do we always assume BSA fitted parts superior to Wassel ??
The (very) experienced machinest who did my engines bottom end reckoned the plain bush set up was fine for 100,000 miles for GFs, Super Rockets etc, but engines tuned to give significantly more power and revs than std would benefit from the roller conversion, not so much for longetivity but to avoid blow ups.
John does not know many A10 engines he’s line bored etc, but it’s over a hundred.
I know a guy who did 35,000 Miles on his GF, built by John, and when he had to strip it down (due to cam wear, he didn’t replace that
) the big ends and mains were “as new” so left them alone and just replaced the cam and followers.