new 427 LT-1 engine question
They all look the same on the outside. And you can internal balance, so you would use the same damper as a 350. It would be hard to tell just looking at it.
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
engine
Thread Starter
Burning Brakes
Joined: Jun 2000
Posts: 913
Likes: 17
From: Chatsworth, Ga.
Update
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.
The company I bought the motor from is paying to have it stripped down to see what is the matter. They are paying for the parts and labor. Can't ask for a better deal then that.
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 196
From: folsom california
I researched it on the internet, call the people and talked to the person who built it, then got a sales invoice for what we had talked about. I paid people to replace it. I did not see it completed until I picked up the vette after 30 days delay in finishing it, because the garage was busy. That part of it is another story. I faxed the sales contract to my lawyer today and he will look into what we can do about it. I had to trust someones word, unfortunately both the engine and the people who installed it did not know what they were doing. It now runs great, except for the oil smoke for a few minutes after a long, 400 mile trip. Only lasts for a few seconds after restarting it. Runs great around town. I have only 2800 miles on the engine since Nov 2010. If I had to do it again, I would buy a new engine from GM and let them install it.
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
I think most of the GM crate engines are less than impressive. A guy on here a while back that I think owned a machine shop tore down a brand new ZZ4 crate engine. The industry standard for the rotating ***'y parts are less than 7 grams, that is acceptable. You won't feel a vibration. He checked the balance and the rods were 6 grams out of balance, the pistons were 5 grams out of balance and the crank was X amount grams out of balance. I am just going off memory here. But the whole thing was way out of balance, but within the industry standards. I guess my point is with a quality machine shop, those numbers can be alot better. The machine shop I use Strasberg Machine will balance to 1 gram or less. They build race engines. Precision machining makes a big difference. A more precise balanced engine will run smoother, last longer and make more power.
Last edited by tpi 421 vette; Apr 1, 2011 at 01:11 AM.
