Thread: thumper or not????????

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Here's the cam card for the thumpr....
http://www.compcams.com/Cam_Specs/Ca...?csid=107&sb=0

And here's the one for the mutha thumpr....
http://www.compcams.com/Cam_Specs/Ca...?csid=108&sb=0

These will tell you everything you need to know to run either of these cams.

I thought it might help some of you to run a DynoSim with the thumpr cam and a few different sets of heads. The motor is a 355 Chevy, 10.3:1 static compression ratio, 1 5/8" long-tube, equal-length headers, RPM intake, 750 carb. The first number is hp, the second is torque. Heads are listed best to worst on this particular motor. *means aluminum. The cam is a 12-600-4 CompCams Thumpr, .479"/.465", timing figures @ 0.050" are 11.5/35.5/52.5/8.5, 102/112/107, cam installed straight up.

1* Patriot 225, 547/6500, 504/5000 (Please, no groaning from you Illinois guys about this. The dyno just really likes this head, so get over it)

2* Airflow Research 180, 474/6000, 470/4500

3* Edelbrock RPM 170, 453/6000, 463/4500

4 Dart Iron Eagle 180, 450/6000, 461/4500

5* Canfield, 448/6000, 458/4500

6* Patriot 195, 438/5500, 453/4500

7 World Sportsman II, 434/5500, 453/4500

8* Holley Systemax, 433/5500, 454/4500

9 GM L31 Vortec 1.94/1.50, 426/5500, 446/4000

10* Brodix -8 Pro, 424/5500, 450/4000

11 GM 462 casting 1.94/1.50, 389/5000, 437/4000