ZL-1 stamping numbers

[JoeC]

Kurt, his name on Team Camaro is JohnZ.
I also e-mailed him a copy of the COPO form that was in a magazine article about Kevin's COPO 427 1968 Camaro. Which is a subject still up for debate. Here is a copy of his reply.
"This is a normal COPO form, used to request production of a unit with equipment not in accordance with the released available production vehicle specifications.

What this form is requesting is to add the COPO 9737 Sports Car Conversion Package to two cars for which orders have already been submitted; the line entitled "Other RPO's....." identifies other options already ordered on the two units, which is why that line ends with "N/C", as those options have already been priced and charged on the original orders for those two cars, so there is no additional charge for them under the requested COPO.

The COPO 9737 cost $160.10, was available only on cars already ordered with the COPO 9561 427 package, and consisted of Z28 wheels and tires (E70x15 Goodyear Wide Tread GT's on 15x7 "YH" wheels, the Z28 Tire Pressure Sticker (code "DX"), and a 140 mph speedometer.

This form appears to add the 9737 package to two cars which were already ordered as 9561's, but adding the 9737 package was apparently overlooked when the original orders were submitted - this corrects the ordering error.

Best Regards,

John

[GMH454]

COPO, I will dig them out on the weekend. I keep writing them down, but I always forget where I put them. I don't think I had a date code on the engine pad. Porterfield showed me Chevy copy paperwork (now where did I put that) that showed my engine number was in the middle of a sequence of racing engines supplied in around 1971 ( I think ). Pretty sure date was not part of the numbers. Maybe that's what the 61A was.
Also were numbers like my 107 common to all ZL-1s. Whats your got?

[COPO]

Just went down in the basement, front pad is stamped TO307ML, down near the oil filter is stamped 19N620923, which is the VIN for car #51. (block came frome original owner of car #51) Caps are stamped 356, Raised casting date looks like 1 1969 then 472 under it. I have read that the 472 is an inventory number and it is directly below the casting date. These numbers are cast upside down on the passenger side of the block near the front of the engine. I'll look a bit more this weekend when I have more time to see if these ar additional markings.

[JoeC]

Do both of the ZL1 blocks have the Winters foundry snowflake casting mark in front above where the water pump would be? Also do they have the screw in freeze plugs or the std. type sheet metal freeze plugs. Just curious. Chevy was also selling a Can Am block with the 4.400 in. bore and siamese cyl. that was used for racing. I think this is the one that Yenko and Bill Smith sold in the 80's.

[COPO]

Winter's snowflake and screw in freeze plugs on mine. I've looked at the casting very carefully and it appears to be virgin stampings and the fact it was purchased from the original owner of car #51 leads me to conclude 99.99% it is legit.

[Kurt S]

Thanks all. I don't watch the Bench Racing section so I missed those postings. I know John but didn't realize he worked on the ZL1's.
It will be interesting asking him some of the assembly questions we have.

Kurt

[GMH454]

COPO, when Porterfield gave me the racing sheets he told me to look at the engine very carefully. When I looked in the lifter valley I was very surprised to find a set of stampimgs. Get out the flashligt and find someone with REALLY good eyesight. Mine were stamped on what look like bosses in the valley. In between watching the Olympics here I WILL dig out the remainder of the numbrers. Also check to see if your block is stamped with the 356 anywhere else other than the caps.