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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 05-23-2010, 04:31 PM   #1
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Default Oil in coolant.. and coolant in oil

Head gaskets seem to be the culprit. I do have the questionable cosmetic gaskets in there. Is there a how to on a gasket swap?

Any other advice, tips, tricks, etc would be appreciated. My first time tearing into an ls1.

So far I am planning on following the how to at http://www.ls1howto.com/index.php?article=2 and ignoring the cam swap. I am planning on going with GM MLS gaskets and a GM head gasket kit, and swapping out my plugs while I am in there. Should I also replace my springs? They have 60k on them now, here is the kit info:

http://www.lmperformance.com/4190/1.html

Comp LS1 26921 Spring Kit - Dual Springs with spring seats, titanium retainers, and steel jacketed valve seals. These are race quality springs designed to handle up to .650'' lift. Installs in factory heads without modification.

and my cam:

DUR @ .004" 282* / 286*
DUR @ .050" 220*/ 224*
LIFT .551/.551
OVERLAP 57*
LSA 114*

Thanks for any help!
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Old 05-23-2010, 05:19 PM   #2
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I'm yanking my Cometics soon too. They are hit or miss!
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Old 05-23-2010, 06:32 PM   #3
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I've run Cometics twice and have had no problems. They are just very tempermental to surface prep. You need to make sure that the deck surface and head surface are spotlessly clean and use Copper spray sealant as well.
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Old 05-23-2010, 07:04 PM   #4
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I have done that everytime I have given them a try and still had one side or the other leak. Not always at first but eventually.
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Old 05-23-2010, 07:09 PM   #5
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I am runnign Titan copper ringed gaskets, been happy so far
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Old 05-23-2010, 07:16 PM   #6
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I'm going to try the GM MLS and see how that goes. APR Bolts will be reused.

Anyone know how often I should change my springs? Trying to make a parts list before tearing into it this week.
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Old 05-23-2010, 08:12 PM   #7
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Though yor cam is on the mild side I would drop some nice PAC beehives in there. Even if they are in spec now they are prolly nearing the end of their practical lifespan and it is SOOOO MUCH easier to do it when the heads are off the car....
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Old 05-24-2010, 05:35 AM   #8
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How do I flush the coolant out of the oil, and the oil out of the coolant?

Any experience on this?
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Old 05-26-2010, 07:18 AM   #9
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Car is torn apart now, heads are in the shop. I tried using a plastic scraper on the old gasket, but it isnt coming off. I switched to carb cleaner and a razor.

Anyone got any advice on flushing the oil out of the coolant? A buddy of mine said to run Cascade dish detergent through it once its back together.
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Old 05-26-2010, 08:55 AM   #10
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Quote:
Originally Posted by FbodyAttraction View Post
Car is torn apart now, heads are in the shop. I tried using a plastic scraper on the old gasket, but it isnt coming off. I switched to carb cleaner and a razor.

Anyone got any advice on flushing the oil out of the coolant? A buddy of mine said to run Cascade dish detergent through it once its back together.
Keep your buddy away from your car.


Straight vinegar should do the trick.
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Old 05-26-2010, 11:04 AM   #11
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Originally Posted by nysbadmk8 View Post
Keep your buddy away from your car.


Straight vinegar should do the trick.
Vinegar? I dont see where it would do anything to the oil. Vinegar would just corode any metal in my coolant system.
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Old 05-26-2010, 11:26 AM   #12
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DETERGENT? w..t..f?
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Old 05-26-2010, 11:28 AM   #13
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DETERGENT? w..t..f?
Yeah I know... right? And this guy is a mechanic. Vinegar wont even mix with oil, so that out of the question.

Maybe some liquid degreaser?
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Old 05-26-2010, 11:41 AM   #14
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im not 100% on how you can "clean" the oil/coolant out of your system. someone probably knows a method that works. but now that the heads are off you prob should swap springs. 60k miles on the current ones?
and a GM MLS head gasket is great, i run those with out any issues
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Old 05-26-2010, 12:01 PM   #15
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GM MLS is the way to go, I run them on my 347 and no problems what so ever.
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Old 05-26-2010, 12:26 PM   #16
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Quote:
Originally Posted by sidewayz28 View Post
im not 100% on how you can "clean" the oil/coolant out of your system. someone probably knows a method that works. but now that the heads are off you prob should swap springs. 60k miles on the current ones?
and a GM MLS head gasket is great, i run those with out any issues
I am having the head shop check them for heights and pressures. They should be able to let me know if they are out of spec. This spring kit is $650 so I am praying I dont have to replace them
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Old 05-26-2010, 12:42 PM   #17
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wait.. what?! a VALVE SPRING kit is $650?!!?!?!?!
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Old 05-26-2010, 12:44 PM   #18
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For the oil pan: just drain the oil pan, refill with cheap 5W-30 and put on a new filter, run it up to temp, then repeat the oil change with your normal oil flavor.

For the cooling system: most parts stores sell a flush kit that connects into your heater hose. I just pulled my big heater line off the water pump, added the kit's T-fitting, and was all set. You drain the rad, leaving the cap off and the drain petcock open. Connect a garden hose to the T-fitting, turn on your garden hose, then start the engine and run it to temp. All kinds of nastiness will dump out the rad.

edit: some liquid dishwashing detergent may not be a bad idea. Without some sort of surfactant to pull the oil off the surfaces, it's unlikely the flush will be fully effective.

When finished, remove the T-fitting and reconnect your heater hose to the water pump.

This is an option, but I use my ShopVac and pull the water from the engine by removing the top rad hose and applying the pickup nozzle to the hose end. It does a decent job of pulling the tap water out of the block cooling jackets...plus you'll want to funnel coolant down the top hose to refill the block when you're done.
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Last edited by crainholio; 05-26-2010 at 12:59 PM.. Reason: more detail.
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Old 05-26-2010, 01:32 PM   #19
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http://www.google.com/search?q=vineg...ient=firefox-a

Yes vinegar, you will have to run a surfactant.. thought that part would be common knowledge.

As for corroding your metal parts.. its a flush, not a coolant. Its only in there for an hour.
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Old 05-26-2010, 01:47 PM   #20
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Quote:
Originally Posted by sidewayz28 View Post
wait.. what?! a VALVE SPRING kit is $650?!!?!?!?!
Yeah... FML:

http://www.lmperformance.com/4418/43.html
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Old 05-26-2010, 01:47 PM
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