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Chevy Small Block Part 11 - Pt. 11: Tuner's Delight

F.A.S.T. EFI And A Comp Cams Hydraulic Roller Turn 8.5:1 Compression Into 480+HP

By Mike Petralia

Over 75 pulls later, we made the most power using the least amount of fuel (low BSFC number) ever. Sometimes a low BSFC just means you're running on the ragged edge of lean, but we checked the spark plugs very carefully and the dyno's knock sensor never even whispered. Some of this month's extra peak power could also be at least partially attributed to a new proprietary hydraulic roller cam from COMP Cams that we installed. Although it did give up some low-end torque compared to the other cams we've tried, 483 peak horsepower from an 8.5:1 compression, 355-cid small-block is very fierce.

8th Series Of Dyno Tests
Unless listed, no other changes were made for any test.

Danger Mouse specs for Part 11:

355 cid, 8.5:1 cr, 4.030 bore, 3.48 stroke, 5.7-inch rods

Test 21: TFS aluminum heads (Summit Racing PN TFS-30400013-CNC, 72cc chambers, 195cc runners, 2.02/1.60 valves), Edelbrock Victor EFI manifold (PN 29785), Comp Cams Xtreme Energy EFI prototype hydraulic roller camshaft (281/288 adv dur, 230/236 dur at .050, .544/.555 lift w/1.6 rockers, 113 LS) straight up. Comp Cams 1.6:1 Pro Magnum roller rockers, Speed Demon 750 carb, 36 degrees total advance.

Test 22: Installed F.A.S.T. EFI system with Accufab throttle body and 30-lb/hr injectors at 50 psi

Test 23: Switched to 36-lb/hr injectors at 50 psi.

  Test 21 Test 22 Test 23
RPM TQ HP TQ HP TQ HP
2600 352 174 364 180 355 176
2800 350 187 362 193 352 188
3000 357 204 369 211 361 206
3200 379 231 383 233 380 231
3400 389 252 387 251 383 248
3600 385 264 385 264 382 262
3800 385 278 381 276 278 274
4000 384 292 379 289 380 290
4200 387 309 388 310 390 312
4400 406 340 408 342 396 332
4600 424 372 421 369 415 363
4800 428 392 427 391 424 387
5000 429 408 426 405 423 402
5200 430* 426 426 422 419 415
5400 421 433 431* 444 420 432
5600 424 452 423 451 426 455
5800 420 464 420 464 426 470
6000 413 471 420 480* 420 480
Max 430 474 431 480 427 483
Avg 397 330 400 332 396 329
* = peak

We're always looking for new ideas. Do you have a better one for Danger Mouse? Send your test suggestions to:

Super Chevy Magazine
Attn: Danger Mouse
720 Hundley Way
Placentia, CA 92870
Email: mike.petralia@primedia.com

By Mike Petralia
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