Donnybrooke Green '70 #s LT-1 Corvette Convertible

[napa68]

Ooooooffdah!

[olredalert]

----Tony,,,I got the same message. Someone got the deal of the year! I never saw the pad....Bill S

[scuncio]

Anyone from the site get it?

[Tracker1]

CTV suffix code wow, a ZR1 vert hiding in plain site. Jeez.

[tom406]

Here’s the stamp pad of a car built 6 units later. This serial number stamping is what I would consider typical for 1970 production.

[Mr70]

This from the Green/Green LT-1 seller:
Hi,we did have the car inspected and confirmed it was not a real ZR-1 and we are of the opinion it was re-stamped when it was restored as was the inspector.A very nice Stingray for sure,but it's not a real ZR-1.We had the Stingray inspected by an independent Classic car Appraiser who is very knowledgeable.Beyond the engine stampings,there are other indicators that this Corvette is not a ZR-1.ZR-1's did not have radios or shielding on the ignition wires or an antenna.This car has a radio,and you see where the hole for the antenna mount was filled in and painted over.
The M21 transmission,came from a '69 Nova and the rear end date codes are not correct.
It's missing some options/features that a ZR-1 would have.
It does have the right Block stampings and overall,a very nicely restored Stingray which drives exceptionally well and had the performance of a ZR-1,but without any historical data from Chevrolet to prove otherwise,it's not a ZR-1 in our opinion.
The buyer did collect the car,and as far as I know the car is still in our local area.

Kind regards,
David Bruski

[Lynn]

I was going to say restamp.

While on this topic; I know there are significant differences between a "plain" LT-1 and a ZR1 such as brakes, suspension and mandatory M22.

I have never been able to find a definitive answer on what would be different in the engine. There has to some difference to warrant a different engine code. And it can't just be the M22.

[markjohnson]

Originally Posted by Lynn

I was going to say restamp.

While on this topic; I know there are significant differences between a "plain" LT-1 and a ZR1 such as brakes, suspension and mandatory M22.

I have never been able to find a definitive answer on what would be different in the engine. There has to some difference to warrant a different engine code. And it can't just be the M22.

I’ve always wondered this exact thing. Maybe GM snuck the Off-Road camshaft into the LT1!

[TimG]

One difference is the clutch diameter. It's not unusual to see an LT1 assembly code ground and restamped as a ZR1 by changing out the clutch. I looked at a 1972 ZR1 that was prepared this way, no ZR1 engines, grind and restamp the LT1 code and change the clutch.

[Lynn]

So did the ZR1 use a 403 bell housing with 10.5 clutch. I know my LT-1 has 621 bell housing with 11 inch clutch.

Another member suggested it may be no ignition wire shielding because the ZR1 did not offer a radio.

Can anyone confirm?