new 427 LT-1 engine question
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
new 427 LT-1 engine question
I just put in a new/rebuilt 427 LT-1, ( or maybe not, as I am finding out) into my 1992 vette. Problem I have is after running it for 300-400 miles, 75mph on freeway, after being stopped/off for about 10 minutes, and then restarted, it blows blue smoke out of both sides of the exhaust pipes. The smoke goes away after about 2-3 minutes of idling. Other wise it runs great, no smoke, runs cool and getting around 19.8mpg. This is the first long trip I have taken it since the new motor was installed. 2,800 miles on motor.
Last edited by 2012 coupe; Mar 28, 2011 at 03:46 PM. Reason: update
Safety Car
Joined: Sep 2001
Posts: 4,157
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From: Glenbeulah Wi
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
Actually, you can make a 427 out of a 350. I wouldn't recommend it though, and I don't know anybody that has tried it. 4.060 X 4.125. A 4.125" stroke is a PITA, and the 4.060" bore would probably make the cylinder walls thin depending on the block. And there would be no rebuilds left in the block afterwards.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
Last edited by tpi 421 vette; Mar 28, 2011 at 01:16 PM.
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
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Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
Problem
Actually, you can make a 427 out of a 350. I wouldn't recommend it though, and I don't know anybody that has tried it. 4.060 X 4.125. A 4.125" stroke is a PITA, and the 4.060" bore would probably make the cylinder walls thin depending on the block. And there would be no rebuilds left in the block afterwards.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
Could be a "383" instead of a 427? Just looked at sales invoice, says, "Corvette LTx"
I bought it as a "long block" from a builder in WA, state last October. I am going by what they said. I had it delivered to the shop that installed it, that is another whole story in it self. The more problems I have with it, the more I think I should of just rebuilt the old LT-1 with 286,000 miles on it.
Last edited by 2012 coupe; Mar 28, 2011 at 03:50 PM. Reason: update
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
Actually, you can make a 427 out of a 350. I wouldn't recommend it though, and I don't know anybody that has tried it. 4.060 X 4.125. A 4.125" stroke is a PITA, and the 4.060" bore would probably make the cylinder walls thin depending on the block. And there would be no rebuilds left in the block afterwards.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
There are no aftermarket blocks for a LTX that I know of that you can use a 4.125"+ bore.
Last edited by 93VettePilot; Mar 28, 2011 at 11:03 PM.
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
I have done a 4.125" stroke before... I have one in my car 450ci 4.165X4.125. And you definately will hit water. That is why you must low fill the block. Because you will end up going thru the block doing it. It's not like a 1/2" hole. Maybe 1/16" to 1/8".
Block filler isn't a bad thing. A low fill to the bottom of the freeze plugs will seal the block and make it stronger.
Block filler isn't a bad thing. A low fill to the bottom of the freeze plugs will seal the block and make it stronger.
Last edited by tpi 421 vette; Mar 29, 2011 at 12:14 AM.
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
Cruise-In VI Veteran
Cruise-In VII Veteran
Could be a "383" instead of a 427? Just looked at sales invoice, says, "Corvette LTx" I bought it as a "long block" from a builder in WA, state last October. I am going by what they said. I had it delivered to the shop that installed it, that is another whole story in it self. The more problems I have with it, the more I think I should of just rebuilt the old LT-1 with 286,000 miles on it.
I bought it as a "long block" from a builder in WA, state last October. I am going by what they said. I had it delivered to the shop that installed it, that is another whole story in it self. The more problems I have with it, the more I think I should of just rebuilt the old LT-1 with 286,000 miles on it.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
I have done a 4.125" stroke before... I have one in my car 450ci 4.165X4.125. And you definately will hit water. That is why you must low fill the block. Because you will end up going thru the block doing it. It's not like a 1/2" hole. Maybe 1/16" to 1/8".
Block filler isn't a bad thing. A low fill to the bottom of the freeze plugs will seal the block and make it stronger.
Block filler isn't a bad thing. A low fill to the bottom of the freeze plugs will seal the block and make it stronger.
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
Motor
Safety Car
Joined: May 2002
Posts: 4,659
Likes: 82
From: Toronto ontario
I don't understand how anyone can buy an engine without knowing what exactly it consists of. A (supposedly) rebuilt engine can be a few hundred $ to $20k or more. Not knowing what you are getting I like writing a blank cheque.