427/425 - Impala Tech
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post #1 of 15 (permalink) Old 12-05-2016, 04:11 PM Thread Starter
 
 
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427/425

i have run across a 69 impala with the numbers matching 427/425 engine still in the car. The car was wrecked in late 1970 and has been sitting since then. Will this car have any significant value?
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post #2 of 15 (permalink) Old 12-05-2016, 06:36 PM
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Welcome to the Team!

The 427 BBC installed in the Impala was the 390 horse Passenger variant, not the High Performance (with rectangular port heads and a solid tappet cam). You could only get the 425 horse version in the 427 SS impala versus an Impala SS with a 427 engine.

The SS 427 was separate model and the hood alone is worth nearly $12,000. !969 was the last year Chevy offered an SS 427 Impala and there were very few made as every one who wanted a high performance big block was buying them in lighter cars than the big heavy Impala.

You or a prospective buyer can easily pull one of your valve covers. If it says PASS under the valve cover it is a 390 horse 427, or a 350 horse 396. If it says HiPerf then the engine could be worth up to $5000 to some one who wants one for their Corvette restoration project.

You can tell if that is the born with motor as starting in 1967, the car's partial VIN was stamped onto the front ID pad of the engine under the alternator. The ID pad also will have the application code that will tell you the engine displacement, whether it had a four barrel or two barrel, or what tranny was bolted to the back of it when it was built, along with the build date.

Big Dave
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post #3 of 15 (permalink) Old 12-06-2016, 12:10 AM
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Yes, certainly it will have great value. You have confirmed it's the matching engine? That would make a big difference in the value. As far as I've seen, for 69 you could get the L72 in any model from Biscayne up. There is nothing special about the 69 hood, they are all the same. 67 and 68 SS427 cars have a unique, valuable hood.
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post #4 of 15 (permalink) Old 12-06-2016, 08:44 AM Thread Starter
 
 
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The stamp on the engine block are as follows: T0522LS97Y0 followed by matching vin #. From what i can gather the LS is a 427/425, am i wrong?
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post #5 of 15 (permalink) Old 12-06-2016, 10:28 AM
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Can you expand on the "wrecked" description a little more for us? What does the car need? Pictures would be great, too! Nice find, we look forward to hearing/seeing more about it.

Two doors, four doors, wagons, and ragtops.
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post #6 of 15 (permalink) Old 12-06-2016, 10:40 AM Thread Starter
 
 
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This is all i have for now. This is a 4 dr. car and i am sure it does not have the value of a 2 dr. , but any thoughts on what it may be worth? The car is for sale and i am reluctant because of the 4 door.
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post #7 of 15 (permalink) Old 12-06-2016, 10:52 AM Thread Starter
 
 
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Sorry to present myself as dumb but as you can tell i know nothing about the impalas, i have only fooled with the camaros and mustangs. I just cant understand why this engine was placed in a four door car. Is this normal?
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post #8 of 15 (permalink) Old 12-06-2016, 11:10 AM
 
 
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Engine assembly plant: T= Tonawanda, New York.
Engine was assembled in May, day 22.
Engine assembly code "LS" was used for the following vehicles:
Year
Model
Engine
Horsepower
Code
1969
Chevrolet
427cid, SHP 3Spd. Auto Trans. TH400.
425hp
LS
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post #9 of 15 (permalink) Old 12-06-2016, 11:12 AM
 
 
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This might have been used to tow something like a boat or a trailer going to the Drag Strip.
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post #10 of 15 (permalink) Old 12-06-2016, 11:51 AM
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425 horse is a high compression (11.0:1) closed chamber engine that will not run on todays gas. Has small (by today's standards) intake and exhaust valves. And as I mentioned earlier it has flat tappet solid lifters that will not live long with the spring pressure of a solid cam combined with today's motor oil (low levels of ZDDP compared to the sixties), and due to it's small displacement and huge intake ports (320cc) it is a dog on the street. This engine was used to win races in NASCAR and while drag racing as it only makes power above 4,800 RPM. Not what I would ask for in a tow vehicle.

Only a person who owns a Corvette or is building a COPO Camaro clone would use the engine as is. This limits the number of buyers and how much they are willing to pay.

Because of modern gas and motor oil you would use that four bolt block to build a flat topped piston 496 and replaced the HiPerf heads with oval port passenger heads and remachine the PASS heads to accept 2.30" intakes and 1.88" exhaust valves. Then you would have a good street engine that will still make the advertised 425 horse, only with a lot more bottom end torque depending upon your hydraulic roller cam choice.

The alternative is to live in the sixties and run it on race gas (it used to burn 106 octane Sunoco 260 or American white gas from the gold colored pump). You will have to add GM EOS (Engine Oil Supplement) to get the required level of Zinc and Phosphorus in your oil at every oil change. You will still have a high performance race car engine in your two ton Impala but once you get it above 118.3 mph (assumes a 3.23 rear gear) you will really feel the power start to come on. (it would be a more reasonable 93.6 mph if you have a 4.10 rear gear: I used to run a 5.13 with this motor in my Camaro on the street back in 1968).

There was a special hood on the 1969 SS 427 Impala but there were not a lot of them made.

Big Dave
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post #11 of 15 (permalink) Old 12-06-2016, 12:48 PM
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Quote:
Originally Posted by mdawson View Post
This is all i have for now. This is a 4 dr. car and i am sure it does not have the value of a 2 dr. , but any thoughts on what it may be worth? The car is for sale and i am reluctant because of the 4 door.

I have to say, if you have found a matching numbers 4 door L72 car, grab it! That's gotta be a rare piece, darn near 1 of 1... That would be cool!!!
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post #12 of 15 (permalink) Old 12-06-2016, 12:50 PM
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[QUOTE=Big Dave;184562

There was a special hood on the 1969 SS 427 Impala but there were not a lot of them made.

Big Dave[/QUOTE]

Dave, please check out this link---



1969 Impala SS427 Exterior Details
62BillT likes this.
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post #13 of 15 (permalink) Old 12-06-2016, 07:56 PM
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Interesting read. Lots of good information.
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post #14 of 15 (permalink) Old 12-06-2016, 09:07 PM
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I stand correct. Sorry for the miss information.

Big Dave
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post #15 of 15 (permalink) Old 12-06-2016, 11:47 PM
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No worries. I can't believe how crazy the price has gotten for 67-68 SS hoods. But, they are pretty cool hoods, and pretty cool cars too!
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