When we started this project, our Chrysler made a pitiful 212 horsepower, and 288 lb-ft of torque at the rear wheels with its stock, low-compression 383 and exhaust manifolds. By installing tti headers and exhaust, a mild hydraulic Comp cam and lifters, an Edelbrock intake, and Edelbrock carburetor, we improved our 383’s output to over 245 rear-wheel horsepower and more than 315 lb-ft of torque. Testing our car after installing the Edelbrock E-Street cylinder heads, horsepower climbed to over 276.06 and torque was up by some 20 lb-ft to 335.44 lb-ft at peak. At areas below peak, we made substantial gains as well, meaning our engine will pull harder throughout the rpm range and really get our big Chrysler moving.

Any time you evaluate numbers from the chassis dyno, you need to remember that these numbers are substantially lower than power and torque at the flywheel. On the chassis dyno, the engine is turning accessories like the alternator, power steering pump, water pump, and air conditioning compressor drive, and power losses through the torque converter, transmission, differential, and full exhaust system can all be substantial. What we can tell you for sure, is that our Chrysler is much more fun to drive now and pulls harder whether accelerating from a standing start or passing someone at highway speeds. By installing the E-Street heads our mild 383 gained over 30 horsepower and 20 lb-ft of torque, showing clear improvements over the factory 906 castings. On a larger displacement, higher compression engine, we’d expect even higher gains. mm


Price tag
Part PN Cost
Edelbrock PN 5090 E-Street assembled cylinder heads $1,469.97
Edelbrock PN 8591 head bolt set $109.97
Comp Cams PN 1621-16 Pro-Magnum Rocker Arms $679.97
Autolite PN 3924 long reach spark plugs $16.72
Edelbrock signature series valve covers $51.97
Valve cover breather $14.99
Fel-Pro PN 1009 head gaskets $37.97
Fel-Pro PN 1214 intake valley pan set $20.97
Total $2,402.53


Run Date: 7/19/2013 10:29:40 AM
RPM x1000 hp ft-lbs
3,500 177.19 265.87
3,600 215.83 314.87
3,700 230.20 326.77
3,800 239.34 330.80
3,900 247.20 332.91
4,000 254.27 333.86
4,100 259.18 332.02
4,200 261.81 327.40
4,300 264.00 322.45
4,400 267.57 319.39
4,500 272.17 317.66
4,600 272.10 310.68
4,700 273.45 305.58
4,800 272.37 298.02
4,900 271.51 291.03
5,000 267.36 280.84


SOURCE
Edelbrock
2700 California St
Torrance
CA  90503
310-781-2222
http://www.edelbrock.com
Summit Racing
Akron
OH
800-230-3030
330-630-0240
http://www.summitracing.com/
Comp Cams
3406 Democrat Road
Memphis
TN  38118
800-999-0853
http://www.compcams.com