I had a few
options on engines. There was the original 350 lump but I also had a
pair of late 350 and 500 (507cc) engines, both out of low milleage
Excaliburs. These later engines have a number of improvements,
including Gilardoni (nikasil) barrels.
eventually get the original engine to run after cleaning something
resembling tar out of the carbs. It didn't sound too bad, but I
suspect it's had a hard life and could really do at the very least
with a stripdown and inspection. It also needs one of the exhaust
port threads reapairing.
I decided to
go with the 501 engine and do a little tuning. I had Alex at NLM port
the heads and lighten the primary drive. He also got the timing side
main bearing converted to a to a roller type for me.
I'm using an
NLM L5r cam and a pair of 30mm PHBH carbs. The ignition system has
been converted to the earlier CDI type, but with an NLM improved
pickup assembly and with my own 'transducer' boxes.