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View Full Version : 1983 AVANTI with Chevy 350 bored 30 over balanced & blueprinted Engine...Does it add value?



GOTLUCKY
11-05-2018, 03:57 PM
I just checked the NADA Value for my 1983 Avanti and the Average Retail is shown as $20,100. I am assuming that is with the basic 305 Engine.

If my Avanti has a Chev 350 bored over 30 and has been balanced and blueprinted, does that increase the value or decrease the value?
Does it just depend on the Buyer wanting either a muscle car willing to pay more or a Purest wanting one to restore to original specs wanting to pay less?

Xcalibur
11-05-2018, 04:03 PM
Depends what it came with. My '82 came with one of the p.i.t.a. 5-liters with the notorious "soft" camshafts. At around 40K miles I pulled it, sold it to a local kid to rebuild for his pickem-up truck, and dropped in a new crate 350 from Scroggins & Dickey. Best thing that ever happened to the car! All the best.

StudeRich
11-05-2018, 04:06 PM
I think the largest Value gain would be the fresh quality rebuild, not so much the 350 vs 305.

With Automatic and High Ratio rear axles, these are really not much of a Muscle Car.

70Avanti2
11-05-2018, 04:14 PM
Don't think it increases the value of the car. But will make it easier to sell.

GOTLUCKY
11-05-2018, 04:46 PM
Thanks for the comments and replies....In search for the paperwork the original purchaser in Texas had as I believe it came with a 305 and he replaced it with the 350.

Buzzard
11-05-2018, 04:47 PM
Seeing as I own an '83 and have the same dilemma, (anemic 305 requiring some compression and horsepower), I have started to build a 406 CID Small Block for the same reasons. Doing something like this will rarely yield more value except to that very discerning purchaser who wants exactly what you have created. I don't think there are very many crazies like us out there, but hey, ask Xcalibur for a second opinion.
Have you purchased the motor yet? Check the web site for Skip White Performance https://www.skipwhiteperformance.com/
(https://www.skipwhiteperformance.com/)







There is some excellent information there which may assist you in your purchase. Check out his turn key 406 CID.
Luck,
Bill

GOTLUCKY
11-05-2018, 05:15 PM
I am the 3rd. Owner and that engine was already in the car. The 2nd. Owner purchased the car in the early 90's with the upgraded engine in it. The car only has 88,500 miles on it, so not sure how many miles were on the original engine and how many are on this engine.

TWChamp
11-05-2018, 05:20 PM
Depends what it came with. My '82 came with one of the p.i.t.a. 5-liters with the notorious "soft" camshafts. At around 40K miles I pulled it, sold it to a local kid to rebuild for his pickem-up truck, and dropped in a new crate 350 from Scroggins & Dickey. Best thing that ever happened to the car! All the best.

I'm surprised that GM was still having soft cam problems in 82, as I worked at the GM dealership in the mid 70's, and was replacing soft cams and tappets back then.
Guess GM was slow to learn.

sweetolbob
11-05-2018, 05:32 PM
Thanks for the comments and replies....In search for the paperwork the original purchaser in Texas had as I believe it came with a 305 and he replaced it with the 350.

The 350 is certainly an upgrade over the anemic 305 that it came with. As far as value, I'd first look at what that era cars have actually sold for on the open market. I'd be surprised if they went for anywhere near $20K. These cars have never been highly valued in the used/classic car market for a number of reasons.

As far a value increasing with the addition of a better engine, I'd suspect it wouldn't increase the value anywhere near the cost of the upgrade.

Look below and you can see I own two, an 83 and 74. The 83 I bought about 10 yrs ago for $7500 and it's about average for an 83. It now has a 355 EFI Roller SBC. The 74 has a 383 stroker SBC. Both are much more fun to drive.

I doubt you'll ever see the value of the engine upgrade in price increase but you will have a vehicle that performs as good as it looks.

Avanti, Bob

PackardV8
11-05-2018, 05:42 PM
Yes, No, Maybe. Since the AII is not a nut-ball-numbers-matching collectible, it's difficult to imagine a scenario where having a $2500 - $5,000 engine upgrade wouldn't add considerable value. What buyer's going to say, "No, I'd buy it if it had the original worn-out slug 305" but not with identical appearing new 350" with 50% more power." ; not many.

jack vines

GOTLUCKY
11-05-2018, 06:07 PM
Thanks Bob for your reply and comments....

So doesn't NADA use the sales information of each Avanti by year to obtain that Average Value of $20,100. they provided? I have always used it as a guide when purchasing other cars paying a little higher or lower based on condition, options and mileage. Are Classic Cars different due to their rarity? This engine upgrade also included Hooker Headers and Roller Rockers.

GOTLUCKY
11-05-2018, 06:15 PM
Yes, No, Maybe. Since the AII is not a nut-ball-numbers-matching collectible, it's difficult to imagine a scenario where having a $2500 - $5,000 engine upgrade wouldn't add considerable value. What buyer's going to say, "No, I'd buy it if it had the original worn-out slug 305" but not with identical appearing new 350" with 50% more power." ; not many.

jack vines

Well Jack ....I had a prospective purchaser who I would classify as a Purist who wanted that worn out slug 305 engine so he could restore it as original....Yes, they are out there....;o)

rodnutrandy
11-05-2018, 06:45 PM
Depends on buyer ,some want original and some would be happy with more grunt !

Silverplate
11-05-2018, 06:48 PM
If someone is set on obtaining an original 83 Avanti it would decrease the value. Otherwise probably not much at all.

sweetolbob
11-05-2018, 07:25 PM
Thanks Bob for your reply and comments....

So doesn't NADA use the sales information of each Avanti by year to obtain that Average Value of $20,100. they provided? I have always used it as a guide when purchasing other cars paying a little higher or lower based on condition, options and mileage. Are Classic Cars different due to their rarity? This engine upgrade also included Hooker Headers and Roller Rockers.

GL, I can't speak to how NADA arrives at their values but I know when I insure my Avanti's the agreed upon value is much lower than the value you quote. If you look at the value of early 80's on Hagerty's site you will see they claim $10-13K for average condition.

Not saying really good ones can't go higher. Heck, there was an 83 for sale built by Fantomworks that was going for $49K. Of course the owner had spent over $150K on the build.

In my mind, unless it's a special or fully restored unit, they are best driven and not thought of as an investment.

As others have said, eye of the beholder.

IAC, that 350 in your Avanti has improved it's enjoyment many-fold.

Bob

studegary
11-05-2018, 09:10 PM
I do not believe that the engine change will add much to the sale price. It may make it an easier sale. I do not see nice (not mint) Avantis of that vintage going for $20k. [I have bought and sold many cars including Avantis and think that I keep fairly close to real world values (there are always those that ask all kinds of prices).]

Skip Lackie
11-06-2018, 08:23 AM
We gotta remember that any sales price data base (Hagerty, NADA) has to be based on real data. How many 83 Avanti IIs sell in a year? Avanti Motors never built more than a couple of hundred cars a year, so no more than a handful ever change hands in a given time period. We're not talking Mustangs here. And given the fact that authenticity is not much of a factor in value for AIIs, the condition of one or two sold cars can affect the average. I have always found the listed value of AIIs to be optimistic.

t walgamuth
11-06-2018, 08:45 AM
I agree with not much value increase but easier to sell with a fresh more muscular engine.

GOTLUCKY
11-06-2018, 09:04 AM
GL, I can't speak to how NADA arrives at their values but I know when I insure my Avanti's the agreed upon value is much lower than the value you quote. If you look at the value of early 80's on Hagerty's site you will see they claim $10-13K for average condition.

Not saying really good ones can't go higher. Heck, there was an 83 for sale built by Fantomworks that was going for $49K. Of course the owner had spent over $150K on the build.

In my mind, unless it's a special or fully restored unit, they are best driven and not thought of as an investment.

As others have said, eye of the beholder.

IAC, that 350 in your Avanti has improved it's enjoyment many-fold.

Bob


Good Morning and thanks again for your reply.... WOW !! Amazing the "Love" some have put into their Avantis....

Sadly, I am in the process to advertise mine For Sale and this post is helping me to start with a Fair Price.
The NADA LOW is 12,900. AVG. 20,100. and HIGH 30,700. The car's odometer reads 88,494, has wire wheels and a NARDI steering wheel.

I have begun restoring it to a fun enjoyable ride with the following restorations in the past 3 years so driven less than 500 miles:
New Radiator, Electric Fuel Pump and Fuel Line, Full Front Brake Change Over Pkg., Front & Back Shock Absorbers, 4 BFG Radial TA Tires, Chassis Wire Harness, Battery, Ignition Starter & Lock Cylinder, Edelbrock Air Filter with lower wider profile. The front seats were reupholstered in a vinyl that matches the leather backseat as I was not planning on competing in car shows.

Buzzard
11-06-2018, 12:26 PM
Susan,
Good luck with selling your fine looking Avanti. I'm sure you will find the appropriate and appreciative purchaser as they are out there. It would be an unfair comparison for me to compare yours' with my totally original (except for Michelin tires) 25,000 original mile car which sadly, has been stored more than driven over it's lifespan. Nate Altman told me many years ago, that on average (I think he was talking of un-modified) his cars were worth in the order of 50-70% of their original delivered price. That being said, and I'm using the recent sale by Matthew Burnette of his '67, you should realize in the neighborhood of the high teens for your car. Obviously there are many contributing factors to ascertain each individual cars' true value but it's a starting point.
Good luck with your sale.
Bill

jpepper
11-06-2018, 01:01 PM
I just checked the NADA Value for my 1983 Avanti and the Average Retail is shown as $20,100. I am assuming that is with the basic 305 Engine.

If my Avanti has a Chev 350 bored over 30 and has been balanced and blueprinted, does that increase the value or decrease the value?
Does it just depend on the Buyer wanting either a muscle car willing to pay more or a Purest wanting one to restore to original specs wanting to pay less?

Your 83 came with a basic engine control computer and a feedback style Quadrajet carburetor. It also had EGR and an air injection pump. If those devices were retained during the engine change, value is unaffected. By this I mean the 350 has the same value as a good running 305. If during the upgrade all the emission components were discarded and the engine bay appears hacked, value will suffer. The 350 engine may help sell the car, all things being equal.

GOTLUCKY
11-06-2018, 02:09 PM
We gotta remember that any sales price data base (Hagerty, NADA) has to be based on real data. How many 83 Avanti IIs sell in a year? Avanti Motors never built more than a couple of hundred cars a year, so no more than a handful ever change hands in a given time period. We're not talking Mustangs here. And given the fact that authenticity is not much of a factor in value for AIIs, the condition of one or two sold cars can affect the average. I have always found the listed value of AIIs to be optimistic.

Thanks Skip....I do realize the shortage of sales does make it more difficult to get a true picture of the market and values. The fun I have had driving my car and the nice Avanti owners who have shared their knowledge has been wonderful.

GOTLUCKY
11-06-2018, 02:24 PM
Susan,
Good luck with selling your fine looking Avanti. I'm sure you will find the appropriate and appreciative purchaser as they are out there. It would be an unfair comparison for me to compare yours' with my totally original (except for Michelin tires) 25,000 original mile car which sadly, has been stored more than driven over it's lifespan. Nate Altman told me many years ago, that on average (I think he was talking of un-modified) his cars were worth in the order of 50-70% of their original delivered price. That being said, and I'm using the recent sale by Matthew Burnette of his '67, you should realize in the neighborhood of the high teens for your car. Obviously there are many contributing factors to ascertain each individual cars' true value but it's a starting point.
Good luck with your sale.
Bill

Thank you Bill...The 2nd. owner, who I bought the car from, is still looking for the folder he received from the 1st./Original Owner that contained the receipts from the upgrades he made to the car. I believe he said the 350 engine was installed by a shop in San Antonio. From those receipts I should be able to determine how many miles are on the 350 engine. I do know that it also has Hooker Headers and Roller Rockers and probably a lot more enhancements that might add some more value.

GOTLUCKY
11-06-2018, 02:32 PM
Your 83 came with a basic engine control computer and a feedback style Quadrajet carburetor. It also had EGR and an air injection pump. If those devices were retained during the engine change, value is unaffected. By this I mean the 350 has the same value as a good running 305. If during the upgrade all the emission components were discarded and the engine bay appears hacked, value will suffer. The 350 engine may help sell the car, all things being equal.

Hi James.....Thanks for the info. So there were no options for different engines? So far I know that it is a Chev 350 bored 30 over balanced and blueprinted and that it also has Hooker Headers and Roller Rockers. I am hoping the 2nd Owner can find that folder of receipts that the Original Purchaser had given to him to determine any additional enhancements.