Maximum rpm for oem lifters

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Oct 16, 2007 | 09:48 AM

94sc383

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Joined: May 2007

Posts: 265

Maximum rpm for oem lifters

Will stock ls1 lifters(40k) handle 6500rpms?

Oct 16, 2007 | 11:14 AM

Capn Pete

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Joined: Jan 2002

Posts: 5,308

From: Oshawa - Home of the 5th-gen

Apparently! ... I've spun mine up there a couple of times

. AFAIK, it's the springs/push-rods that are the "weakest links" in the valvetrain

Oct 16, 2007 | 04:26 PM

Bayer-Z28

Registered User

Joined: Jan 2005

Posts: 2,592

From: N Falmouth MA

^ Yep.. You'll risk bent pushrods revving about 6500.. One thing to wonder too is "lifter pump up" under a high RPM situation. I've been asking about this for months on a couple boards. LS7 lifters specifically.

Oct 17, 2007 | 08:13 AM

Kraest

Retired

Joined: Oct 1999

Posts: 3,166

From: Inside Uranus

They'll handle 6800 with no problem. I used OEM replacements on my heads/cam motor.

For a more serious buildup, I'd recommend the Morel lifters when you're spinning 7000+.

Mike