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Paul
The short vs long style exhaust/tail pipe on 66 SS Chevelles had nothing to do with the engine size.. L-34, L35, L-78.. but did have to do with time the car was built.. The LONG VERSION had the tail pipes exiting at the Left and Rear Bumper Corners. This was the standard on 66 SS until FEB. 1, 1966 when a shorter version was authorized. This shorter version had the Tailpipes exiting behind the rear tires below the quarter panels.. and this short version was maintained and continued into the 67 Model year where all 67 Chevelles had their tail pipes exiting. (The tail pipes also had a very unique cut at the end, I like to call it a Fancy Cucumber cut) This is not to say one could not find a late 66 with Long style pipes.. as several examples have been documented beyond February 1966, but likely that was just plants using up their supplies. My DEC. 1965 66 SS has the long style. No resonators on any 66/67 SS Chevelle exhaust systems, no matter what the hp rating.
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Mike Crown
Again........the knowledge base available on this site is beyond belief..
Ken
