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1996 Corvette Trivia

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The ZR-1 Corvette was dropped for the 1996 model year with the Grand Sport option sort of taking it's place.

The LT4 engine was part of the Grand Sport package and was a $1,450 option on any other 1996 Corvette. The LT4 was only available with the 6-speed manual transmission.

The intake manifold was modified to better match the improved head ports. Although the manifold was ported to match, there was enough extra material for safe porting. Fuel injectors were enlarged from 3.0 grams per second to 3.5 grams per second. The revised manifold was then powder coated red to differentiate the LT4 from the LT1.

Big improvements were made inside the heads. The intake and exhaust ports have larger radius bends for smoother flow and less back pressure. Each intake port volume was increased 25cc to 195cc and the combustion chamber roof was slightly lowered and the walls were moved back, unshrouding the valves. With the valve covers off, the top of the heads looks like a racing engine with modified Crane roller rockers replacing the LT1 stamped steel rockers. Valve springs are oval section and have higher closing force. Deeper inside the heads, the intake valve was increased from 1.94 to 2.0-inches and the exhaust increased from 1.50 to 1.55-inches. Arguably, the only thing missing from the LT4 package was a set of steel tube headers.

Each improvement by itself might not seem like much, but the combination netted out 30 extra horsepower. While the torque rating is the same as the LT1, the engine’s redline was up 800 to 5,800 rpm. It’s also worth noting that the LT4’s horsepower rating is “net” 330-HP, putting the gross somewhere in the low 400 range, making the LT4 nearly as stout as an old 427 big-block.

Total production of the ZR1 from 1990 thru 1995 was 6,939 units.
A drip tube was designed into the A-pillar weatherstrip for improved water intrusion control.
On the interior of all 1995 Corvettes, numerous Velcro straps were installed to reduce rattles, and a stronger radio mount was installed to reduce CD skipping.
Base suspension models had lower front and rear spring rates.
Windshield wiper arms had revised contact angles and higher contact force to reduce chatter at all speeds, and lift at high speeds.
Clutch controls in the four-speed automatic transmission were improved for smoother shifting, and its torque converter was both lighter and stronger.
Non USA sales for 1995 included 554 units to Canada, 11 units to Mexico, and 251 global exports.

Typical 1996 window sticker w/LT4 engine option example

Grand Sport Convertible window sticker example

Typical 1996 build sheet example

Grand Sport 1996 build sheet - note Z16 option - example

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