Big-Block 1969 Chevrolet Corvette Dyno Test - Corvette Big-Block Party, Part 4

Part 4: Wrap-up, dyno testing, and driving impressions

Paul Sisia Oct 10, 2011 0 Comment(s)
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Dyno Chart

RPM Power Torque
2,000 178 463
2,250 195 453
2,500 222 458
2,750 255 483
3,000 295 513
3,250 326 526
3,500 352 527
3,750 378 527
4,000 417 546
4,250 457 565
4,500 487 568
4,750 518 572
5,000 542 569
5,250 550 550
5,500 569 543
5,750 585 534
6,000 600 520

Peak numbers in bold

Driver’s Log

Vemp 1111 13 O Big Block 1969 Chevrolet Corvette Dyno Test 69 2/15

“Powerful, responsive, torquey…whichever adjective you prefer, the right pedal delivers the ability to smoke the tires and inhale large stretches of real estate with ease.

“This FAST fuel injection provides the kind of metering a carburetor can only dream about. Hot, cold…it makes no difference. Perfect starts, consistent and smooth idle, and seamless power that appears to be endless.

“No hiccups, sputtering, or ‘loading up’ like with the original 3x2 carb setup.”

Steering response, ride quality, and handling:

“Steering response is immediate. Just think about changing lanes and you’re there. Turn-in is precise, with good feedback through the wheel. The Borgeson steering box also delivers a quicker ratio lock-to-lock, so less input is required.

“These urethane bushings provide a more direct connection to the pavement. The car feels like it’s really screwed together.

“The heavy-duty sway bars, gas shocks, and a set of modern Firestone radials produce one great handling package…much improved over the original setup.

“There’s minimal body roll, if any, and the front tires stick nicely in the turns. Just don’t feed in too much throttle: It’ll break the rear tires loose if you’re not judicious.


“The Gearstar 4L60E is one of the most startling improvements. The old 700R4 took all the fun out of this Vette. It shifted from First to Second in about 10 feet and was in Fourth gear by the time you hit 20 mph. The 4L60E gives us infinite adjustability on the shift points and firmness. And you can easily do it all with the handheld programmer.

“There’s no hunting for the right gear. Drive easy, and the motor seems to always be hitting a sweet note. Want to ‘giddyup’? A slight press of the accelerator will drop you down a gear for instant response.

“Nice drop in rpm on the highway. We hit 70 mph at just 2,300 on the tachometer.”

Fuel mileage:

“Miraculous! A 600-plus-hp big-block that delivers 21 mpg on the highway and a 50 percent increase in fuel mileage over the old 406 small-block.

“Fuel economy in town? Who cares? Stoplight-to-stoplight driving gives us a chance to enjoy the rush and avoid the high-speed traffic tickets.”


Gearstar Performance Transmissions
Akron, 44308
Air Flow Research
Valencia, CA 91355
Summit Racing
Akron, OH
EBC Brakes
Sylmar, CA 91342
Borgeson Universal
Torrington, CT 06790
Denny's Driveshaft
Kenmore, NY 14217
Lamar Walden Automotive
Doraville, GA 30340
Memphis, TN 38118
Volunteer Vette
Knoxville, TN 37914
Jim Ellis Chevrolet and Corvette Center
Atlanta, GA 30341
F&B Throttle Bodies
Miller's Powder Coating
Lilburn, GA 30047
Precision Corvette Differentials
Van Steel
Clearwater, FL 33762


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