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Old 12-30-2012, 09:47 PM   #87
Loose Pre Unit
motu's Avatar
Joined: Dec 2001
Location: New Zealand
Oddometer: 4,591
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 ?
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