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L92 Head?

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Old Oct 19, 2009 | 06:43 PM
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Default L92 Head?

How many of you are running L92 heads vs a set of LS3 heads? I know they are the same my main question is about the valves in the LS3's being lighter. Anyone with L92's had any valve float problems at high rpm's?
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Old Oct 19, 2009 | 06:53 PM
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define hi rpms
valve float will occur in any engine that is not equipped with correct parts.
if take into account all the variables when selecting springs and valve train should have no float.
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Old Oct 19, 2009 | 06:56 PM
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Not here. I have ported l92's w/stock valves w/comp 921 springs. My 402ci peaked at 6,400rpm's and the rev is at 7,100. No issues at all.
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Old Oct 19, 2009 | 06:56 PM
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Originally Posted by NemeSS
define hi rpms
valve float will occur in any engine that is not equipped with correct parts.
if take into account all the variables when selecting springs and valve train should have no float.
No more than 7500 i'm sure. I know how valve float occurs, I was just curious if anyone had thought or had any experiences with a set of truck heads vs LS3 heads.
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Old Oct 20, 2009 | 02:32 AM
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Originally Posted by NBM99SS
No more than 7500 i'm sure. I know how valve float occurs, I was just curious if anyone had thought or had any experiences with a set of truck heads vs LS3 heads.
No experience given we run mostly L92 stocks and are careful, but I imagine that GM would not have gone to hollow stem intakes unless their engineering standards dictated it to reach their power/rpm objectives and/or marketing thought it would be a good selling point. .
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Old Oct 20, 2009 | 06:53 AM
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Im running stock L92's (aftermarket springs) going through the traps at about 7200rpm 9.48@141.05
61 runs so far and no issues.
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Old Oct 20, 2009 | 06:58 AM
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Originally Posted by Rock_Daddy
Im running stock L92's (aftermarket springs) going through the traps at about 7200rpm 9.48@141.05
61 runs so far and no issues.
Thats impressive. Stock rockers and pushrods too? Which springs?
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Old Oct 20, 2009 | 07:01 AM
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Originally Posted by rsz288
Thats impressive. Stock rockers and pushrods too? Which springs?

Stock, lifters, pushrods, rockers, valves. No port work.

I am not sure exactly on springs, Ill have to ask my builder but they are enough for a 24x 25x @.50 625 625 hyd cam.
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Old Oct 20, 2009 | 07:12 AM
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I am running the freaking sweetest intake available for L92's IMO though to help it out.
Just wait till I get a set of heads on this beast.

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Old Oct 20, 2009 | 07:23 AM
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That intake is sweet
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Old Oct 20, 2009 | 07:24 AM
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Im putting together a 434 with L92s and that same intake.
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Old Oct 20, 2009 | 07:26 AM
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Originally Posted by dmracing
Im putting together a 434 with L92s and that same intake.
It will fly!
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Old Oct 20, 2009 | 01:30 PM
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Originally Posted by Rock_Daddy
I am running the freaking sweetest intake available for L92's IMO though to help it out.
Just wait till I get a set of heads on this beast.

What intake is that?
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Old Oct 20, 2009 | 01:36 PM
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Cary at Performance Inductions LXR I think it is cast manifold with CNC finish work. It is the **** deluxe.
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Old Oct 20, 2009 | 01:39 PM
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Originally Posted by 1CAMWNDR
Cary at Performance Inductions LXR I think it is cast manifold with CNC finish work. It is the **** deluxe.
Is it a whole lot better than the GMPP EFI single plane intake?
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Old Oct 20, 2009 | 01:40 PM
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yes, way better
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Old Oct 20, 2009 | 01:51 PM
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Originally Posted by ss.slp.ls1
Is it a whole lot better than the GMPP EFI single plane intake?
There is not a graph large enough to measure how much better this intake is than the GMPP or the Edelbrock.



The only reasons I don't have one on my cathedral heads is I can't afford it, and Cary doesn't make one that will fit under my flat hood, i.e. the same height as my Victor Jr.
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Old Oct 20, 2009 | 01:54 PM
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Originally Posted by 1CAMWNDR
There is not a graph large enough to measure how much better this intake is than the GMPP or the Edelbrock.



The only reasons I don't have one on my cathedral heads is I can't afford it, and Cary doesn't make one that will fit under my flat hood, i.e. the same height as my Victor Jr.
I'm assuming the price reflects that as well?
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Old Oct 20, 2009 | 02:01 PM
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i feel like my super victor is just another schlub now, compared to the cary

dam, those cary intakes are works of art
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Old Oct 20, 2009 | 02:38 PM
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Originally Posted by ss.slp.ls1
I'm assuming the price reflects that as well?
I assume you mean the price reflects the flow and power potential. Yes it does. It is meant to be a race piece to bridge the gap between the mass produced intakes from GMPP and Edelbrock and a custom sheet metal intake. Think @$1200(NOPE---SEE POST BELOW) complete with CNC work. Check with Cary for specifics.

Last edited by 1CAMWNDR; Oct 21, 2009 at 09:33 AM.
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