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Small Block Chevy Parts Testing - Total Recall: Danger Mouse Part 9

A Recap Of Danger Mouse Tests

By Mike Petralia
  Vortec COMP
  heads 1.6 rockers
  Test 14 Test 15
RPM TQ HP TQ HP
2600 383 190 379 188
2800 389 208 384 204
3000 406 232 404 231
3200 422 257 427 260
3400 429 278 433 280
3600 431 295 435 298
3800 429 311 437 316
4000 426 325 432 329
4200 425 340 433 347
4400 430 361 434 364
4600 433 379 439 385
4800 430 393 433 396
5000 421 400 423 402
5200 406 402 411 407
5400 395 406 401 413
5600 384 409 389 415
5800 365 403 365 403
Max 435 409 440 416
Avg 413 330 417 333

Test 16-18: GMPP Vortec cylinder heads, Wilson four-into-one carb spacer, COMP Cams 1.6:1 rockers (March 2003).

The final dyno bash we'll review this month had us swapping cams, rockers, and carb spacers like they were going out of style. DM ended up making a maximum 427 hp and 439 lb-ft of torque. Those are fantastic numbers coming from just a 9.25:1 small-block still running a very small hydraulic camshaft (COMP's XE268H). The Vortec heads had made 23 more peak horsepower than the factory heads we tested-the camel humps (compare Tests 12 and 14).

In March '03 we tried a new Wilson carb spacer and gained some extra power at 3,000 rpm (Test 16). Then, we wrestled rocker arm ratios around and saw some torque improvement with no horsepower losses (Test 17). And we finally swapped in the next bigger COMP cam with the results we were expecting (Test 18), more horsepower upstairs and less torque downstairs.

By Test 18 we think we've reached the pinnacle of affordable small-block performance, and to make any more power we'd have to go with ported cylinder heads and/or a set of more-expensive aftermarket aluminum or maybe still some iron castings. Look for these comparisons in upcoming months. Still, if you follow our recipe, any properly blueprinted, pump gas small-block you build could easily duplicate all of our power figures, while costing only around $3,500 and being a kick to drive everyday.

Test 16: A Wilson 1-inch open carb spacer with a Wilson four-into-one tapered spacer were swapped in.
Max 440 tq, 414 hp
Avg 418 tq, 334 hp

By Mike Petralia
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