Thankyou all for the information l think I will get them measured accurately then go from there to see if anything is similar and possibly machinable to fit

Thankyou all for the information, it’s an industrial engine that apparently shares the same big end shell bearings as an arial either 500 twin or sq 4 it’s early days of the restoration so everything is very new to me l really appreciate you taking the time to reply and help me with my seemingly ...

Great work well done

Thankyou l will look for Drags they’re for a 1954 BSA 420 cc that’s the power unit for the Trac Grip I’ve just bought l love forums like this as l find all engines interesting and the talented people that post their work.

Good evening all,does anyone have a pair of big end shells stamped 1426M they would be willing to sell please?