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L92 Heads/Intake - Cam Question

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Old Aug 22, 2006 | 01:05 PM
  #21  
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Originally Posted by carado1984
can someone please clarify the head numbers for me.. so the 853 and 241 are both ls1 heads? I know the 243s are ls6 heads whats the difference between the first two and between those 3, the l92 and the 5.3 heads, which have the most potential?
the L-92's have the most potential by far, but only if you have a 4" bore or larger. The 243's are considered by most to be the best for a stock size bore. Many people have made big power with the 5.3's also. Hope this helps
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Old Aug 22, 2006 | 03:45 PM
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L92's have 2.16 intake valves which will have PTV issues unless the pistons have valve reliefs cut in them.
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Old Aug 25, 2006 | 01:40 PM
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Originally Posted by HEMIETR
L92's have 2.16 intake valves which will have PTV issues unless the pistons have valve reliefs cut in them.
what if you run them on a 408 with -13cc reliefs and a cam similar to the Trex but with a 112+2 lsa? how well will these do with this cam and motor
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Old Aug 25, 2006 | 02:28 PM
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Originally Posted by Quik
what if you run them on a 408 with -13cc reliefs and a cam similar to the Trex but with a 112+2 lsa? how well will these do with this cam and motor
I would get some port work done. The exhaust flow on the L92's are not that great. I think your combo would work.
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Old Aug 29, 2006 | 11:46 AM
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Originally Posted by HEMIETR
L92's have 2.16 intake valves which will have PTV issues unless the pistons have valve reliefs cut in them.
Does the LS2 come with compatible pistons?
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Old Aug 29, 2006 | 12:08 PM
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Im going to use a 224 236 668 640 LSA 117 cam with my l92 heads
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Old Aug 29, 2006 | 12:09 PM
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Originally Posted by Quik
what if you run them on a 408 with -13cc reliefs and a cam similar to the Trex but with a 112+2 lsa? how well will these do with this cam and motor
what ur book doesnt tell u what u should do?
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Old Aug 29, 2006 | 12:17 PM
  #28  
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Originally Posted by Quik
what if you run them on a 408 with -13cc reliefs and a cam similar to the Trex but with a 112+2 lsa? how well will these do with this cam and motor
gee there son,what was i going to use!
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Old Aug 29, 2006 | 01:40 PM
  #29  
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There is an interesting article in the last popularhotrodding mag I think its onsite for reading too, on head design. Basically with high compression engines exhaust valve size is less important as cylinder pressure drops fast with high compression so most exhaust work is done sooner. Therefore you can open the valve sooner in the power stroke without robbing too much power. Also I guess part of the reason why cam timing is the way that it is with the ls7 series. I think its designed that way as the intake valve is normally the one that needs crutching not the exhaust!
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Old Aug 29, 2006 | 02:30 PM
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Originally Posted by Supernoma
Does the LS2 come with compatible pistons?
Stock LS2 pistons don't have valve reliefs.
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Old Aug 29, 2006 | 02:32 PM
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Originally Posted by ringram
There is an interesting article in the last popularhotrodding mag I think its onsite for reading too, on head design. Basically with high compression engines exhaust valve size is less important as cylinder pressure drops fast with high compression so most exhaust work is done sooner. Therefore you can open the valve sooner in the power stroke without robbing too much power. Also I guess part of the reason why cam timing is the way that it is with the ls7 series. I think its designed that way as the intake valve is normally the one that needs crutching not the exhaust!
Thats true. I have a set of L92 heads and not sure what to do to them to make them work on a stock LS2. My cam is 228/232 .612/.600 111.
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Old Aug 29, 2006 | 07:45 PM
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I think your cams going to leave a lot on the table with a L92 head, even on the 4" bore the heads will want some split. Nothing crazy like a stock LS7 head but a lot more than we are used to with the LS1/LS2 stuff.

Bret
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Old Aug 29, 2006 | 09:54 PM
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Originally Posted by ringram
I think its designed that way as the intake valve is normally the one that needs crutching not the exhaust!
Of course this comment is mostly directed to the LSx series. The previous generations were the exact opposite.

Ben T.
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Old Aug 30, 2006 | 06:47 AM
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so with these heads on a 06 TBSS ,what cam & intake should i use?(its 2wd)
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Old Aug 30, 2006 | 08:52 AM
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Originally Posted by PewterSSZ
so with these heads on a 06 TBSS ,what cam & intake should i use?(its 2wd)
224 236 668 640 lsa 117
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Old Aug 30, 2006 | 09:05 AM
  #36  
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Uh, no that's going to be off.

TBSS? I'm getting lost in the nomenclature but that's a SS Silverado 6.0l? I'd use the L92 intake along with the heads and a much smaller cam than was suggested.

Bret
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Old Aug 30, 2006 | 09:29 AM
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TBSS= Trailblazer SS LS2
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Old Aug 30, 2006 | 10:06 AM
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Originally Posted by tmoneyr007
TBSS= Trailblazer SS LS2
which is also same as the LQ9 but in aluminum version
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Old Aug 30, 2006 | 10:07 AM
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Originally Posted by SStrokerAce
Uh, no that's going to be off.

TBSS? I'm getting lost in the nomenclature but that's a SS Silverado 6.0l? I'd use the L92 intake along with the heads and a much smaller cam than was suggested.

Bret
dotn you like that cam that streetnstrip listed?
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Old Aug 30, 2006 | 10:48 AM
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These things aren't going to need intake duration, and until you get flow numbers on a 4.0" bore your not going to know the split. Even then they will still want more exhaust duration than that. These heads are made like any good NA race head, HUGE intake valves, as big as you can get in there and small exhaust valves. We are talking a diameter/circumfrence ratio of 73% compared to 77% in standard LS or SBC heads. When we get flow numbers on the smaller bore and with intakes and exhaust pipes then it should give us a better indication of how much split, but even so it's still going to be more than 10 degs difference at .050", so the traditional LS cams will not give the best results.

Bret
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