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Old 08-04-2008, 10:14 AM   #1
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L99 heads vs LS3/L92

the L92 and LS3 share the same head/port design, can we assume that the L99 heads will also be the same as the LS3/L92's

looking to have a set of heads ready to go for the new camaro

thanks
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Old 08-04-2008, 10:23 AM   #2
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Elie or one of the other disciples may know, but no one has said anything to indicate they are different, but no one may have asked the question yet....
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Old 08-04-2008, 10:49 PM   #3
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Someone posted in another thread that the rev limiter on the LS3 is 6600 RPM while the L99 is 6000 RPM.

That either has to do with keeping the RPM's down on the automatic transmission(RPM's KILL an auto trans) or that the springs on the L99 heads can't handle the extended RPM band.
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Old 08-23-2009, 04:29 PM   #4
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Tranny RPM
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Old 08-23-2009, 06:10 PM   #5
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Nope, it's the AFM, specifically the lifters. The cam is milder, sonits not making power that high anyway
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Old 08-23-2009, 06:19 PM   #6
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Originally Posted by PatrickfromMD View Post
Nope, it's the AFM, specifically the lifters. The cam is milder, sonits not making power that high anyway
Yep your right... I found where the maximum shift sped is 6500RPM. The car stops making power well before that though.
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Old 08-23-2009, 07:14 PM   #7
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Yep your right... I found where the maximum shift sped is 6500RPM. The car stops making power well before that though.
The LS3? It is still making just under 400 hp at 6500 rpm, I wouldn't call that not making power. It may be past peak, but it is still more power than would be available at 4500 rpm in the next gear. The L99 is limited to 6200 rpm.
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Old 08-23-2009, 07:21 PM   #8
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The LS3? It is still making just under 400 hp at 6500 rpm, I wouldn't call that not making power. It may be past peak, but it is still more power than would be available at 4500 rpm in the next gear. The L99 is limited to 6200 rpm.
We are talking about the L99.
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Old 08-23-2009, 07:45 PM   #9
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whats a the l99 safe stock spring redline
???????????????????????????????????????
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Old 08-23-2009, 09:14 PM   #10
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Do me a favor, some one with an LS3 go out and see what the casting # is on your heads, then some one with an L99 go out and see what the casting # is on your heads. Someone suggested to me that the head casting # was different. We know the LS3 heads contain lighter valves...probably different valve springs also, as the LS3 cam's max lift is over .550 vs the L99 being less than .500, the LS3 CR is more, but only 0.3 more 10.4:1 vs 10.7:1.

But the new question, is...is the head design the same or different. It seems like L99's for the same mods are down more on power than just the what the drive train loss would account for. Saying that even with aftermarket mods (mods being equal...such as cam or whatever), its not right.

I emailed a couple shops that do heads, and asked if they had inspected any bare L99 castings vs LS3 but I got no replies.

Maybe its nothing...or maybe its something...it just "appears" that the L99 is down more power than what drivetrain loss will account for.
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Old 08-23-2009, 10:46 PM   #11
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Originally Posted by pharmd View Post
Do me a favor, some one with an LS3 go out and see what the casting # is on your heads, then some one with an L99 go out and see what the casting # is on your heads. Someone suggested to me that the head casting # was different. We know the LS3 heads contain lighter valves...probably different valve springs also, as the LS3 cam's max lift is over .550 vs the L99 being less than .500, the LS3 CR is more, but only 0.3 more 10.4:1 vs 10.7:1.

But the new question, is...is the head design the same or different. It seems like L99's for the same mods are down more on power than just the what the drive train loss would account for. Saying that even with aftermarket mods (mods being equal...such as cam or whatever), its not right.

I emailed a couple shops that do heads, and asked if they had inspected any bare L99 castings vs LS3 but I got no replies.

Maybe its nothing...or maybe its something...it just "appears" that the L99 is down more power than what drivetrain loss will account for.
I'll be back on friday and will post mine if no one else does. I'll I know is they use the same headers, I think.
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Old 08-23-2009, 11:05 PM   #12
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Quote:
Originally Posted by pharmd View Post
Do me a favor, some one with an LS3 go out and see what the casting # is on your heads, then some one with an L99 go out and see what the casting # is on your heads. Someone suggested to me that the head casting # was different. We know the LS3 heads contain lighter valves...probably different valve springs also, as the LS3 cam's max lift is over .550 vs the L99 being less than .500, the LS3 CR is more, but only 0.3 more 10.4:1 vs 10.7:1.

But the new question, is...is the head design the same or different. It seems like L99's for the same mods are down more on power than just the what the drive train loss would account for. Saying that even with aftermarket mods (mods being equal...such as cam or whatever), its not right.

I emailed a couple shops that do heads, and asked if they had inspected any bare L99 castings vs LS3 but I got no replies.

Maybe its nothing...or maybe its something...it just "appears" that the L99 is down more power than what drivetrain loss will account for.


I think I know who you talked to


yeah it appears the heads are different, I believe mine (and his) are 853s?

both L99s
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Old 08-24-2009, 06:05 AM   #13
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Quote:
Originally Posted by pharmd View Post
Do me a favor, some one with an LS3 go out and see what the casting # is on your heads, then some one with an L99 go out and see what the casting # is on your heads. Someone suggested to me that the head casting # was different. We know the LS3 heads contain lighter valves...probably different valve springs also, as the LS3 cam's max lift is over .550 vs the L99 being less than .500, the LS3 CR is more, but only 0.3 more 10.4:1 vs 10.7:1.

But the new question, is...is the head design the same or different. It seems like L99's for the same mods are down more on power than just the what the drive train loss would account for. Saying that even with aftermarket mods (mods being equal...such as cam or whatever), its not right.

I emailed a couple shops that do heads, and asked if they had inspected any bare L99 castings vs LS3 but I got no replies.

Maybe its nothing...or maybe its something...it just "appears" that the L99 is down more power than what drivetrain loss will account for.
According to GMHTP, the heads are identical. But as you said, it is possible there are some differences in the springs or valves. I believe the CR difference is due to the valve pockets in the pistons.
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Old 08-24-2009, 07:11 AM   #14
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Originally Posted by rayhawk View Post
According to GMHTP, the heads are identical. But as you said, it is possible there are some differences in the springs or valves. I believe the CR difference is due to the valve pockets in the pistons.
Truth...
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