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Combo 97.
Combo 97 upgrades to a larger Magnum camshaft. It has 0.507 in. of lift and 292° of duration (244° @ 0.050 in. of lift). 431 HP and 400 ft-lbs are produced. |
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Displacement: |
350 cu. in. |
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Carburetor: |
Holley 750 double pumper |
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Heads: |
Air Flow Research 190, with 2.02/1.60 in. valves |
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Intake: |
Edelbrock Performer RPM |
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Camshaft: |
Comp Cams Magnum hydraulic, with 292° of duration, 244° of duration @ 0.050 in. of lift, and 0.501 in. of lift (Corrected valve lift with 1.52:1 rockers is 0.507 in.). |
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Rockers: |
Comp Cams Pro Magnum roller, 1.52:1 |
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Exhaust: |
1 3/4 in. Hooker headers with 3 in. Flowmasters |
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Pistons: |
GM high-silicon aluminum |
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Rods: |
stock |
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Crank: |
GM forged |
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Ignition: |
Mallory distributor with an MSD 6AL box |
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Timing: |
36° |
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Comp. Ratio: |
9.5:1 |
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MAX HP: |
431 @ 6700 |
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MAX Torque: |
400 @ 4500 |
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Combo 98.
Combos 98-102 come from pages 23-30 of the September 2001 issue of Chevy High Performance. Each of the 5 engines is a different build-up that makes more power than its predecessor.
Combo 98 uses World Products S/R Torquers and a smaller camshaft to produce 330 HP and 410 ft-lbs. |
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Displacement: |
355 cu. in. |
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Carburetor: |
Holley 750 |
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Heads: |
World Products S/R Torquer, with 2.02/1.60 in. valves |
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Intake: |
Edelbrock Performer RPM |
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Camshaft: |
Comp Cams Xtreme Energy hydraulic, with 250/260° of duration, 206/212° of duration @ 0.050 in. of lift, and 0.432/0.444 in. of lift. |
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Headers: |
1 5/8 in. |
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Comp. Ratio: |
9.25:1 |
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MAX HP: |
330 @ 5000 |
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MAX Torque: |
410 @ 3500 |
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Combo 99.
Combo 99 uses Vortec heads and a bigger cam than Combo 98. The heads are pocket ported, and this helps the engine to make 409 HP and 427 ft-lbs of torque. The torque peak occurs at 3500 RPM, but the power peak is at 6000 RPM. The torque peak is only at 58% of the power peak, instead of the normal 70-80%. |
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Displacement: |
350 cu. in. |
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Carburetor: |
Holley 750 double-pumper |
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Heads: |
GM L31 Vortecs, pocket-ported, with 1.94/1.50 in. valves |
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Intake: |
Edelbrock Performer RPM Vortec |
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Camshaft: |
Comp Cams Xtreme Energy 268 hydraulic, with 0.478/0.480 in. of lift and 224/230° of duration @ 0.050 in. of lift. |
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Exhaust: |
Hedman 1 5/8 in. headers and Borla XR-1 mufflers |
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Distributor: |
HEI |
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Comp. Ratio: |
9.4:1 |
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MAX HP: |
409 @ 6000 |
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MAX Torque: |
427 @ 3500 |
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Combo 100.
Combo 100 is a 383 cu. in. engine with 10:1 compression and Trick Flow 23° heads. The Comp Cams mechanical street roller cam allows this mule to make 454 HP and 469 ft-lbs of torque. A 383 cu. in. engine with high-flowing heads and a massive cam should not use 1 5/8 in. headers like this combination. With 1 3/4 in. headers, the previously restricted engine would have produced more power and torque. |
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Displacement: |
383 cu. in. |
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Carburetor: |
Holley 750 double-pumper |
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Heads: |
Trick Flow 23° aluminum |
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Intake: |
Edelbrock Performer RPM |
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Camshaft: |
Comp Cams mechanical street roller, with 0.570/0.576 in. of lift and 242/248° of duration @ 0.050 in. of lift. |
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Exhaust: |
Hedman 1 5/8 in. headers and Borla ZR-1 mufflers |
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Pistons: |
SRP forged |
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Rods: |
SCAT |
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Crank: |
SCAT |
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Ignition: |
Crane HI-6 |
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Comp. Ratio: |
10:1 |
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MAX HP: |
454 @ 6000 |
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MAX Torque: |
469 @ 4000 |
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