XV conservatively rates the base engine package at 360 hp with the stock cam, but also offers upgraded packages, including more cam and the matching valvesprings, for ratings of 400 and 420 hp. The more powerful of these two packages, the XV Stage III, would be the subject of our next test. Featuring a COMP Cams camshaft with a rated advertised duration of 273/277 degrees, and measuring 224/228-degrees dura- tion at .050-inch tappet rise with .547/.550-inch lift, this is not a "wild" cam. Although considerably healthier than stock, the XV Stage III cam is moderate by conventional performance standards, especially in terms of duration. There was, however, the definite sound of performance, which was conspicuously absent with the OEM cam. To go along with the cam upgrade, the package also includes a set of uprated "beehive" valvesprings from COMP designed for the more aggressive valve action of the hotter stick. The ignition, carb, and intake setup remained the same, although the carb and spark calibration were changed to that offered for the Stage III package.

So what are a mild performance cam and the corresponding calibration worth in an otherwise all-stock 5.7 Hemi? As with the previous setup, the tuning was already done via the XV calibration, so all we needed to do was run for the numbers. Stout numbers they were, with peak horsepower now surging to 438 hp at 6,700 rpm, and peak torque recorded at 390 lb-ft at 5,200 rpm. The cam and spring change alone were worth a gain of 67 peak horsepower, and extended the useable rpm range by 900 rpm. We were impressed. Equally impressive was the fact that the added power did not come at the expense of torque, with peak torque increasing by a substantial 24 lb-ft. In fact, other than a slight loss in torque below 3,200 rpm, the larger camshaft got up and ran away from the output posted by the OEM cam combination. Unless you are building for a tow truck, there is little reason not to recommend the upgraded cam combination.

Swapping in Hemi power has never been easier with the components from XV, and one could argue that making Mopar power has never been cheaper or simpler. After all, we had a basically stock engine with a carb, intake, spring, and cam combo making a very streetable 438 hp. With the small-block of old, getting there would require head work, nasty levels of cam, or a combination of both. The new Hemi has unbelievable potential to offer for the streetbound Mopar. Unlocking that potential in a classic Mopar is as simple as turning the key with these parts from XV Motorsports. And the best part is that at the end of the day, you've got a Hemi to boot!

Finding A Hemi Core
Don't have a new Hemi lying around? All you need is a basic long-block like this one-you don't even need the computer, wiring harness, or even the fuel-injection manifold, for that matter. Even though they've only been produced since 2003, more than a million 5.7L Hemis have been turned out, so they're becoming more plentiful with each passing month. We had no problem finding them for sale on eBay and at core suppliers like Street & Performance (479-394-5711) for around $2,500.

COMP XFI273 CAM SPECS:
Intake duration: 224 degrees at .050
Exhaust duration: 228 degrees at .050
Intake valve lift: .547 inches
Exhaust valve lift: .550 inches
Lobe separation: 114 degrees
WHERE THE MONEY WENT:
Description: Part No.: Source: Price:
XV Stage III 5.7 carb kit*** 11-3807 XV Motorsports $2,470
Intake manifold 11-2102 XV Motorsports $499 (included)
Holley 4150 650-cfm carb 0-80783C XV Motorsports/Holley $450 (included)
Wiring harness 11-3302 XV Motorsports $227 (included)
MSD 6 Hemi ignition controller 11-3301 XV Motorsports $525 (included)
COMP camshaft (XFI273) 11-1203 XV Motorsports/COMP $400 (included)
COMP beehive valvesprings 11-1204 XV Motorsports/COMP $200 (included)
Short plug wires* 11-3303 XV Motorsports $99
MDS Eliminator Kit** 11-1205 XV Motorsports $152
Used 5.7L Hemi long-block n/a Street & Performance $2,500
Total:     $5,221
* may or may not be needed depending on year of core
** required for core engines equipped with MDS
*** kit includes programming
DYNO RESULTS
SUPERFLOW 901 ENGINE DYNO
TESTED AT WESTECH
PERFORMANCE GROUP
STP CORRECTION FACTOR
TORQUE
RPM Stage Stage
  I III
2,600 343 331
2,800 347 331
3,000 350 338
3,200 350 347
3,400 351 353
3,600 350 358
3,800 351 362
4,000 349 364
4,200 356 372
4,400 360 375
4,600 362 380
4,800 366 382
5,000 363 387
5,200 360 390
5,400 352 388
5,600 344 382
5,800 336 377
6,000 324 371
6,200 312 364
6,400 296 357
6,600 197 347
HORSEPOWER
RPM Stage Stage
  I III
2,600 170 164
2,800 185 177
3,000 200 193
3,200 213 211
3,400 227 228
3,600 240 245
3,800 254 262
4,000 266 277
4,200 284 297
4,400 301 314
4,600 317 332
4,800 334 349
5,000 345 368
5,200 356 386
5,400 362 399
5,600 367 408
5,800 371 416
6,000 370 424
6,200 368 430
6,400 360 435
6,600 248 436
6,700 n/a 438
SOURCE
Street & Performance
479-394-5711
www.hotrodlane.cc
Holley Performance Products
1801 Russellville Rd.
Bowling Green, KY 42101
KY  42101
270-782-2900
www.holley.com
XV Motorsports MSD Ignition
El Paso
TX
9-15/-857-5200
msdignition.com
COMP Cams