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Chevy Small Block Part 22 - PT. 22: Horsepower Is King!

The Right Combinations Are The Key

By Mike Petralia

Jumping Forward
After the baseline had been established, we began our long quest to build the most power possible using nothing but off the shelf parts. Since then, we feel we've created perfection in several categories; one of which has been EFI. Back in DM Part 11, (August 2003) we tested some of the more high-end EFI components using a F.A.S.T. multi-port system.

This time around we wanted to test a more simple conversion. So we gathered up a Holley Street Avenger Throttle Body Injection (TBI) system and bolted it on to see what it could do. The results were not outstanding. And after several days spent tuning on the dyno, we could barely get the TBI to make as much power as a Holley HP carburetor did. Those results did not surprise us, however, there were still some marked benefits from the TBI system. Including better starting, better all-climate running, and maybe even better fuel economy, but we didn't get better power, although there was a slight power gain at 2,500 rpm.

DM Part 17-Test 29:
Freshly rebuilt with World Products Sportsman II angle-plug iron heads (64cc chambers, 200cc runners, 2.02 intake valves, 1.60 exhaust valves), 10:1cr, Holley PN 300-36S dual-plane intake manifold, Holley HP750 carb, Lunati hydraulic roller camshaft (215/224 @ .050, 268/279 adv, .489 lift, 112 LS). COMP Cams 1.6:1 roller rockers, 34 degrees total advance.

DM Part 17-Test 30:
Installed Holley Street Avenger 900cfm 4bbl electronic throttle body fuel injection.

Test 29 Test 30
CARB TBI
RPM TQ HP TQ HP
2600 362 179 371 183
2800 385 205 383 204
3000 401 229 389 222
3200 410 250 395 240
3400 411 266 398 257
3600 412 282 397 272
3800 410 297 403 292
4000 415 316 405 308
4200 415 332 401 321
4400 412 345 391 328
4600 407 356 391 342
4800 402 368 392 358
5000 398 379 392 373
5200 389 385 387 383
5400 380 391 380 391
5600 374 399 375 394
5800 358 395 350 385
Max 415 399 405 394
Avg 397 316 388 309

Superpower!
Immediately following our less than exciting TBI test, we jumped overboard! A call was made to ATI/Procharger and we got our hands on one of their D-1SC centrifugal superchargers, which definitely gave us the "most power on pump gas".

For DM Part 18 T31 & T32 the blower required a few different components to make sure the engine would live and make some serious power. To that extent Speed-O-Motive dove back into DM's storage locker and pulled out the old set of Trick Flow Specialties (TFS) aluminum heads we've used several times in the past. Not only do the TFS heads make great power, their big combustion chambers also lowered DM's compression, which is exactly what was needed for the blower.

By Mike Petralia
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