why L92 s drop valves?
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TECH Senior Member
Joined: Jul 2009
Posts: 8,032
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why L92 s drop valves? Hi all. I might have the chance to get a 08' Caddy 6.2. I've heard these are prone to droping valves.
What would be a easy fix? I'd prefer not to have to remove the valves for wightweight pieces.
Would switching to a quality aftermarket valve spring be a solution or must the heavy valves be replaced ???
thanks,
Jim
What would be a easy fix? I'd prefer not to have to remove the valves for wightweight pieces.
Would switching to a quality aftermarket valve spring be a solution or must the heavy valves be replaced ???
thanks,
Jim
the one engine failure Ive seen broke the valve at the bottom of the keeper.
I have not seen another one, Im kind of surprised that this motor has such a bad rep.
I work at a obama motors dealership and rarely work on these.
I have not seen another one, Im kind of surprised that this motor has such a bad rep.
I work at a obama motors dealership and rarely work on these.
The main cause of valve train failure is loss of control. Properly setup I don't think the L92 heads are any more prone to failure than any other stock component head. I run stock L92 valves and have for about 15k miles. I also run PAC 1521 springs, Manton 11/32 pushrods and YT Ultralight rockers - all setup properly. My cam has .660 lift so it's not like the system is unstressed.
The main cause of valve train failure is loss of control. Properly setup I don't think the L92 heads are any more prone to failure than any other stock component head. I run stock L92 valves and have for about 15k miles. I also run PAC 1521 springs, Manton 11/32 pushrods and YT Ultralight rockers - all setup properly. My cam has .660 lift so it's not like the system is unstressed.
I run the stock valves on my L92 heads to 7k all the time. I use the stock rockers with Patriot xtreme dual springs. About 7-8k miles so far at .600 lift.
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TECH Regular
Joined: Dec 2004
Posts: 440
Likes: 0
From: Alpharetta, Ga
I ran the stock LS3 valves on Comp 921's/stock rockers w/ a 231/243 .617/.623 115LSA cam for 10k miles with no issues. Matter of fact, I even had a TC failure and almost all the valves hit the pistons and the 2 piece welded hollow stem intake valves just bent and did not break. I think these valves are much tougher than people think and would wager that most valve failures come from valve float or a production flaw.
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