9T3VETTE

Going to start a cam swap soon on my 93 with 90k miles. I'll be putting on a new timing chain set but wondering if I should go ahead and replace lifters while i'm at it....

Thoughts?

Cjunkie

I would with 90k. if it had 9k I wouldn't since they are roller but 90k time to come out.

Tom400CFI

I wouldn't, if it were my car. Those lifters will go right on by 300k. Why change 'em at 90? Is there a service interval for them that I'm unaware of?

cv67

Wont hurt to check them doesnt take long at all

9T3VETTE

Thanks guys, seems like i could go either way. If I were to replace what i'm assuming stock replacements would be fine, however i've heard LS7 lifters can be used as well?


Can you elaborate a bit more....you mean checking operation of the plunger?

rklessdriver

Check the needle brgs by rolling the lifter wheel and making sure that it's smooth. Any grittiness or hitchs when you roll the wheel means replace the lifters.

Check the external condition of the lifter wheels for scratches or signs of damage/scoring.

Check the external condition of the lifter bodys for deep scoring or scratches.

You can't really check the hyd part of the lifter except to know they were quite before you took the engine apart and to make sure the plunger is at the top, up against the retaining clip.

If you need or want to replace the lifters use GM PN 12499225.

Will

9T3VETTE

^Thanks Will, appreciate the info. I'll confirm the condition upon removal and replace if necessary.

A Peter C4

New camshaft new timeing chain new lifters. Is this a greater lift cam? Maybe new valve springs? A must to replace lifters if old cam has any worn lobes.

Tom400CFI

OP has a roller cam...not a flat tappet. Cam should in no way, be worn.

Lifter inspection is a great idea, but at 90k, they should be ready to go another 100k more. At least.

A Peter C4

Roller cams can have lobe damage, I've been there, not a vette cam but a comp cam that had to be reground(race engine).