I have made up a C4 Governor Assembly with a secondary counterweight modified to replicate the impossible to find original HiPo C4 part. This is a used assembly, with the counterweight machined to match the appearance and weight of an original HiPo unit. This part will make your C4 shift automatically at Wide-Open-Throttle closer to 6,000 rpm (a stock, non-HiPo C4 shifts closer to 5,000 rpm at WOT).
$110 including shipping within the USA.
I only have two left (it's a delicate machining operation - we've destroyed more than we've saved) <img src=images/icon_smile_sad.gif border=0 align=middle>
Jeff Burgy
cobrajeff at att . net