I have a 1969 Z/28 with a build date of April, 3rd week, 1969.
I have a 4053 dated 924 (8 weeks previous) and 941 (2 weeks previous).
Is the 941 the perfect date for an April, 3rd week, 1969 Z/28? I have read that 3 - 6 weeks is the best. Is 2 weeks previous (941) too early?
Please look at these 4519 and 5583 metering blocks (below). See how the castings are different in each picture?
Which one is correct? Why are they different if they both are stamped 4519 and 5583?