Unless you lived near a Chevrolet performance dealer like Yenko, Berger, Gibb, Rosenthal, Indianatlantic or Rathmann, the chance of finding anL78 on the showroom floor was somewhere between slim and none. You had to know how to get your mitts on a Special Product Order form and fill out the right information, then get the dealer to order it for you. You gave him your deposit and then you waited six to eight weeks for the hauler to arrive with your L78 Chevelle.
What was the L78? It was 375 hp wrapped up inside a 396-cid engine. There was only one other option that made the L78 look mundane, and that was the L89, which parked a set of aluminum cylinder heads atop the iron-block 396, but retained the same 375hp rating. The L78 was an expensive option ($252.80), but the L89 was even more ($647.75). As enigmatic as the L78 was in the showroom, thanks to magazine coverage, 9,486 L78 Chevelles were ordered in 1969. The RPO Z25 Super Sport package was now an option (RPO Z25) on any Chevelle V-8 hardtop or convertible. Along with specific emblems on the grille, front fenders and the blacked out taillamp panel, the SS package also featured a domed hood and power front disc brakes. Sales of the 1969 SS option were strong, with 86,307 rolling out of dealers' doors.