It seems that there are more 3946052 ZL1 blocks popping up on ebay every day. From what I understood there were only 69 camaro's and 2 corvette,s and maybe 18 or so over the counter motors. And how do you tell if it is a over the counter motor from one that came in a car from a can am motor? I own one that doesnt have any dates or vin #'s on it, just a cast number. Mine came from Washington state and has a history of being in that state for at least 25-30 years or so.

From what I know and have run across in other cases that should one of the over the counter "crate" motors.

Try posting your question over at Yenko.net. Some of those guys hang here, but you might have better luck, there.

Does it have a O-Dash casting number? Dan

With 69 ZL-1s being made, I would think they would have 10 or 15 motors in reserve for warrenty? The 1968 Yenkos motors that were coded MV had 9 motors for back-up. (A total 70 COPO 9737s made with 79 motors being built)

According to Ed Cunneen's book:
complete engines:
Corvette ZL-1
Auto MG 14
Manual ME 103
Camaro 9560
Auto MM 34
Manual 54
Auto MV 1
Manual MX 1
Partial engines:
CE 57
unstamped 19

Total 283

Recently I was at the Turkey Rod Run over the holidays in Daytona and a guy was selling a complete ZL1 for $50,000...I got a pic i'll try and post later

I recently visited a shop where a ZL1 block was being coded for a ZL1 resto. It is amazing how the casting date codes can be reapplied to a block along with other important codes/numbers. All you need is a block and it can be transformed into an exact duplicate of the original block that came in the car.

Yea, but how many Yenko-crested aluminum blocks to add to Ed's total?

The Yenko crested blocks were advertised for sale in 1977 in National Dragster.I posted this ad on another site about a 2 years ago.If someone can post it for me I will email the ad to them....Dan

Yenko original blocks:30
Winters lockporte: less than 100
Yenko revised blocks:900

There was a lot of ZL1 blocks sold for racing, the McLaren CanAm cars had injected ZL1s in their cars.

I had one such block 25 years ago that had come to Sweden from England and McLaren. We was going to use it in our ProStock but we decided against it since we expected that it wouldn't hold up. So we sold it to a guy who was going to place it in his livingroom.

Jan