Join Date: Jul 2003
Location: riverside california
My build sheet says =ZL3 SS 396 CONVERSN
It is 1st week October 69, the 25533 Chevelle built for the 1970 model year. There is a separate option listed for L-34, so I assume that L-78 could be a ZL3 also, but correct me if I'm wrong. F41 suspension and power disk brakes were also listed as a separate option.
I always thought that the ZL3 was for picky buyers who ordered an SS with what they wanted. Mine was at the dealer for only a few days from the build sheet after the nit-picky buyer started bringing it in for smearing wipers and wind noise around the driver door. There were a lot of problems with this car, so you'd think it was a lemon, but simple things like 3 clutches in the first 42k miles, and a noisy lifter, rebuilt rochester carb, etc. I think that in 1970 people tried to melt the engines, tires, clutches, etc. just to race the geezus out of them.
The M20 never had a problem, and it still shifts great after only one rebuild. 35 years later, only 132k miles!