LQ4 Questions
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Joined: Mar 2009
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LQ4 Questions Well, I am new here, so hello everyone.
I may be picking up a 61k LQ4 soon. 2001, so it has the aluminum heads, 317's if I did my research correctly. I am assuming it would be a good idea to get new bearings, rings and bolts naturally. But I wanted to know if milling the heads to up the compression would be a good idea? And if so, what is recommended. Any interference problems?
I would like to make a respectable amount of HP, but still maintain daily driveability, so I am open for recommended cam choices. I am somewhat on a budget, so I would like to use these heads.
Thanks in advance.
I may be picking up a 61k LQ4 soon. 2001, so it has the aluminum heads, 317's if I did my research correctly. I am assuming it would be a good idea to get new bearings, rings and bolts naturally. But I wanted to know if milling the heads to up the compression would be a good idea? And if so, what is recommended. Any interference problems?
I would like to make a respectable amount of HP, but still maintain daily driveability, so I am open for recommended cam choices. I am somewhat on a budget, so I would like to use these heads.
Thanks in advance.
Well, I am new here, so hello everyone.
I may be picking up a 61k LQ4 soon. 2001, so it has the aluminum heads, 317's if I did my research correctly. I am assuming it would be a good idea to get new bearings, rings and bolts naturally. But I wanted to know if milling the heads to up the compression would be a good idea? And if so, what is recommended. Any interference problems?
I would like to make a respectable amount of HP, but still maintain daily driveability, so I am open for recommended cam choices. I am somewhat on a budget, so I would like to use these heads.
Thanks in advance.
I may be picking up a 61k LQ4 soon. 2001, so it has the aluminum heads, 317's if I did my research correctly. I am assuming it would be a good idea to get new bearings, rings and bolts naturally. But I wanted to know if milling the heads to up the compression would be a good idea? And if so, what is recommended. Any interference problems?
I would like to make a respectable amount of HP, but still maintain daily driveability, so I am open for recommended cam choices. I am somewhat on a budget, so I would like to use these heads.
Thanks in advance.
I doubt you will get much reponse over here concerning the LQ4.
thats not true. every question i had regarding lq4's were answered quickly. anyways, milling the heads would be a great idea, as the factory CR is only 9.5:1. i think with the 00-01 motors you need to run a 4L80E trans, not sure of the reason but someone else will be able to chime in on that. I have an 05 LQ4 motor for sale if you are interested
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The more I read, the more I think some 243's would be the way to go with the heads. Probably gonna keep the truck intake, at least for a little while. Just need to decide on a cam. Gonna be a daily, so something reasonable. Any suggestions?
Last edited by nineeights10ss; Mar 2, 2009 at 03:22 PM. Reason: ..
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i believe the 01 lq4 does not have the spacer on the end of the crank, meaning it would bolt up like any other ls engine to whatever it is you want to run.
those engines have a -6.5 to -6.7 cc DISH in the factory pistons. when coupled with 72cc heads you get a CR somewhere in the neighborhood of 9.4-9.5.
99-00 aren't problem engines, they just require a little more attention when bolting a transmission up. performancewise there is no difference.
those engines have a -6.5 to -6.7 cc DISH in the factory pistons. when coupled with 72cc heads you get a CR somewhere in the neighborhood of 9.4-9.5.
99-00 aren't problem engines, they just require a little more attention when bolting a transmission up. performancewise there is no difference.
The more I read, the more I think some 243's would be the way to go with the heads. Probably gonna keep the truck intake, at least for a little while. Just need to decide on a cam. Gonna be a daily, so something reasonable. Any suggestions?
Nice engine dre2013. I might be picking mine up for $450 though, and only 2 miles away, so you gotta hard bargain to beat :-)
Nice engine dre2013. I might be picking mine up for $450 though, and only 2 miles away, so you gotta hard bargain to beat :-)
The Liq is a great engine. The 317 heads are not the problem. Change the oil pump, a new cam,a set of lifters, a 85mm TB, new injectors, a good tune and a god exhaust should push that engine near HP. with the truck intake.
that should do in that truck. Change to 243 want give you much. Check out Ebay, and see if you can get a used charger for that 317 heads. it Will push that engine over the 500 mark.
that should do in that truck. Change to 243 want give you much. Check out Ebay, and see if you can get a used charger for that 317 heads. it Will push that engine over the 500 mark.
the compression sucks on these engines suck. the 243s or milling the 317s will help the midrange. next week im putting some milled l92s on and cant wait to see what its going to be like with the higher compression.
243 and 317 are the same type head, 317 has larger chamber at 71cc,
243 at 65cc
mill the heads .030 for just under 10:1 scr
a ls6 z06 cam from 02-04 will put your engine around the 400-420bhp range.
with milled heads, ls6 intake and even with stock manifolds. use ls6 rod bolts with the rods, to keep the price low. speed pro makes excellent replacement pistons and rings which cost around 400$ or less with rings. up to .060 over bore
243 at 65cc
mill the heads .030 for just under 10:1 scr
a ls6 z06 cam from 02-04 will put your engine around the 400-420bhp range.
with milled heads, ls6 intake and even with stock manifolds. use ls6 rod bolts with the rods, to keep the price low. speed pro makes excellent replacement pistons and rings which cost around 400$ or less with rings. up to .060 over bore
pr will have to be determined since u want to go with .080 wall pushrods anyway. the pushrods are around 100$ in just about any length u need
or if u can find a set from a 02-04 ls6 z06, but since i mill my heads, and block
pr are the last thing i order for the engine. besides the stock pr are flimsy compared to the aftermarket and the price range is the same.