Rebuild 6.0L help
02-08-2009, 05:53 AM
#101
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This is one thing I was curious about, since I don't think we ever discussed this during the planning and rebuild. What did you do for push rods? By the way, if it's just a ticking...that's typical of high(er) lift cams especially when you are nearing the recommended limits of the springs.
It is a fair amount of ticking. Doesn't happen at idle (or hard to hear). Also, after a couple WOT passes yesterday, it almost went away. After it cooled, the ticking came back.
Also got a check engine light which I assume is the multiple misfire again. I don't think it is a real misfire. Can't feel it at all. O2s are fine, changed plugs, checked intake connections. Haven't changes wires yet, but we'll swap a few things around to see if it follows various item. I'm also going to get this heavy oil (with assembly lube) out of it today.
Even with the few pesky issues, it is running great!
Last edited by clemsondave; 02-08-2009 at 06:23 AM.
02-12-2009, 06:52 PM
#104
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Misfire was false. It was just b/c of the different cam. Tuner fixed the threshold.
Not every day you stump one of the top mechanics and top machinist. I had both of them over tonight to help me figure out the valvetrain issues. Neither had seen this problem before.
I have valvetrain noise. Worse than that, the lifters are bleeding down in a matter of 10 seconds are so. We measured for correct pushrods, put them in and no difference. We put in two other lengths to vary the pre-load from .030 - .080 and the lifters still bleed down. Plenty of oil pressure (apx 60#).
They are going to call Comp tomorrow to see what they think. We have it narrowed down to a few things.
1. bad lifters (brand new LS7s); it's just strange that all of them (on the one side we are testing) are bad
2. incorrect match-up between the cam, LS7 lifters and LS6 springs
Not every day you stump one of the top mechanics and top machinist. I had both of them over tonight to help me figure out the valvetrain issues. Neither had seen this problem before.
I have valvetrain noise. Worse than that, the lifters are bleeding down in a matter of 10 seconds are so. We measured for correct pushrods, put them in and no difference. We put in two other lengths to vary the pre-load from .030 - .080 and the lifters still bleed down. Plenty of oil pressure (apx 60#).
They are going to call Comp tomorrow to see what they think. We have it narrowed down to a few things.
1. bad lifters (brand new LS7s); it's just strange that all of them (on the one side we are testing) are bad
2. incorrect match-up between the cam, LS7 lifters and LS6 springs
02-12-2009, 07:44 PM
#105
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all the lifters only one one side sounds like it could be a difference in head surface machining
if one head was stock plane and the other was -.030 you'd ideally want 8 .030 shorter pushrods on that side
other thought, could an oil gallery be blocked or not blocked properly? I'm jstu shooting into the wind here to try and spark up some ideas
did you silicone any gaskets?
if one head was stock plane and the other was -.030 you'd ideally want 8 .030 shorter pushrods on that side
other thought, could an oil gallery be blocked or not blocked properly? I'm jstu shooting into the wind here to try and spark up some ideas
did you silicone any gaskets?
02-12-2009, 08:15 PM
#106
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all the lifters only one one side sounds like it could be a difference in head surface machining
if one head was stock plane and the other was -.030 you'd ideally want 8 .030 shorter pushrods on that side
other thought, could an oil gallery be blocked or not blocked properly? I'm jstu shooting into the wind here to try and spark up some ideas
did you silicone any gaskets?
if one head was stock plane and the other was -.030 you'd ideally want 8 .030 shorter pushrods on that side
other thought, could an oil gallery be blocked or not blocked properly? I'm jstu shooting into the wind here to try and spark up some ideas
did you silicone any gaskets?
I did not silicone any gaskets. I replaced all of them, but no silicone.
If the oil galley was blocked, would the oil come up the pushrod? We've got good oil up the rods.
thanks for the thoughts!
I assume LS6 springs/LS7 lifters are a fairly common practice, right?
02-12-2009, 08:33 PM
#108
We have not tested the other side, so not sure if it is a one side versus the other side problem. Heads were not milled down.
I did not silicone any gaskets. I replaced all of them, but no silicone.
If the oil galley was blocked, would the oil come up the pushrod? We've got good oil up the rods.
thanks for the thoughts!
I assume LS6 springs/LS7 lifters are a fairly common practice, right?
I did not silicone any gaskets. I replaced all of them, but no silicone.
If the oil galley was blocked, would the oil come up the pushrod? We've got good oil up the rods.
thanks for the thoughts!
I assume LS6 springs/LS7 lifters are a fairly common practice, right?
02-12-2009, 08:39 PM
#109
He Found the LQ9/LS2 OEM style piston. Sealed Power H1129CT and comes with the pins. They come in stock 4.0, +.50mm and +.75mm. Same part number for an '03 Escalade (vin N), C6 Vette and 1500 SS (vin N).
LS2 connecting rods from Ebay