how to tell what year 6.0l? what years to stay away from?
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how to tell what year 6.0l? what years to stay away from?
I'm going to go look at a 6.0l that the guy has no info on. Ive found out how to tell if it is an lq4 or lq9 but not what year it is. also what are the years to stay away from? i know some years have a different length crank. more info please.
thanks,
Dan.
thanks,
Dan.
#5
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I had a 2001 motor thad had bad piston slap. I did some research on it. It is caused because a cylinder has a certain tolerance and the piston has a tolerace if they were all good they would throw what ever piston in what ever hole, if a small piston went in a big hole it would cause the noise. In 2003 they changed the tolerances and matched pistons to cylinders. I would do a 03 or newer if you wanted to be sure and get a quite motor.
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Going from memory here, but the '00-'01 engines were the ones with the (shorter|longer - can't remember which right now) crankshafts, so if you get one that's newer than that, you should have the "normal" length crank.
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so far from what ive read dont hold me to it is the heads are the same the only real difference is the pistons lq4 dished lq9 flat top. if its together some one (forgot who) had a great idea of running something across the tops of the piston through the spark plug hoel if you feel a ridge its a lq4
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so far from what ive read dont hold me to it is the heads are the same the only real difference is the pistons lq4 dished lq9 flat top. if its together some one (forgot who) had a great idea of running something across the tops of the piston through the spark plug hoel if you feel a ridge its a lq4
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the 99 and 00 blocks have a longer crank this will not allow a 4L60 or 700 or ls t56. a 4L80 or 400 will fit but otherwise theres no way around it short of changing out the crank, the newer ones 01s used a bolt on spacer that goes in between the flexplate and the crank. heres a link to my thread on turdgen for pics n more info. http://www.thirdgen.org/techboard/lt...0-lq4-6-a.html
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#13
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It's only a depth thing. Some cranks are .400" shorter than others and need a $37 adapter from GMPP to use an older style (pre98) trans. The "normal" Gen III spacing is the .400" shorter design while I have read somewhere that all 4L80E equipped engines had the longer crank and are essentially using the old style spacing for the torque converter. I can't find my notes on that and never had a 4L80E trans or way to verify it is only 4L80 equipped engines. The long crank engines are easy to spot though, on "normal" Gen III engines the crank flange is flush with the seal while the "long" ones stick out. If you do get the short crank engine, don't forget new longer flexplate bolts when you buy the adapter.
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so if I'm going to be using a th400 i actually don't have to worry about it? and I'm a litttle confused by gofast it seems that it doesn't really matter one way or another all you have to do is buy an adapter?? so there are only trans that the crank affects?
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The 99-00 6.0L`s have the longer crank that fits with th350`s, 400`s, 700r4`s, 4l80e`s, and pre 98 4l60e`s They also have steel heads.
317 heads are basically LS6 heads with larger chambers. They were used on both LQ4`s and LQ9`s. The difference between an LQ4 an 9 is just in the pistons.
317 heads are basically LS6 heads with larger chambers. They were used on both LQ4`s and LQ9`s. The difference between an LQ4 an 9 is just in the pistons.
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Hope this and what G-Body said clears things up.
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As mentioned, the 99-00s got the longer crank. They also received iron heads. The 2001+ models got the aluminum 317 heads. Both LQ4 and LQ9 got the same heads, the difference in the LQ9 was the pistons, wristpins and connecting rods, as well as the cam. The LQ9 had flat top pistons with floating wrist pins.