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

A Recap Of Danger Mouse Tests

By Mike Petralia

Test 7: A COMP Cams XE256H cam (256/268 adv duration, 212/218 duration @ .050, .447/.454 valve lift, 110 lobe separation) was swapped in, 2 degrees advanced, and we were rewarded with lots of grunt (compare Tests 6 & 7).
Max 413 tq, 357 hp
Avg 396 tq, 293 hp

Test 8: This was our very first weird test. We witnessed that the 3/8-inch screw-in studs in the heads were flexing as we lashed the valves, so we hypothesized that it might kill some lift and duration. In an attempt to prove our hypothesis correct, we installed a COMP Cams stud girdle. Power and torque fell off at most rpm, so the stud girdle was later removed.
Max 413 tq, 356 hp
Avg 395 tq, 292 hp



  1 3/4 Full roller COMP Stud
  Headers 1.5 rockers XE256H girdle
  Test 5 Test 6 Test 7 Test 8
RPM TQ HP TQ HP TQ HP TQ HP
2600 377 187 380 188 387 191 384 190
2800 381 203 382 204 394 210 386 206
3000 390 222 391 223 401 229 398 227
3200 396 241 401 244 411 250 408 249
3400 400 260 403 261 413 267 410 265
3600 403 276 405 277 413 283 411 281
3800 407 294 406 294 413 298 413 299
4000 405 308 407 310 412 314 410 312
4200 401 321 402 322 406 325 407 325
4400 395 331 367 332 402 337 402 337
4600 387 339 388 340 394 345 394 345
4800 380 347 380 347 385 352 385 352
5000 368 350 368 350 375 357 373 355
5200 354 350 353 349 358 354 358 355
5400 N/A N/A 339 349 348 357 345 355
5600 N/A N/A N/A N/A 334 356 331 353
Max 407 351 407 351 413 357 413 356
Avg 388 287 389 288 396 293 395 292

Note how DM's powerband slowly increases as we keep trying different parts.

Tests 9-12: Bigger carb, "Air Gap" manifold, new carb spacer, bigger XE262H cam (December 2002).

Test 8 ended the day with a maximum 356 hp and 413 lb-ft of torque, and average figures were 292 hp and 395 lb-ft. This month we tried a new Speed Demon carb and an Edelbrock Performer RPM "Air Gap" manifold with a Wilson 1 1/4-inch open spacer. We also installed the next-size-larger COMP Cams Xtreme Energy camshaft. The final reward was a new max 386 hp and 438 lb-ft of torque, and the new averages were 316 hp/416 tq. Now we've got this stock iron-headed 355-cid Mouse making almost 390 hp and 440 lb-ft of torque! So far this looks like the best power formula with the stock heads, particularly since the motor didn't respond that well to the bigger cam. That means that we just about maxed out the stock cylinder head's flow potential and would either have to go in and start porting or install a new set of performance cylinder heads for more power.

Test 9: Installed Speed Demon 750 carb with 82/88 jets.
Max 418 tq, 356 hp
Avg 398 tq, 294 hp

By Mike Petralia
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