C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Jan 11, 2016 | 01:44 PM
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Ok I've got to open the top end, the motor is locked up.I'm assuming that it's a hydrolock condition. I can smell fuel on the oil dipstick and white smoke was blowing out of the exhaust. My question is after I had my heads cleaned,shaved, all new gaskets, fluids, sensors a year or two later the same problem? Why would I have coolant going straight through the exhaust and fuel in the oil. Thanks for your help.
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Old Jan 11, 2016 | 01:52 PM
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I would just take out the spark plugs and turn it over and see what comes out. if just fuel it could be the fpr or leaking injector. be safe and smart don't want a fire.

Last edited by antfarmer2; Jan 11, 2016 at 01:54 PM.
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Old Jan 11, 2016 | 02:00 PM
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Yeah thanks, I pulled out the #4 then #2 (broke the tip of that one ). Just looking at those threads, rusty. I'm a bit nervous to crank it over even though the plugs are pulled, I don't want to break a rod or worse.
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Old Jan 11, 2016 | 02:09 PM
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Originally Posted by wireman1
Yeah thanks, I pulled out the #4 then #2 (broke the tip of that one ). Just looking at those threads, rusty. I'm a bit nervous to crank it over even though the plugs are pulled, I don't want to break a rod or worse.
pull them all!!!!!!! and turn by hand first.

Last edited by antfarmer2; Jan 11, 2016 at 02:23 PM.
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Old Jan 11, 2016 | 05:27 PM
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You have to pull all the plugs not just two. Then try turning the motor over by hand first using a 5/8 (six point) socket in the balancer and a breaker bar.

You more than likely have a blown head gasket.
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Old Jan 11, 2016 | 06:23 PM
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Originally Posted by John A. Marker
You have to pull all the plugs not just two. Then try turning the motor over by hand first using a 5/8 (six point) socket in the balancer and a breaker bar.

You more than likely have a blown head gasket.
White smoke out of the exhaust is indicative of a blown head gasket or (worse) a cracked cylinder head.

Were the correct head gaskets used during the last rebuild. Did you have the heads pressure tested. Were the bolts torqued to the correct value and in the correct sequence? If you had a fair amount milled off the head surface, was the intake manifold milled to compensate?

I would just go ahead and pull the heads without worrying about whether or not the engine will turn. Once the heads are off, the crank will be much easier to turn by hand. If the crank won't turn a full 360 degrees, then you may have even more serious problems.
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Old Jan 11, 2016 | 07:51 PM
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what year?
Originally Posted by c4cruiser
White smoke out of the exhaust is indicative of a blown head gasket or (worse) a cracked cylinder head.

Were the correct head gaskets used during the last rebuild. Did you have the heads pressure tested. Were the bolts torqued to the correct value and in the correct sequence? If you had a fair amount milled off the head surface, was the intake manifold milled to compensate?

I would just go ahead and pull the heads without worrying about whether or not the engine will turn. Once the heads are off, the crank will be much easier to turn by hand. If the crank won't turn a full 360 degrees, then you may have even more serious problems.
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Old Jan 24, 2016 | 10:56 AM
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92lt1vette, new felpro gasket set, durolast head bolts, and I didn't mill the intake.
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Old Jan 24, 2016 | 11:01 AM
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Originally Posted by wireman1
92lt1vette, new felpro gasket set, durolast head bolts, and I didn't mill the intake.
All is good?
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Old Jan 24, 2016 | 01:40 PM
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Originally Posted by DaCapt
All is good?

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Old Jan 24, 2016 | 05:22 PM
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I've got to get the pesky manifold out of the way,then the heads are off! !!
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