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383 Chevy Proharger - Late-Model 383 Buildup-Part 3

With A Solid Long-Block Our Lt1 Stroker Gets A Cleared Airway And A Giant Lung!

Photography by Carrie Fesler, Roy Landgrave, Terry Cole

Adding forced induction to a stout engine has long been considered the epitome of performance when attempting to unbridle the most in power and torque. From Top Fuel to Pro Street, aluminum lungs are standard equipment-both in terms of throttle response and gawk appeal. (What's cooler looking than a polished 8-71 sticking out of the hood?). But when it comes to unleashing the most from today's computer controlled EFI-equipped engines, however, roots-style blowers are not-surprisingly missing from the scene.

Have they lost their visual allure? Not likely-it's simply a matter of logistics: First, they require a complete revamp of the engine (Few, if any late-model owners want to take a plasma cutter to their new cars). And, in most instances, they will automatically render the modern machine illegal in the eyes of the ever-increasing fraternity of smog cops.

Enter the age-old second-tier huffer known as the centrifugal supercharger. These belt-driven, high-winding, impeller-spinning blowers have been around for nearly as long as their top-of-the-engine-mounted brethren. But, until the advent of computer-controllable ignition and induction systems, they've failed to consistently reach the power and dependability levels of the roots design.

But in the high-tech arena, the centrifugal supercharger is second to none. So, when we started out to build a powerhouse LT1 stroker, with its combination of electronic fuel injection and OBD II computer system, there was no second-guessing the choice of adding a belt-driven 'charger. For our project, we decided upon the increasingly popular Procharger from Accessible Technologies Incorporated (ATI, for short).

We've had previous experience with the gurus at ATI involving both EFI and blow-through carbureted applications, and feel extremely confident about their products. (You may recall our '96 Camaro convertible, which has the company's smallest unit on its stock LT1 and made around 400 rear-wheel horsepower and more than 500 foot-pounds of torque!) For this application, however, we were talked into stepping up from the smallest unit to the more potent D-1 version. With a larger intake tract and impeller, the D-1 opened up the possibilities of power and torque levels that we've been eyeing. In a nutshell, the bigger blower bolted on the bigger engine should equal bigger performance.

But, you'll have to wait until next month to see the results, as this segment deals with the installation of the unit on its custom bracket. (Since the engine bay of the fourth-generation Camaro-which is where this bad boy will reside-is less than cavernous, the billet aluminum mounts that came with our unit were hand machined to make sure the blower was exactly where it needed to be.)

In addition to the installation procedure, we've included a retrospective on the work that went into the stock LT1's intake manifold by the wizards at Arizona Speed and Marine. From welding on bosses for the nitrous oxide nozzles to porting and blending the runners, you'll see why this manifold will be our Procharger's best ally in making big power numbers with our LT1 383.

Aeromotive Systems
218 W. 74th St.
Kansas City
MO  64114
P.O. Box 287
AR  72855
Airflow Research
28611 W. Industry Dr.
CA  91355
Cola Performance Products
19122 S. Santa Fe Ave.
Rancho Dominguez
CA  90021
Arizona Speed and Marine
6313 W. Commonwealth
AZ  85226
Crane Cams
530 Fentress Blvd.
Daytona Beach
FL  32114
531 Spectrum Circle
CA  93030
Federal Mogul/Fel-Pro
26555 Northwestern Hwy.
MI  48034
ATI ProCharger
14801 W. 114th Terr.
KS  66215
1960 Swarthmore Ave.
NJ  08701
www.manleyperformance .com
Beck Racing Engines
21616 N. Central Ave., Suite 1
AZ  85024
El Paso
TX  79936
Billet Fabrication
649-F Easy Street, Dept MMFF
Simi Valley
CA  93065
Pro Gram Engineering
P.O. Box 472
OH  44203
Carbon Components
223 17th St.
Huntington Beach
CA  92548
CNC Cylinder Heads
13001 Tree Ranch Rd.
CA  93023
Childs & Albert
24849 Anza Drive
CA  91355
4255 County Rd. 10 East
MN  55318
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