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Chevelle SS396 Dyno Test - Calling Dr. Dyno!

1969 Chevy Chevelle SS Dyno Test
1969 Chevy Chevelle SS Dyno Tuning
The 750 was square all around... 
   
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1969 Chevy Chevelle SS Dyno Tuning
The 750 was square all around with 73 jets, but we needed to lean it out a bundle. We dropped the primary jets down to 71s, and the secondaries to 68s. That's a two-step and a five-step downgrade front and back. The result was a better air/fuel ratio, but the same power.
1969 Chevy Chevelle SS Street Avenger Carb
Last but not least, we laid... 
   
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1969 Chevy Chevelle SS Street Avenger Carb
Last but not least, we laid down the 670 cfm Street Avenger carb atop the 396. Even though the air/fuel gauge showed a slightly lean condition, it didn't warrant us to lift our foot off the throttle, and the Chevelle cranked out 195 horsepower and 281 lb-ft of torque. We tried playing with the mixture screws to lower the air/fuel, but to no avail. Alas, we were going to have to change jets.
1969 Chevy Chevelle SS Dyno Tuning
Not wanting to mess with the... 
   
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1969 Chevy Chevelle SS Dyno Tuning
Not wanting to mess with the great tip-in the 670 gave us, we only adjusted the primary side of the fuel mixer. The primary jets were 65s, while the secondaries were 68s, showing that the primary circuit was a bit leaner. With that in mind, we went up four jet sizes to 69s, and then slammed the loud pedal down one last time. The result was 199 horsepower and 287 lb-ft of torque.
1969 Chevy Chevelle SS Dyno Graph 1969 Chevy Chevelle SS Dyno Graph 1969 Chevy Chevelle SS Dyno Graph
Holley Performance Products, Inc.
1801 Russellville Road
P.O. Box 10360
Bowling Green
KY  42102-7360
(270) 782-2900

www.holley.com/
Tune Time Performance
931 RT 166
Toms River
NJ  08755
732/349-7800

www.tunetimeperformance.com

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