Originally Posted by motu
Valve train has always been the limiting factor with pushrod engines, that's why ohc is now the prefered option. But plenty of pushrod engines can be made to rev well, some even stock. I used to rev the unit 500cc Triumph twins to over 10,000rpm, completely stock. So if it's happy at 8,000rpm with no valve float issues, that's still safe on these engines - the bottom engine is up to the task ?
Was thinking the same thing ... lighter stronger materials are now being used in Triumph valve trains, the Trident owner at the track was horrified when I told him BMW ones were nearly a foot long..... he gave me some places that make custom ones in the States that don't flex.....mind you how long is Triumph one...4"....?