R5 engine rebuilt with RD350 cylinders (ie reed valves).  What piston would be used in that unit to have the correct compression ratio?  It has .75 over pistons when I take the head off.  Could an RD350 piston be used in such a set up?   or does the height of the top of the piston to the wrist pin differ between the R5 piston and the RD 350?

[Jspooner]

He should have used RD pistons.

[m in sc]

r5 and rd pistons are pretty much identical aside from the rd ones having the boost port windows in the intake face.

[Still biking]

Can you just bolt up an RD top end ( RD cylinders, heads, pistons, carbs, etc) or do you have to do modifications to the pistons or cylinders to make that work?  I am wondering how modified the parts that are on this engine may be.

[m in sc]

bolts right on. no mechanical mods needed.