Valve guide life with .700+ lift cams?

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
427dart
Expert
Expert
Posts: 910
Joined: Thu Apr 02, 2015 3:23 pm
Location:

Valve guide life with .700+ lift cams?

Post by 427dart »

For street/ strip use how many miles do you see before guides need replacing? This would be on a typical high quality aluminum performance head.
ProPower engines
Guru
Guru
Posts: 8686
Joined: Sun Jan 21, 2007 1:16 pm
Location: Victoria BC Canada

Re: Valve guide life with .700+ lift cams?

Post by ProPower engines »

Depends on guide material quality
Amount of stem run out
Guide finish honed or reamed and amount of clearance started with
And how well the geometry was set up to start with will determine how long they last.
But in a perfect world where attention to every detail is paid if the engine lasted I would say about 30K miles
Real Race Cars Don't Have Doors
mag2555
Guru
Guru
Posts: 4584
Joined: Sun Sep 18, 2011 11:31 am
Location: Heading for a bang up with Andromeda as we all are.

Re: Valve guide life with .700+ lift cams?

Post by mag2555 »

Just in general if the valves you use do not have good hard chromed stems and the motor is ring wise letting excess oil being burned then you will experience pretty fast Exh valve guide ware.
You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you!
Post Reply