[Z06] My Z made it without dropping a valve, fix in works
02-25-2013, 01:27 PM
#1
Race Director
Thread Starter
My Z made it without dropping a valve, fix in works
March 23 Edit: Top of page 5 is the arrival of the reworked heads. Assembly will follow.
I am very excited right now. While it looks to be a bit of work tearing the heads off, I have done this on many other engines. It is just a matter of time now.
10K miles on my Z06, 2007 model. #4 spark plug came out dripping wet with oil. Just above idle "knock" like noise that is worrisome.
My heads are going to go to Reher Morrison in Arlington, TX for Darin Morgan to massage into shape. Looks like a mild bump in compression (clean up mill), PP for mid range torque with the idea of bumping up to a mild cam late this year, bronze guides, new solid SS exhaust valves, and all Ti stem hardware. The stock intakes will be reused after cleaning up and some prep work.
I am going to have them measure the stock guides in place to give some additional information to the "oil on plugs" theory that floats around in here. Some believe it to be a real danger sign, others believe it is just a seal or even a valve cover seal(not such leakage on my Z). Best case is that it is just a valve seal on my Z06, but with the additional finds I made, I believe the exhaust guides on my right head are shot for sure and the left head is certainly up for debate. I will know for sure in 2-3 weeks.
Just idled the Z into location in the garage and she is cooling down. Gonna put her up on stands to help with my back during this, I am 6'5", and provide quick access to whatever I made need under the car during the work.
After my discussion with Darin Morgan, I have also decided to run the Yella Terra RRs I already have. I will be using the UMI spacer on the valve covers, though, and not the YT spacer gasket.
This should be fun. The adventure begins.
I am very excited right now. While it looks to be a bit of work tearing the heads off, I have done this on many other engines. It is just a matter of time now.
10K miles on my Z06, 2007 model. #4 spark plug came out dripping wet with oil. Just above idle "knock" like noise that is worrisome.
My heads are going to go to Reher Morrison in Arlington, TX for Darin Morgan to massage into shape. Looks like a mild bump in compression (clean up mill), PP for mid range torque with the idea of bumping up to a mild cam late this year, bronze guides, new solid SS exhaust valves, and all Ti stem hardware. The stock intakes will be reused after cleaning up and some prep work.
I am going to have them measure the stock guides in place to give some additional information to the "oil on plugs" theory that floats around in here. Some believe it to be a real danger sign, others believe it is just a seal or even a valve cover seal(not such leakage on my Z). Best case is that it is just a valve seal on my Z06, but with the additional finds I made, I believe the exhaust guides on my right head are shot for sure and the left head is certainly up for debate. I will know for sure in 2-3 weeks.
Just idled the Z into location in the garage and she is cooling down. Gonna put her up on stands to help with my back during this, I am 6'5", and provide quick access to whatever I made need under the car during the work.
After my discussion with Darin Morgan, I have also decided to run the Yella Terra RRs I already have. I will be using the UMI spacer on the valve covers, though, and not the YT spacer gasket.
This should be fun. The adventure begins.
Last edited by WhiteDiamond; 03-23-2013 at 11:37 PM.
02-25-2013, 01:45 PM
#2
Safety Car
Heads
Hey
Are you going to post updated on your progress with a pic or 2 along the way. It would be interesting to watch along while your at it. I also have a 2007 Z, 4000 miles and I'm already worried. Mine was built in 9/06 what is your production date?
Good luck with the head swap, I'm not too far behind you.
Are you going to post updated on your progress with a pic or 2 along the way. It would be interesting to watch along while your at it. I also have a 2007 Z, 4000 miles and I'm already worried. Mine was built in 9/06 what is your production date?
Good luck with the head swap, I'm not too far behind you.
02-25-2013, 01:49 PM
#3
I would be very interested if you could relay a synopsis of his thoughts on that issue (RR vs OEM rocker).
02-25-2013, 02:14 PM
#5
Safety Car
I installed the Comp trunnion kit this weekend, didn't think I would like it. It really quieted down the valve train. I also noticed a lot of slop in the stock trunnions while the kit ones were nice and tight after install. Beside giving me hold down bolts that were too long (had to use the old ones) it went well. Over 100 miles on them now and all's well.
02-25-2013, 02:22 PM
#6
I installed the Comp trunnion kit this weekend, didn't think I would like it. It really quieted down the valve train. I also noticed a lot of slop in the stock trunnions while the kit ones were nice and tight after install. Beside giving me hold down bolts that were too long (had to use the old ones) it went well. Over 100 miles on them now and all's well.
My car will be getting the Comp Cams Trunnion upgrade and your report is very positive.
02-25-2013, 02:33 PM
#7
Safety Car
I think we're getting of topic on this thread, but........Yes I bought a set of LS7 rockers, new, off this site, added the trunnion kit to them, didn't want to experement on my rockers, screw up, and then be dead in the water. I would be very careful installing these, there's lots of room for error but my results were good. Also since they're a sponser here I guess it's OK to say that I got a great deal on the CC TKit from Texas Speed!
Last edited by meanjoe; 02-25-2013 at 02:36 PM.
02-25-2013, 02:59 PM
#9
I think we're getting of topic on this thread, but........Yes I bought a set of LS7 rockers, new, off this site, added the trunnion kit to them, didn't want to experement on my rockers, screw up, and then be dead in the water. I would be very careful installing these, there's lots of room for error but my results were good. Also since they're a sponser here I guess it's OK to say that I got a great deal on the CC TKit from Texas Speed!
02-25-2013, 03:45 PM
#10
Race Director
Thread Starter
His very simple comment was that either bronze guides OR roller tip rocker arms would solve this issue if done at the factory. He didn't discuss roller tip'd rockers with me much, I ran out of time, but he had made some statements about the formulation of the sintered guides from the factory. Nice pieces if the set up is correct. Self consuming once they start to wear, though.
02-25-2013, 03:54 PM
#11
Safety Car
His very simple comment was that either bronze guides OR roller tip rocker arms would solve this issue if done at the factory. He didn't discuss roller tip'd rockers with me much, I ran out of time, but he had made some statements about the formulation of the sintered guides from the factory. Nice pieces if the set up is correct. Self consuming once they start to wear, though.
02-25-2013, 03:56 PM
#12
Race Director
Thread Starter
I am taking pictures as I move along. There really isn't "good" stuff to see right now, as I have all fuel system related pieces off and the intake and intake manifold. I will be removing the alt, PS bracket/tank, and the I am at the good stuff. Valve covers are still on and intakes are stuffed, to prevent anything going in, but the coil packs and such on the covers is removed. Had fun with the brake booster line off the back of the manifold....
02-25-2013, 04:06 PM
#13
His very simple comment was that either bronze guides OR roller tip rocker arms would solve this issue if done at the factory. He didn't discuss roller tip'd rockers with me much, I ran out of time, but he had made some statements about the formulation of the sintered guides from the factory. Nice pieces if the set up is correct. Self consuming once they start to wear, though.
02-25-2013, 05:04 PM
#14
Hey
Are you going to post updated on your progress with a pic or 2 along the way. It would be interesting to watch along while your at it. I also have a 2007 Z, 4000 miles and I'm already worried. Mine was built in 9/06 what is your production date?
Good luck with the head swap, I'm not too far behind you.
Are you going to post updated on your progress with a pic or 2 along the way. It would be interesting to watch along while your at it. I also have a 2007 Z, 4000 miles and I'm already worried. Mine was built in 9/06 what is your production date?
Good luck with the head swap, I'm not too far behind you.
02-25-2013, 06:15 PM
#16
Race Director
Thread Starter
Well, everything is out that is in the way. All that needs to come off now is the valve covers, crank motor over to #1 TDC, remove rockers/pushrods, drop the 2 remaining exhaust manifold bolts on each head and unbolt them. Should have them on the floor tonight. The cool pictures will be up once they are off. Just don't see the need to post pix of the basic stuff done so far. The PS bracket wasn't terrible. I just walked the 2 bolts that don't hold the reservoir out a few turns at a time until it fully backed out.
02-25-2013, 06:26 PM
#17
Race Director
Thread Starter
Just some interesting info for anyone. I have removed everything so far with the fans in place, the ABS module is untouched so far, the coolant was in the car and all lines on until I actually decided to pull the intake. I'm not sure if it can be put back together this way, as I foresee a bunch of problems with the PS bracket. Once it is all off and the heads are in for service, I'll take another look at the engine bay and see if I will remove the fans and loosen the ABS module for the re-install of the heads. The reservoir for the PS pump was more difficult this way, as there is very little room to move it and get it off the bracket.
02-25-2013, 10:11 PM
#19
I am very excited right now. While it looks to be a bit of work tearing the heads off, I have done this on many other engines. It is just a matter of time now.
10K miles on my Z06, 2007 model. #4 spark plug came out dripping wet with oil. Just above idle "knock" like noise that is worrisome.
My heads are going to go to Reher Morrison in Arlington, TX for Darin Morgan to massage into shape. Looks like a mild bump in compression (clean up mill), PP for mid range torque with the idea of bumping up to a mild cam late this year, bronze guides, new solid SS exhaust valves, and all Ti stem hardware. The stock intakes will be reused after cleaning up and some prep work.
I am going to have them measure the stock guides in place to give some additional information to the "oil on plugs" theory that floats around in here. Some believe it to be a real danger sign, others believe it is just a seal or even a valve cover seal(not such leakage on my Z). Best case is that it is just a valve seal on my Z06, but with the additional finds I made, I believe the exhaust guides on my right head are shot for sure and the left head is certainly up for debate. I will know for sure in 2-3 weeks.
Just idled the Z into location in the garage and she is cooling down. Gonna put her up on stands to help with my back during this, I am 6'5", and provide quick access to whatever I made need under the car during the work.
After my discussion with Darin Morgan, I have also decided to run the Yella Terra RRs I already have. I will be using the UMI spacer on the valve covers, though, and not the YT spacer gasket.
This should be fun. The adventure begins.
10K miles on my Z06, 2007 model. #4 spark plug came out dripping wet with oil. Just above idle "knock" like noise that is worrisome.
My heads are going to go to Reher Morrison in Arlington, TX for Darin Morgan to massage into shape. Looks like a mild bump in compression (clean up mill), PP for mid range torque with the idea of bumping up to a mild cam late this year, bronze guides, new solid SS exhaust valves, and all Ti stem hardware. The stock intakes will be reused after cleaning up and some prep work.
I am going to have them measure the stock guides in place to give some additional information to the "oil on plugs" theory that floats around in here. Some believe it to be a real danger sign, others believe it is just a seal or even a valve cover seal(not such leakage on my Z). Best case is that it is just a valve seal on my Z06, but with the additional finds I made, I believe the exhaust guides on my right head are shot for sure and the left head is certainly up for debate. I will know for sure in 2-3 weeks.
Just idled the Z into location in the garage and she is cooling down. Gonna put her up on stands to help with my back during this, I am 6'5", and provide quick access to whatever I made need under the car during the work.
After my discussion with Darin Morgan, I have also decided to run the Yella Terra RRs I already have. I will be using the UMI spacer on the valve covers, though, and not the YT spacer gasket.
This should be fun. The adventure begins.
Good luck with the build.
02-25-2013, 10:47 PM
#20
Race Director
Thread Starter
3M automotive tape, 223, used for the drive when I brought it home to Houston from Washington State. Previous owner lives up there and I didn't want to subject the 6K miles Z to any serious chips on the way home
Worked greatI pulled everything tonight except the last 10 large head bolts on each head. Stopped and organized everything. I also spent some time looking for a exhaust manifold bolt I lost and I think it is sitting up on the cradle somewhere not visible. I am going to have to feel around for it some more tomorrow.
I will get the heads off first thing tomorrow and clean up the surface on the block. Gonna blow all the holes out and get all coolant off the surfaces. I think I will spread a thin coat of oil on the cylinder walls after that and cover it up. Heads will be out at least 2 weeks according to Darin. It will be a long 2, but time to get all the needed replacement parts lined up and chase all the bolt holes clean.