241's or 317's on LQ4? Torque monster?
12-08-2011, 07:59 PM
#1
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241's or 317's on LQ4? Torque monster? Here's what I have:
-241 casting heads, complete and bone stock.
-LS6 yellow valve springs
-XR259 Comp Cams wiggle stick, 206/212, 259/265, .515/.522, 112lsa 110icl
-LS7 lifters
-Truck intake, stock truck throttle body
-1-5/8 shorty headers, true dual 2.5" exhaust with Magnaflow mufflers, x pipe.
-Cone filter and 4" intake piping
Here's what I'm getting:
-Long block LQ4
In the interest of building the most low end torque possible, would you use the stock 241's to achieve the 10:1 compression, or would you mill the 317's? I'd like to work with what I have (or am getting via the purchase of the LQ4) vs selling both sets of heads to jump for 243's or something aftermarket. This engine will have a 5800-6000rpm red line backed with a stout 4L65, turning 37" tires in a 5000lb truck.
Anyone with real experience in their own LQ4 swapping out the stock 317's for 241's?
-241 casting heads, complete and bone stock.
-LS6 yellow valve springs
-XR259 Comp Cams wiggle stick, 206/212, 259/265, .515/.522, 112lsa 110icl
-LS7 lifters
-Truck intake, stock truck throttle body
-1-5/8 shorty headers, true dual 2.5" exhaust with Magnaflow mufflers, x pipe.
-Cone filter and 4" intake piping
Here's what I'm getting:
-Long block LQ4
In the interest of building the most low end torque possible, would you use the stock 241's to achieve the 10:1 compression, or would you mill the 317's? I'd like to work with what I have (or am getting via the purchase of the LQ4) vs selling both sets of heads to jump for 243's or something aftermarket. This engine will have a 5800-6000rpm red line backed with a stout 4L65, turning 37" tires in a 5000lb truck.
Anyone with real experience in their own LQ4 swapping out the stock 317's for 241's?
12-09-2011, 09:59 PM
#3
never cut corners or get cheap when it comes to any thing concerning the motor ,especially the valve train.get some comp 918 springs and some good push rods.a better torque cam is comp 54-455-11.
12-09-2011, 10:59 PM
#4
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I think I would pick the 241's for your application. The added compression is guaranteed torque throughout the powerband and the smaller ports vs. the 317's should yield more low end and mid range torque also.
12-10-2011, 12:57 AM
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I have an LQ9 in both of my trucks, one running ported 241's and a healthy cam, the other running mildly worked an unmilled 317's.
I would still say stick with the superior 317 but get them milled to bump scr at least up to LQ9 level of about 10:1 if not more then get proper pr length. Running that small of a cam you should have no ptv issues.
...and on a sidenote, I will never again recommend 918's. I just had one fail in my 5.3 (therefore did another 6.0 swap on this truck as well), from the new all silver batch too, and on a small tr220 cam. I personally will never run one again, nor recommend them to any friends. Sure it could have been a fluke, but I only spring I've ever had an issue with so I stay away!
I would still say stick with the superior 317 but get them milled to bump scr at least up to LQ9 level of about 10:1 if not more then get proper pr length. Running that small of a cam you should have no ptv issues.
...and on a sidenote, I will never again recommend 918's. I just had one fail in my 5.3 (therefore did another 6.0 swap on this truck as well), from the new all silver batch too, and on a small tr220 cam. I personally will never run one again, nor recommend them to any friends. Sure it could have been a fluke, but I only spring I've ever had an issue with so I stay away!
12-10-2011, 08:47 AM
#6
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...and on a sidenote, I will never again recommend 918's. I just had one fail in my 5.3 (therefore did another 6.0 swap on this truck as well), from the new all silver batch too, and on a small tr220 cam. I personally will never run one again, nor recommend them to any friends. Sure it could have been a fluke, but I only spring I've ever had an issue with so I stay away!
12-10-2011, 08:53 AM
#7
TECH Resident
FYI...the early 241's (806, 853) had larger combustion chambers (69cc)...'97-'98 #12559806.
'99-'03 were 66.7cc
'99-'03 were 66.7cc
Last edited by Paul57; 12-10-2011 at 08:45 PM.
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12-10-2011, 12:59 PM
#9
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Maybe when they came out with the smaller chamber that is when they used the 241. 241, 806, 853...all the same from my data...that must mean valve and port size.
12-10-2011, 01:09 PM
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Paul57, yes I had the 918 spring break recently. I made a thread about it on performancetrucks section if you wanted to read about it... don't want to sidetrack this thread.
12-10-2011, 01:41 PM
#11
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Any chance you can share the link?? I am concerned because I just got a set of 918's for my heads.
Last edited by Paul57; 12-10-2011 at 04:11 PM.
12-10-2011, 01:52 PM
#12
806 heads were sand cast instead of SPM castings, and had peremiter bolt valve covers.
241's came on 2001+ cars. SPM castings (I have seen 241's on 99 cars as well.)
853's 99 and 2000 cars.
only real difference is the casting method and valve cover style.
12-10-2011, 04:10 PM
#14
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nope, they all had the same valve size and chamber.
806 heads were sand cast instead of SPM castings, and had peremiter bolt valve covers.
241's came on 2001+ cars. SPM castings (I have seen 241's on 99 cars as well.)
853's 99 and 2000 cars.
only real difference is the casting method and valve cover style.
806 heads were sand cast instead of SPM castings, and had peremiter bolt valve covers.
241's came on 2001+ cars. SPM castings (I have seen 241's on 99 cars as well.)
853's 99 and 2000 cars.
only real difference is the casting method and valve cover style.
http://www.theturboforums.com/smf/ls...swap-info-etc/
12-10-2011, 08:44 PM
#16
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I understand that 241's are the same. I think someone was trying to say that 806 and 853 are the same as 241...except for combustion chamber size...and...maybe the valve cover style and where they were cast or something. Kind of like the 243 and 799.
