Need to see the RC Valves/exhaust ports to be certain really.

All the heads are MC16.

dscn2246hf.jpg is an MC16 piston.

Looking at dscn2266o.jpg it would appear you could possibly have one MC18 barrel too. dscn2247ek.jpg is also a later-type piston.
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Andy.
NSR-WORLD.COM

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