Chevy Small Block Part 22 - Holley - Super Chevy Magazine

An Accel GEN VII EFI system went on next, along with new heads, cam, and other related components to prepare DM for its ultimate challenge; making 700 blown horsepower on pump gas!

An Accel GEN VII EFI system went on next, along with new heads, cam, and other related com

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.

We plumbed up an ATI/Procharger D-1SC supercharger and strapped the Mouse onto Vrbancic brother's DTS dyno for a day's flogging. The end of the day left us agonizingly close to 700 hp, (we made 697 hp) and with a slight problem.The Fel-Pro head gaskets we'd installed for the blower test were not up to the boost levels we made (almost 15 psi) and began to push out of the block. Amazingly, this happened right at the end when we changed blower pulleys one final time. The engine did not break on the dyno and we didn't find this problem until we tore it apart.

We plumbed up an ATI/Procharger D-1SC supercharger and strapped the Mouse onto Vrbancic br

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.