The Valve covers with unequal length recess slots on the top rail are 1973 and later the unequal "longer slot is for accommodation of the EGR provision on the intake manifolds.
The date inside the cover says 86.
The early L46 Z28 had no drippers and equal recess slots on the top rail -even my Nov 1969 assembled L46 corvette had no dripper covers. -
the 70 Z28 LT1 and Deuce covers had twist in cap equal length recess slots and drippers
71-72 had equal slots, smooth round hole for PUSH IN Rubber oil fill, and drippers
73 and UP L82 Z28 has unequal slots twist in cap and drippers.
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~JAG~
NCRS#65120
68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
#21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built.
71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
NUMEROUS Lemans blue Camaros,
Monza Red and Daytona Yellow Corvettes
& a Chevelle or two...
Survivors, restored cars, & other photos
https://picasaweb.google.com/lh/myphotos
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