It must be hell being unable to recognise an early bolt up subframe wideline frame. Mind you being old enough to recognise one is no better!!......A friend won vintage championships riding one with an old 77 motor stuck in it .....Later we had the bolt up subframe brazed on and it was used with a short stroke (68 x 68) 500 Dommy engine and untested taken to the Isle of Man as a standby for the Seeley G50 just in case ...which of course failed very early on so the Dommy was taken out for sveral practice sessions. Apparently the scutineers did not notice the difference!. ..it had never actually been run before doing those laps apart from a blast down the runway at Jurby airfield to play with the carb settings. Fellow riders following it around the course reported its handling at race speeds (for a 500 Dommy that is)'interesting' and with the motor at 8,000 over the Mountainn Mile etc the vibes resulted in the rider reporting the bars about 8 inches in diameter but it was as fast as many other bikes out there because some friends could not catch it...or hung back just in case the rider lost it!! It was planned a zillion years ago to cobble together a 90 degree crank 68 x 68 motor to bung in a new Domirace frame . I built the frame jig and two frames in 18 guage T45 were manufactured as was the crankalong with the crank cases etc modified to allow 4 through bolts from the head into the cases...88 barrels shortened and bored to 68mm tend to break beneath the second fin as pistons just kissed the head at high revs.... as we found out once!! its called a learning curve. As to whether I will ever finish it .........Alloy tank manufacturers are a total pain in the arse, never deliver on time and probably not to budget. Bit like BAE with its now OLD Type 45 destroyers for the navy........The first one was suppossed to be delivered in if memory is correct 2007 at a cost of 270 million each. I think the cost is now 1 billion each and according to Private Eye they dont wqork very well which with poxy politicians, the MOD and BAE involved does not suprise me!!
At various times in the early days Reynold Tubes who manufactured the frames for Norton would run out of 14 guage cold drawn seamless tube and use Manx 16 guage Reynold 531 to keep production busy till new CDS tube arrived. Friends in the know if they saw that frame at an autojumble would pick it up to see if it was a lighter version and if it was (AND fairly straight) buy it brazing a new Manx subframe on.