Kevin, The document shown in the Chevy Action article is the best evidence I have seen to date of a COPO 427 1968 Camaro maybe two. I scanned and magnified it to 8x11 size trying to read it. Some of it is legible but some of it is too grainy. I sent a copy of it to Jim Mattison and he replied that he hadnÃt seen one for many years but remembered it as the œGSD-578” form. The copy shown on the Speedvision Musclecar COPO TV show looked like the one I emailed to Jim. I did tell him that there seemed to be some good evidence that not all the 68 Yenkos were MV code 427 engines but on the TV show Jim seemed to indicate that he still believed they all had the 427. I am not convinced that they all had the 427.
The GSD-578 form shows a COPO 9737HD. The "HD" is the ECL (Exception Control Letters) code to show a configuration change in a RPO or COPO number. Such as on the Yenko Chevelle build sheets that show 9737LD and 9737KD. Chevy could have used a different ECL suffix code on the 9737 to build different configurations of the 1968 COPO Camaro. From what I can read on this COPO order form it is dated 2-13-68 requested by Yenko Chevrolet and Span inc. for two 9737HD sports car conversions to ship ASAP. ( It appears to show quanty as 2 but not clear). One line of the document listed the RPO's that appear to have been deleted and replaced by other components. They are as follows; Z23, L78, M21, AXL2 (crossed out), J52, J50, U63, G80, N40. I decode this as; Z23 = special interior package (looks like it is not on this car), L78 = 396 (the article claims the original motor is a 427 with L88 parts), M21 (they claim the car has a M22, AXL2 = special performance axle (this is crossed out on the form) J50/J52=power disk brakes (the car looks like it does not have power brakes but may have J56), U63=AM radio (the car has no radio) G80= Posi rear (the crossed out AXL2 could spec. the axle 4:56) N40=power steering (the car looks like it has no PS). I can email a copy of what I have but I hope you can find the original.
On the Yenko colors “ I am not sure about the red interiors but Don Y definitely liked his racecars to be white with blue stripes down the center. He used this paint scheme on his early Corvette race cars and on the first Stinger Corvairs.
