Need advice choosing heads for a cammed 6.0L
10-15-2009, 02:12 PM
#12
10-15-2009, 08:33 PM
#13
A 6.0L lq4 with 70cc heads on it will only be 9.6:1 compression. This is complete weak sauce. Any performance 6.0L I wouldn't run unless it had a minimum of 10.25:1 compression. With the aluminum heads this is like having only a 9.25:1 compression iron headed engine. Heat=energy. Energy=horsepower. This is why I always wanted to toy with a set of the old iron heads that came on the early 6.0L's. They're cheap, strong, heavy (worst part) and should yield a good amount of power on the cheap.
Back to the L92 setup. Go for it if you're going to get at least 10.25:1 or better. For those who want to argue, I can post graphs of another members stock LQ4 TR224 cammed truck vs my 10.6:1 compression LQ4 with a smaller cam. I'll show you the difference in low-mid range power and even more up top.
Back to the L92 setup. Go for it if you're going to get at least 10.25:1 or better. For those who want to argue, I can post graphs of another members stock LQ4 TR224 cammed truck vs my 10.6:1 compression LQ4 with a smaller cam. I'll show you the difference in low-mid range power and even more up top.
10-20-2009, 06:20 PM
#15
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Thanks for the input yall I appreciate it. Someone asked what dyno the truck was run on. The truck was tuned by G-force motorsports in Pearland, TX and they have a Dynojet 248x. I know the numbers seem low but I'm guessing the 4L80E + 9.5in 14 bolt + 285's + 3.73 gears were a contributing factor. I have not had a chance to take the truck to the track since I changed the cam but before the swap I ran 15.5 @ 92 mph with a 5500lb race weight. I am going to try and go back soon to get some runs with the new cam before I bolt on a different set of heads. What are yall's thoughts on track times with the cam on stock heads vs. the TSP LS6 2.5 heads? I really just want to get this truck in the 14's if possible. Also, I'm thinking that a set of 4.10 gears would really help get me moving off the line since my truck has 285's and I have to overcome the extra weight of the 2500. As far as my choice on heads, I see the advantage of the TSP LS6 heads because they are a direct bolt on and I don't have to modify my intake or accessory brackets to deal with the clearance issues of the L92's.
10-20-2009, 06:28 PM
#17
dunno if i would run l92s on a lq4, my opinion the l92 heads were made for high compression motors, the decks are thinner than most ls motors if not all of them, i milled mine .015 just to get 11:1 cr with a .040 gasket, but i am NA and using a lq9 stock short block. also i had a cam spected out just for my setup which i would reccomend anyone to get if they run these heads.. anyway wont go into detail just the way i think.
10-20-2009, 06:31 PM
#18
Thanks for the input yall I appreciate it. Someone asked what dyno the truck was run on. The truck was tuned by G-force motorsports in Pearland, TX and they have a Dynojet 248x. I know the numbers seem low but I'm guessing the 4L80E + 9.5in 14 bolt + 285's + 3.73 gears were a contributing factor. I have not had a chance to take the truck to the track since I changed the cam but before the swap I ran 15.5 @ 92 mph with a 5500lb race weight. I am going to try and go back soon to get some runs with the new cam before I bolt on a different set of heads. What are yall's thoughts on track times with the cam on stock heads vs. the TSP LS6 2.5 heads? I really just want to get this truck in the 14's if possible. Also, I'm thinking that a set of 4.10 gears would really help get me moving off the line since my truck has 285's and I have to overcome the extra weight of the 2500. As far as my choice on heads, I see the advantage of the TSP LS6 heads because they are a direct bolt on and I don't have to modify my intake or accessory brackets to deal with the clearance issues of the L92's.
10-20-2009, 07:05 PM
#19
you can run a 90mm cable TB with no issues.
I noticed that you have LTs . . . but you have a Flowmaster . . . Get a cutout for the track.
Shorter tires will drop times for sure !
If you don't want to run a different intake, I would ***** up tech for a set of used ported 5.3 heads . . . Either PRC or TSP
I've got close to the same setup that you have, but I'm an 04 and 4wd. I'm planning on running the L92s, L92 truck intake, and a cam in the 230s with a big split.
