Chevrolet Muscle Car Dyno Wars

We Wanted To See What Yesterday's Classics Make On A State-Of-The-Art Chassis Dyno

Patrick Hill Feb 1, 2011 0 Comment(s)
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1969 L72 Yenko Camaro
Denying the popularity and iconic status of the '69 Camaro in the Chevy world is like trying to deny the sun comes up every day. It's the car that, short of the '57 Chevy, is the most well-known profile of the Bow Tie line. Inside the '69 Camaro realm, there is a mystique that surrounds the famous COPO cars, and more specifically, the famed Yenko "super Camaros" that rolled out of Don Yenko's Cannonsburg, Pennsylvania, dealership.

Sucp_1102_10_o Chevrolet_muscle_car_dyno_wars 1969_l72_yenko_camaro 2/12

This particular Yenko has an even more unusual status-it was the first '69 Yenko Camaro ever built. Owned by John Miller, this Camaro was built early in the fall of 1968, and sent from Detroit by Vince Piggins to Yenko for use in mocking up all the special items being designed for the '69 Yenkos. Watch for a dedicated feature on this historic Chevy in a future issue.

Sucp_1102_12_o Chevrolet_muscle_car_dyno_wars L72_big_block 3/12

Powering the COPO Camaros that were the foundation of Yenko's cars was the L72 big-block. The 427 debuted in the 1966 model year, and would be top dog until the LS6's arrival. With 425 horsepower in iron block, single carb form, these engines were terrors on the dragstrips, still dominating various NHRA Stocker classes to this day. It used the same solid lifter/dual valvespring combo of the L78, high flowing rectangular port heads, forged rods and 11:1 compression forged pistons.

Since this was the last car we tested (at a shop in North Carolina), we were curious to see how the L72 compared to the vaunted LS6. Both cars had 4.10 gears, which will show less horsepower than, say, 3.23s or 3.08s. But the F-body had the benefit of a manual transmission. Ultimately, it rolled the Dynojet to 2.5 more horsepower than the LS6, and slightly more torque at the peak.

Sucp_1102_11_o Chevrolet_muscle_car_dyno_wars Camaro_dyno 4/12

On the Dyno
RPM HP TQ
2,500 137.52 288.91
2,600 146.29 295.50
2,700 154.88 301.27
2,800 161.65 303.21
2,900 168.40 304.99
3,000 175.78 307.73
3,100 183.77 311.35
3,200 191.76 314.72
3,300 199.39 317.34
3,400 206.32 318.71
3,500 213.06 319.71
3,600 218.85 319.29
3,700 224.24 318.31
3,800 229.72 317.50
3,900 233.21 314.07
4,000 238.05 312.57
4,100 242.47 310.61
4,200 246.36 308.08
4,300 250.03 305.39
4,400 255.88 305.43
4,500 260.57 304.12
4,600 265.15 302.74
4,700 269.77 301.46
4,800 275.33 301.26
4,900 277.63 297.58
5,000 281.16 295.33
5,100 283.12 291.57
5,200 286.38 289.25
5,300 287.56 284.96
5,400 283.39 275.63
5,500 283.79 271.00
5,600 285.26 267.54
5,700 285.47 263.04
5,800 281.12 254.57
5,900 285.29 253.96

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