1968-1970 Chevrolet Corvettes - Remember When...

Thoughts From The Automotive Past

Doug Marion Mar 2, 2010 0 Comment(s)
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When 1968 tic-toc'd in, Corvette owners world-wide had already enjoyed five glorious, fun years with C2 Sting Rays-some 117,964 RPO cars in all (model year 1963 through 1967). Long about 1965, Chevrolet displayed (mostly via photos) a futuristic pointy-nose Corvette prototype. Everyone then pretty much assumed this was what the C3 body styling would resemble. Not everyone liked the look. But others were ready for a change. The top C2/Sting Ray sales totals were for the '66 model year with 27,720 (9,958 coupes and 17,762 roadsters).

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So how do you think the all-new '68 Corvette sold? In all, it blew right by those '66 record sales numbers with a total of 28,566 (9,936 coupes and 18,630 roadsters). Not only was the Mako Shark-look well received, '68 big-block engine sales increased by 2,920 over 1967 (12,627 to 9,707). Ironically, all of this increase came from 7,717 390hp 427 sales-compared to 3,832 in 1967. There were also 5,063 M40 Corvette Turbo 400 automatic transmissions ordered in 1968. Most were ordered with the 390hp 427. A new Corvette trend indeed emerged in 1968-a beefy three-speed automatic transmission with a smooth-idle, torquey 427. Combined with the '68's all-new look and upscale interior, it was a dazzler. I decided in 1968 to get my butt in gear and get my BA degree in college. My free time in 1968-'69 was spent studying, but my weekends were usually spent earning money by super-tuning Chevy engines in rural Iowa and at Cordova, Illinois, and Kahoka, Missouri, dragstrips.

To many, the 390hp 427 was just an overgrown 325hp passenger car 396. I have always considered both of them in factory-stock form to be somewhat lackluster performers due mainly to lean carb jetting and a slow ignition advance curve. But with a camshaft update, a super-tune, and some Q-jet carb jetting, these engines came alive! Just check the NHRA, AHRA, and IHRA Stock class record-holder and championship event winner lists from the era. Also check what oval port big-block engines did in the Camaros, Chevelles, and Novas. (They outran everything in their classes.)

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Generally speaking, only minor exterior body chrome separated the '69 Corvette from the '68. The thing many liked the most was that the '69 had electrically-operated pop-up headlight assemblies. The '68s were vacuum-operated and used to pop open at will, often one at a time. We never did figure out the problem on our silver '68.

Overall, 1969 was a very solid Corvette year, race wins and otherwise. Would you believe that sales climbed to another all-time high? Try 38,762 (22,129 coupes and 16,663 roadsters). The total number of big-block Corvettes sold were 15,343- almost 40 percent of the total! Small-block L48, 350hp 350 sales were 12,846 (33 percent.) The base 300hp 350 engine total was 10,575 (27 percent). A lot of different buyers showed they had a lot of different driving interests. This actually is good. Credit a lot of Corvette-loving Vietnam armed forces veterans whose tours of duty ended in 1968 and 1969. Surviving that Southeast Asia fracas was cause to celebrate-and many did upon return, with a new Corvette or performance Chevrolet.

The '69 Corvette's high-water performance mark centered on the 116 L88, 550hp, 427 race editions and the 2,722 solid lifter, 435hp 427 high-performance street engines. The L88 race package retailed for a whopping $1,032.15 extra. Two RPO ZL1 427s turned up years later-referenced as RPO-built and legally sold.

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For the record, Corvette engineers had two ZL1 "mules" (prototypes). One was white with an M22 four-speed and 3.70:1 gearing. The other was red with a TH400 transmission and 4.88:1s with drag slicks. Corvette Chief Engineer Zora Arkus-Duntov told me back in the mid-'80s that he ran 10.70s at 133-plus mph in the red mule at Milford. On Press Day back then, major magazine, tabloid, and newspaper editors and writers were said to have had best runs in the 10.90s at 132 mph. The white ZL1 street version ran in the low 12s at 116 mph.




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