As a general rule '67 BB and SB SS used finned inserts. '68 BB SS got planter box (stacks) and SB got finned inserts. '69 BB and SB SS got planter box inserts. I believe there is evidence that year end '68 and early '69 might not follow the rule.
"At model introduction in September, 1966, the SS Camaro used a special SS hood that included chromed trim that mimicked the appearance of finned oil coolers. At this time the only SS was the SS-350 model, and the badges on the car read "SS-350". When the SS-396 was introduced in January 1967, the badges were changed for all SS models to read "SS". The SS-396 could be distinguished from the SS-350 by the engine emblems. In addition, there is a blacked-out tailpan on SS-396 cars (except black-painted cars and special models like the 1969 Pace cars). Both 350 and 396 models in 1967 used the finned hood emblem for the entire model year.
For the 1968 model year, the chromed hood trim for SS396 changed from the simulated finned cooler to a set of simulated carburetor velocity stacks. The early 1968 model year SS350 continued to receive the 1967-style finned hood trim, but the SS350 trim transitioned to the velocity stack trim as the year progressed. The simulated velocity stack continued for the 1969 model year with all SS cars using this same hood trim. Related to this, the part number for the 1968-69 hood is different than 1967, with the only noticable difference being the drains used with the velocity stack trim."
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