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21st Century Tri-Power 507 HorsePower Engine - Pontiac Tech
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An MSD Pro Billet distributor... An MSD Pro Billet distributor and coil are augmented with Taylor wires and NGK spark plugs. Total timing is all in by 3,200 rpm. | HEADS | | Casting | Edelbrock | | Chambers | Open | | Mods | Street/strip port andpolish by Ken Wilhelm | | Combustion Chamber Volume | 72cc | | Maximum Flow at 28 Inches of WaterIntake | 300 cfm at 0.700-inch lift | | Exhaust | 215 cfm at 0.700-inch lift | | Compression Ratio | 10.31 | | Valves | Edelbrock 2.11/1.66-in | | Angles Used in Valve Job Intake | 30/45/60-deg | | Exhaust | 60/45-deg and radius | | Mods | Back cut | | Retainers, Keepers, Guides, Seals | Edelbrock | | Rocker Arms | Crane roller, 1.51 | | Pushrods | Comp Cams High-Tech, 5/16-in | | Length | 8.65-in | Scheduling issues led to a... Scheduling issues led to a change of venue for the next round of dyno tests. The 449 Tri-Power Pontiac is now installed on the Super Flow 901 dyno at Michael's Racing Engines in Macedonia and awaits its tests. Baselines were recorded and corrected to the standard of 29.92 inches of mercury, 60 degrees F, and 0 (zero) humidity. | CAM | | Brand | Comp Cams XR288HRhydraulic roller | | Duration at 0.050 | 236/242-deg | | Duration Advertised | 288/294-deg | | Lift | 0.520/0.540-in | | Centerline | 106-deg | | Lobe-Separation Angle | 110-deg | | Installed Position | 107-deg | | Lifters | Comp Cams hydraulic roller | | Valvesprings | Comp Cams 99-16, dual | | Seat Pressure | 150 pounds | | Open Pressure | 330 pounds | | Timing Chain | Comp Cams double-roller | | INDUCTION | | Type | Barry Grant SixShooterTri-Power system | | Size CFM | 250x3 | | Mods | None | | Jets, Center Carb | No. 68 main,6.5 power valve | | Jets, End Carbs | No. 68 jets,no power valves | | Fuel Pump | Dyno supplied | | FueL-Line Size | No. 6 AN braided | | Intake Manifold | Barry GrantSixShooter dual-plane high-rise | | Mods | None | | IGNITION | | Distributor | MSD Pro-Billet | | Coil | MSD | | Wires | Taylor | | Spark Plugs | NGK | | Total Timing | 32 to 36 (depending ondyno pull) | | RPM Total Timing Is Reached | 3,200 | | EXHAUST | | Headers | Doug's | | Primary Tube Diameter | 1.875-in | | Collector Size | 3-in |  Bryan and Jeff Gulley tune...  Bryan and Jeff Gulley tune the 449 between pulls. Through the course of the testing, jetting was richened from No. 68s in the center and end carbs to No. 70s in the center and No. 73s on the end carbs. Bryan also adjusted the timing from the initial setting of 36 degrees to 34 degrees and even tried 32 degrees. The engine liked 34 degrees the best.  Michael Tietro, of Michael's...  Michael Tietro, of Michael's Racing Engines, operated the dyno. By the end of testing, the 449 had produced 507.6 hp and 528.3 lb-ft of torque.
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Barry Grant Inc.
1450 McDonald Road,
Dept. MMFF
Dahlonega
GA
30533
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Michaels Racing Engines
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Edelbrock Corporation
2700 California St.
Torrance
CA
90503
310-782-2222
www.edelbrock.com
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Penfound Design
www.penfounddesign.com
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Ken's Performance
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Weber Racing Equipment
www.wre.com
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