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What Do You Think..2007+ 5.3 With L92 6.2 Heads

faisal

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faisal Enthusiast

faisal

Posted
Posted

a friend of main owns a NBS RCSB with a 5.3 and he wants more power

 

we talked about the headers,cai,programming and all but he said he want his truck to look normal and performce better

 

i told him about the 6.2 heads high flow numbers but didnt actually knew about the chamber size...

 

so i said if the 5.3 have the 9.6-9.9:1 and the 6.2 have 10.5...so we wont lose CR...and if we did we would smalling the champer by 1mm or 1,1\2mm

 

and if i did all of this do i need to reprogram my computer,would i face any trouble with vlavterain,lifters and all

 

another prob is with the cam...i was searching for the 6.2 cam numbers and didnt faind any..so we could throw it with new heads

 

any advice..

faisal Enthusiast

faisal

Posted
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no one here.....i searched in ls1fourm and they said that even a 5.7 wont handle the 6.2 heads...case the valves are to big that they would hit the cylinder so i need at least to bore the engine to 4.000 inches

 

thanx for nothing:lol:

L29er Senior Enthusiast

L29er

Posted
Posted

PM Ryan00TJ i seen him talking about this in another thread, he may be of help... or at least he may have sympathy... :(

08_Denali_22 Enthusiast

08_Denali_22

Posted
Posted

I almost positve the L92 heads won't fit. They need a larger bore size than the 5.3ltr has to offer. IIRC they require a minimum of a 4" bore. Not only that but the heads that are on that truck performa fine the way they are. For the cost of swapping out the heads or having work done really isn't worth the gains you'll get. If he is planning on going forced induction in the future maybe it will warrent going with some head work. Go with a cam for the combo that he already has and it will make a world of difference. On top of the cam have him throw in a stall, somewhere around 3000 rpms or so, and it will be a whole new truck.

faisal Enthusiast

faisal

Posted
  • Author
Posted
I almost positve the L92 heads won't fit. They need a larger bore size than the 5.3ltr has to offer. IIRC they require a minimum of a 4" bore. Not only that but the heads that are on that truck performa fine the way they are. For the cost of swapping out the heads or having work done really isn't worth the gains you'll get. If he is planning on going forced induction in the future maybe it will warrent going with some head work. Go with a cam for the combo that he already has and it will make a world of difference. On top of the cam have him throw in a stall, somewhere around 3000 rpms or so, and it will be a whole new truck.

 

 

he was thinking 2500 stall,but we didnt seem to find any cam kit thats desgined speicaly for the 5.3 or even a cam for truck use

 

 

i wrote to comp cams about thair truck cams if they would fit into the new 5.3s cause idont have an idea if the cam sensor position was changed or any thing else that would make a prob....espicaly with th AFM..

08_Denali_22 Enthusiast

08_Denali_22

Posted
Posted

You have to do some converting to get the cams from the gen 3 trucks/cars to work. I would do something like a 212 218 cam in a truck with that stall. Do some reading over at pt.net; especially in the GMT 900 section. IIRC there is a thread dedicated to what is needed to swap in a gen 3 cam into our gen 4 trucks.

 

*Edit* Here is a good thread to start with for your research. http://www.performancetrucks.net/forums/sh...ad.php?t=421179

faisal Enthusiast

faisal

Posted
  • Author
Posted
You have to do some converting to get the cams from the gen 3 trucks/cars to work. I would do something like a 212 218 cam in a truck with that stall. Do some reading over at pt.net; especially in the GMT 900 section. IIRC there is a thread dedicated to what is needed to swap in a gen 3 cam into our gen 4 trucks.

 

*Edit* Here is a good thread to start with for your research. http://www.performancetrucks.net/forums/sh...ad.php?t=421179

 

 

thanx alot :D

Ryan00TJ Enthusiast

Ryan00TJ

Posted
Posted

L92 heads require a 4.000" bore vs the 5.3's 3.780" bore. Your buddy's NBS 5.3L will have #243's or #799 castings which are the same heads on the 2001-04 LS6 Z06, 05+ LS2's. They flow really well stock. All they really need to make decent power is a larger cam and supporting mods, ie intake, headers, catback, etc... If you really want to get serious then opt for an aftermarket set of heads.... AFR 205's, Trickflow 215's.

 

Don't forget to address the stock stall converter.

08_Denali_22 Enthusiast

08_Denali_22

Posted
Posted
You have to do some converting to get the cams from the gen 3 trucks/cars to work. I would do something like a 212 218 cam in a truck with that stall. Do some reading over at pt.net; especially in the GMT 900 section. IIRC there is a thread dedicated to what is needed to swap in a gen 3 cam into our gen 4 trucks.

 

*Edit* Here is a good thread to start with for your research. http://www.performancetrucks.net/forums/sh...ad.php?t=421179

 

 

thanx alot :confused:

 

 

 

No problem. I'm glad I was able to help.

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