Yenko turbo 400 speedo adaptor

[Ed Cunneen]

Kurt,
My information relates specifically to COPO's. The chart on my website which shows speedo adapters relating to COPO's is a reference that came directly from the COPO build orders. My interpretation of this is that all specifically referenced COPO's had this reducer. Perhaps it is because they all were ordered with the same type of transmission. I then listed the chart that came directly from Chevrolet parts for COPO's that had 4-speeds with certain tire combinations. Since these combinations were RPO's and not deviations, it was not necessary for Chevrolet to list them in the COPO build order. I have never encountered a variation from the above, but if we find exceptions, I would be happy to add them to my site.