Originally Posted by painted jester
Ive torn down engines after setting for years in the woods that had lifter that still held their pressure!
If you found engines in the woods that are still holding the valves off the seats, the engine wouldn't have run in the first place, and there's a lot more to be worried about than the lifters.
I don't know what type of lifters you use, but I can take any of the new lifters I have here (Edelbrock at the moment), pump them full of oil and put 50 lbs on them and they'll bleed down.
Edit- I had to go back to see what even brought this all up in the first place. Seems it was because someone said that pumping up lifters would destroy the engine. The reason I posted in the first place was to put that notion to rest- NOT to say "pump up lifters". In fact you'll never hear me recommend it. If it has to be asked whether to do it or not tells me there's no experience w/doing it.
But one problem that new builders have is feeling when they're at zero lash. Hard to do even when jiggling and not twisting the p-rod until you know what to look for. So a lot of guys get this wrong- and end up bottoming the plungers and then adding preload, lifting the valves off the seats. Then the engine cranks, and cranks, and cranks w/o starting up. So if having the valves off the seat for a revolution while they bleed down (even if this was necessary) will delay starting, what will having the valves cranked well and truly off the seats do?
When the lifter is full of oil, one thing is sure- you can feel zero lash.