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Combo 108.
Combos 108 and 109 come from pages 80-87 of the November 2001 issue of Chevy High Performance. Both combos use a 355 cu. in. engine with GM L31 Vortec heads and a GM "HOT" roller cam.
The only difference between the two combinations is the intake.
Combination 107 uses a dual plane, which makes a little bit more torque.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Speed Demon 750 with mechanical secondaries |
| Heads: |
GM L31 Vortec |
| Intake: |
GMPP Vortec dual-plane |
| Camshaft: |
GMPP HOT hydraulic roller, with 0.525/0.525 in. of lift and 218�/228� of duration @ 0.050 in. of lift. |
| Exhaust: |
Hooker 1 5/8 in. headers with Flowmaster 2 1/2 mufflers |
| Pistons: |
stock |
| Rods: |
stock |
| Crank: |
GM |
| Ignition: |
Stinger electronic with MSD 6 |
| Timing: |
34� |
| Comp. Ratio: |
9.75:1 |
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| MAX HP: |
412 @ 5600 |
| MAX Torque: |
423 @ 4400 |
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Combo 109.
Combo 109 swaps an Edelbrock Super Victor intake for the Vortec dual
plane. With 1 1/2 in. of spacer, this engine gained 10 horses but lost
5 ft-lbs.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Speed Demon 750 and a 1 1/2 in. spacer |
| Heads: |
GM L31 Vortec |
| Intake: |
Edelbrock Super Victor single plane |
| Camshaft: |
GMPP HOT hydraulic roller, with 0.525/0.525 in. of lift and 218�/228� of duration @ 0.050 in. of lift. |
| Exhaust: |
Hooker 1 5/8 in. headers with Flowmaster 2 1/2 mufflers |
| Pistons: |
stock |
| Rods: |
stock |
| Crank: |
GM |
| Ignition: |
Stinger electronic with MSD 6 |
| Timing: |
32� |
| Comp. Ratio: |
9.75:1 |
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| MAX HP: |
422 @ 5700 |
| MAX Torque: |
418 @ 5000 |
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