Collapsed lifter.

[Andrew]

Fresh build big block with lunati Hydraulic Rollers, the #8 cyllinder exhust lifter didnt pump up all the way. Anyone have any idea why? is it more likely a factory defect or an oiling problem? Any way to tell by taking the lifter apart?

 

[RustyRatRod]

If you still have it together and running, try a quart of transmission fluid in the crankcase. That's magical stuff. It may have a piece of trach or something in the lifter and a LOT of times transmission fluid will help clean it out. It won't hurt a thing.

 

[Someotherguy]

I'm a huge fan of marvel mystery oil for lifter issues...

 

[RustyRatRod]

I'm a huge fan of marvel mystery oil for lifter issues...

Yes sir! It works good too. And get this......stupid a name as it is, I REALLY like Sea Foam. That stuff works good at cleanin fuel systems.

 

[Andrew]

I'm tearing down the engine because the block is cracked. I'm pretty sure Discount Performance or Lunati will replace the lifter, but I really was curious about why this happened. hopefully not an oil issue. I'm changing blocks but other than a high volume pump, no oiling mods were done.