Cam or No Cam For Rock Crawling
08-18-2010, 10:07 AM
#1
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Cam or No Cam For Rock Crawling Wow guys, there is so much information on here that its making my head explode. Maybe someone can just shoot me a straight answer.
I have an LQ4 6.0 with L92 heads, truck intake. Should I or should I not upgrade the stock cam? It is in my Rock Crawler so I usually need low end torque and hp. Sometimes I need to be able to spin 42" tires with a quickness.
If I should change the cam - any recommendations?
I have an LQ4 6.0 with L92 heads, truck intake. Should I or should I not upgrade the stock cam? It is in my Rock Crawler so I usually need low end torque and hp. Sometimes I need to be able to spin 42" tires with a quickness.
If I should change the cam - any recommendations?
08-18-2010, 10:23 AM
#3
If you need lots of low end power and torque I am not sure that the L92 heads will be the best choice for you. The L92 heads have a huge intake runner and intake valve, this will make huge numbers in the top end of the powerband but it will cause low end power to suffer. Especially on an LQ4 motor because those motors have a dished piston, with a stock chamber you will be at 9.6 to 1. Combined with the large runners and valves low end power is going to be hard to come by. I would recommend trying to switch to some different heads, maybe an LS6 or 5.3l head. Both of these heads will feature a much smaller chamber to start with which will bring up compression and give you more low end power and torque, not to mention the motor will be more responsive. IMO, compression is worth more then flow especially for what you are trying to do.
For cam I would recommend a 220R (220/220 .581.581). This cam will provide a lot of low end and midrange power. If you can change heads and throw that cam in there, low end power should not be much of a worry.
For cam I would recommend a 220R (220/220 .581.581). This cam will provide a lot of low end and midrange power. If you can change heads and throw that cam in there, low end power should not be much of a worry.
08-18-2010, 10:31 AM
#4
Comp had at one point was making Truck Specific cam which in turn had taken into consideration the "Race Weight" of the heavier LS based trucks. Meaning a MS4 cam may not be the best choice when your trying to tow a camper.
I have also seen rock crawlers took towards a roots blower set up and gear it to their particular needs, and in most times they were under driving it.
I have also seen rock crawlers took towards a roots blower set up and gear it to their particular needs, and in most times they were under driving it.
08-18-2010, 11:10 AM
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I am finding 706 and 862 casting numbers for the 5.3l heads. Which one would I need and would they need upgrading with valves and springs? What specs?
Sorry for all the questions. I just want to get it right.
Sorry for all the questions. I just want to get it right.
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08-18-2010, 11:13 AM
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08-18-2010, 11:16 AM
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08-18-2010, 11:23 AM
#11
Those heads from Ebay would probably work alright. I wouldn't expect them to light the world on fire as far as power goes but with them being milled like that you will have good compression in the motor. The cam I suggested earlier should have no problems fitting with those heads because it is a pretty small cam for these motors.
As far as casting numbers go the 5.3l is 862 and 706. The LS6 heads will be a 243 and 799.
As far as casting numbers go the 5.3l is 862 and 706. The LS6 heads will be a 243 and 799.
08-18-2010, 11:56 AM
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Those heads from Ebay would probably work alright. I wouldn't expect them to light the world on fire as far as power goes but with them being milled like that you will have good compression in the motor. The cam I suggested earlier should have no problems fitting with those heads because it is a pretty small cam for these motors.
As far as casting numbers go the 5.3l is 862 and 706. The LS6 heads will be a 243 and 799.
As far as casting numbers go the 5.3l is 862 and 706. The LS6 heads will be a 243 and 799.
08-18-2010, 01:42 PM
#15
We don't have a preference as far as casting goes for either head. The LS6s would be fine out of the box, but the 5.3l heads really need a larger valve to perform up to snuff. The stock valve would limit performance a little because it is smaller then a stock LS valve.
The stock 6.0 heads wouldn't really get you anywhere because they also have a large 72cc combustion chamber. I think you compression ratio with those would put you down around 9.5:1.
The stock 6.0 heads wouldn't really get you anywhere because they also have a large 72cc combustion chamber. I think you compression ratio with those would put you down around 9.5:1.
08-26-2010, 12:55 PM
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Looks like most sets of heads do not come with rockers. Can I use the ones off of my old heads or do I have to buy a new set? Also, will I need a new set of push rods or can I use my old ones?
