pushrod vs overhead cam

[simplyzr1]

Mike, what makes the overhead cam engines better at top end and hold their speed for a longer length of time than regular pushrod blocks.

I know that the pushrod has been around a long time and they're put in trucks and haul heavy loads, so why wouldn't they hold up as long as far as endurance?:spin:

[MKOTZE]

Originally posted by simplyzr1
Mike, what makes the overhead cam engines better at top end and hold their speed for a longer length of time than regular pushrod blocks.

I know that the pushrod has been around a long time and they're put in trucks and haul heavy loads, so why wouldn't they hold up as long as far as endurance?:spin: Hi simplyzr1, Both the overhead cam engines and the pushrod engines if driven under 5000rpms for a lifetime would not show much difference in longevity. With the overhead cam the engine will operate at a higher rpm before the valves float. This occurs because there is less momentum due to the fewer moving parts and reduced weight. The LS1 and the LS6 have proven that the pushrod engines can still deliver plenty of horsepower. :chevy: MKOTZE