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Old 04-05-2018, 12:08 AM   #1
Galaviz06
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2007 Z06 coolant in the oil

Hello there, recently bought a 2007 Z06 with 30k on it. New block, sleeves, forged pistons, ported polished heads, boost cam and a P1 Procharger. Drove the car 800 miles home with no issues. Got home drove it around a couple weeks and the low coolant light came on. Come to find out there was coolant in the oil. Went ahead and replaced head gaskets and today drained the oil for the second time in 100 miles aince the head gasket replacement and found coolant in the oil stil (maybe about a quart worth of coolant). Heads were machined and inspected, block seemed fine, sleeves looked good, no evident signs of cracks. Not sure if it was old coolantnin there or new one. Reservoir did drop in level of coolant about 2 inches (which I thought was fine, i figured there was pockets of air and it was working its way out) not sure what else to do!
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Old 04-05-2018, 07:36 AM   #2
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Napa parts store sells a Block Combuation Leak Tester kit.
About $35.
Buy it.
Follow the directions.
Easy to use.
If the fluid turns from Blue to Pee yellow there is a problem.
If stays Blue your A Ok.

LS Heads are strong.
Can take 40 psi boost without cracking.

Blocks are so so stock.
30 psi boost with a good tune.
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Old 04-05-2018, 07:57 AM   #3
Galaviz06
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Quote:
Originally Posted by Maniacmechanic1 View Post
Napa parts store sells a Block Combuation Leak Tester kit.
About $35.
Buy it.
Follow the directions.
Easy to use.
If the fluid turns from Blue to Pee yellow there is a problem.
If stays Blue your A Ok.

LS Heads are strong.
Can take 40 psi boost without cracking.

Blocks are so so stock.
30 psi boost with a good tune.
Will do that today. Thanks for the suggestion. Hopefully there arent any cracks in the galley or similar from the sleeving. Block has about 4k on it.
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Old 04-05-2018, 08:52 AM   #4
Maniacmechanic1
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https://www.napaonline.com/en/p/BK_7001006
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Old 04-05-2018, 08:56 AM   #5
Maniacmechanic1
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Quote:
Originally Posted by Galaviz06 View Post
Will do that today. Thanks for the suggestion. Hopefully there arent any cracks in the galley or similar from the sleeving. Block has about 4k on it.
Factory LS is not known for that issue.

Racing Pontiacs I could have bought a few SD455s.
But they did crack in the oil galleries sometimes.

So I always chose 2-bolt 455s.
Never had an issue with block failures.
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Old 04-05-2018, 09:04 AM   #6
Maniacmechanic1
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The heads may be lifting under boost.
Most likely scenario.
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Old 04-05-2018, 12:46 PM   #7
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Update: i drained the oil and have had it draining for 10-12 hours, ive ran about 6 quarts of oil through the motor with no drain plugs on it while ive been doing this, i put a cooling system pressure tester on the car at 22psi and its down to 21.5 in 90 minutes.
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Old 04-05-2018, 06:39 PM   #8
Maniacmechanic1
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Quote:
Originally Posted by Galaviz06 View Post
Update: i drained the oil and have had it draining for 10-12 hours, ive ran about 6 quarts of oil through the motor with no drain plugs on it while ive been doing this, i put a cooling system pressure tester on the car at 22psi and its down to 21.5 in 90 minutes.
Usually that rules out all.
But you have a Supercharged Boost Car.
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Old 04-06-2018, 07:17 AM   #9
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Ok.
Got your PM.

Aluminum just moves around too much under Boost Load.

Chevrolets Legendary 1969 ZL-1 all aluminum Big Block Chevy packing 550 Hp stock was good.
But it also leaked water everywhere sitting.
My Late bud Bill had a 1969 ZL-1 Camaro he special ordered new.
Loved it but said it always leaked.
Iron Block L88 Corvettes he had was superior for drag and street racing.

We want a 6.0 Iron Block LS Truck SUV Shortblock.
Or a 6.2 Iron LS.
LS3 Heads preferred.
600 HP Baseline engine before Boost is added.

Iron Block 6.0-6.2 LS is the modern way of Big Block Chevy or Pontiac 455 strength.
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