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Chevy Small Block Part 28 - Jackpot!

PT. 28-It's The Best Combination Yet

By Mike Petralia

Until now, Danger Mouse (DM) has been making some good power. But on the dyno recently, DM made some GREAT power numbers! So good, in fact, that we think this combination of torque, horsepower, and the drivability it would produce, is the best combo we've ever tested. Sure there've been tests with more power, but none of them were as affordable as this. And the coolest thing about all of this power is that if you've already got a flat-top piston 350, you could duplicate it. This really is what Danger Mouse is all about. We work to find the best combinations and then share the info with you so you can have it all. It just doesn't get any better than this.

In this month's story, Pt. 28 - Test 45, we bolted on Edelbrock's new E-Tec 170cc heads and a Performer RPM Air Gap intake manifold to see how they'd compare to last month's test with the E-Tec 200s and Super Victor manifold. The results were way better than we expected, especially in the horsepower department. Not only did the E-Tec 170s, with their smaller runner volumes increase torque by over 40 ft-lb at 4,000 rpm, but power also increased by as much as 34 hp at 4,400 rpm! And peak power never dropped way over 5 percent. That might not seem like a big number, but to put it in perspective, that's an average increase of 22 ft-lb of torque and 18 hp from 2,500 to 6,500 rpm! And all this is compared to last month's combination that was no slouch indeed. In fact, the 485 peak hp DM made last month in Pt. 27 meant that it'd kick some serious booty on the blvd. Now this new combination in Pt 28 would kick even more serious booty!

Why'd It Do It?
We're really glad that for this month's test we DID NOT change the cam or carburetor. The only parts changed were the heads and intake. We did try a few jetting and ignition timing adjustments on the dyno, just to see if things could be improved. And it turned out that this month's parts were running just a hair richer, so we removed two jet sizes from the primary side of the Mighty Demon carb and found just a bit more power. The increase in overall power and torque can mostly be attributed to the smaller runners and valves in the E-Tec 170 heads. We keep saying this over and over, and we think it's beginning to sink in; the right combination of parts will make your ride scream.

And this little, 355-cid small-block with its hydraulic roller camshaft and pump-gas friendly 10:1 compression doesn't need a big 200cc cylinder head. It's that simple. The smaller runners and valves in the E-Tec 170s we tried this month kept velocities high and that meant more flow where the engine needed it most. It's was a happy accident that the Edelbrock HR cam (234/238 at .050, 296/300 adv, .574/.584 lift with COMP 1.6:1 rockers, 112 lobe separation), worked so well with this combination, and to be completely honest, before the test began, we'd questioned whether or not the cam would be too big. The results proved our doubts were unfounded.

Once again we've spelled it out for you in black and white. You'd be hard-pressed to create a better combination for the money, and if you find one, please let us know because we're dying to try it out!

Dyno Testing Part 28
Danger Mouse specs for Part 27 - Test 44
Last Test From Previous Month
355 cid, 10.0:1 cr, 4.030-bore 4-bolt Motown block, 3.48-stroke Lunati crank, 5.7-inch Lunati rods, Lunati flat-top forged pistons, Speed-Pro moly rings, Edelbrock E-Tec 200 heads (64cc chambers, 200cc runners, 2.02" intake valves, 1.60" exhaust valves), Edelbrock Super Victor Vortec intake manifold, Edelbrock Performer RPM hydraulic roller camshaft installed at 105-degree intake CL (234/238 @ .050, 296/300 adv, .574/.584 lift w/ COMP 1.6:1 rockers, 112 LS), 36 degrees total advance, 91-octane. Tested on Speed-O-Motive's DTS dyno.

Danger Mouse specs for Part 28 - Test 45355 cid, 10.0:1 cr, 4.030-bore 4-bolt Motown block, 3.48-stroke Lunati crank, 5.7-inch Lunati rods, Lunati flat-top forged pistons, Speed-Pro moly rings, Edelbrock E-Tec 170 heads (64cc chambers, 170cc intake ports, 70cc exhaust ports, 1.94" intake valves, 1.55" exhaust valves), Edelbrock Performer RPM Air Gap intake manifold, Edelbrock Performer RPM hydraulic roller camshaft installed at 105-degree intake CL (234/238 @ .050, 296/300 adv, .574/.584 lift w/ COMP 1.6:1 rockers, 112 LS), 36 degrees total advance, 91-octane. Tested on Speed-O-Motive's DTS dyno.

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
Or e-mail: terry.cole@primedia.com

DANGER MOUSE COMPONENTS FOR PART 28
CAM EDELBROCK HYDRAULIC ROLLER (PN 2201)
CARB MIGHTY DEMON 650 (PN 5282010 GC)
GASKETS MR. GASKET
HEADS EDELBROCK E-TEC 170 (PN 60979)
IGNITION PERTRONIX DISTRIBUTOR, "SECOND STRIKE" IGNITION BOX
LIFTERS CRANE HYDRAULIC ROLLER (PN 119681)
MANIFOLD EDELBROCK PERF RPM AIR GAP (PN 7516)
PISTONS LUNATI FLAT-TOP FORGINGS
ROCKERS COMP CAMS 1.6:1 PRO MAGNUM (PN 1302-16)
  Test 44 Test 45 Diff T44-T45
RPM TQ HP TQ HP TQ HP
2600 351 174 346 171 -5 -2
2800 370 197 386 206 +16 +9
3000 377 215 403 231 +26 +15
3200 380 232 409 249 +29 +18
3400 383 248 412 266 +29 +19
3600 392 269 422 290 +30 +21
3800 400 289 434 314 +34 +25
4000 403 307 444 338 +41* +31
4200 407 325 446 357 +40 +32
4400 413 346 453 379 +40 +34*
4600 423 371 456 399 +33 +29
4800 432 395 457 417 +25 +23
5000 436* 415 458* 436 +22 +21
5200 435 431 454 450 +19 +19
5400 432 444 449 461 +17 +17
5600 427 455 444 474 +17 +18
5800 421 465 436 481 +15 +17
6000 415 474 425 485 +10 +11
6200 409 483 411 485 +2 +2
6400 398 485* 398 485 0 0
Max* 436 485 458 486 +41 +34
Avg 405 351 427 369 +22 +18
SOURCES
Automotive Racing Products (ARP)
531 Spectrum Circle
Oxnard
CA  93030
805-278-7223
Moroso Performance Products
203-453-6571
moroso.com
Bill Mitchell Hardcore Racing Products
51 Trade Zone Ct
Source for World Products
Ronkonkoma
NY  11779
Pertronix
440 E. Arrow Hwy.
San Dimas
CA  91773
800-827-3758
www.pertronix.com
COMP Cams Royal Purple
Demon Carburetion
Dahlonega
Ge
7-06/-864-8544
barrygrant.com
Speed-O-Motive
131 W. Lang Ave.
West Covina
CA  91790
6-26/-869-0270
speedomotive.com
Edelbrock
Dept. 5.0
2700 California St.
Torrance
CA  90503
310-781-2222
www.edelbrock.com
Speed-Pro
Part of the Sealed Power Corporation
100 Terrace Plaza
Muskegon, MI 49443
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By Mike Petralia
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