O.K. I kinda thought that might be the case.
It's interesting, over the years there have been many Engines built that are "just right"
The small block Chev, Iron head 900cc Sportsters, Austin/Morris 1100 (U.K.) 650 Bonneville's.
These all have just the right bore/stroke/rod length compression ratio and valve size.
I've been building M/C Engines most of my life, mainly because I rode them hard, blew them up then had to learn how to fix them
The bike that I had before the Rocket is a 1975 T160 trident, this is out to 1000cc's, Carrillo rods, mega-cycle cams, special one off flat top pistons, (originally the old triples had high dome pistons, not good for flame propagation, all the bells and whistles.
I had the big ends on the crank submerge arc welded up, and then using a friends Engine shop I reground the journals 6mm off-set, increasing the stroke by 12mm.
This along with 4mm bigger pistons gave the engine the same bore and stroke as the Bonneville, just I had 3 cylinders not two
To say it went like a cut cat is an understatement.
I cast my own "
TRIDENT1000" side cover badges, machined the wheels to suit the stock Triumph axels, bearings, disc's etc.
Stock rear sprocket is 50 teeth, I'm running 38. It pulls this like a stock Engine pulls the stock gearing.
I broke a few bits along the way.
All good fun