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Combo 85.
Combo 85 comes from pages 25-28 of the October 1996 issue of Chevy High Performance.
Combo 85 uses a 357 cu. in. engine from Powerhouse. Rebuilt GM heads and an aggressive Elgin cam help to produce 360 HP and 394 ft-lbs of torque.
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| Displacement: |
357 cu. in. |
| Carburetor: |
Holley 600 |
| Heads: |
GM, with 1.94/1.50 in. valves, 76 cc combustion chambers, and a 3-angle valve job. |
| Intake: |
Edelbrock Performer |
| Camshaft: |
Elgin hydraulic, with 0.488 in. of lift |
| Rockers: |
Elgin |
| Headers: |
1 7/8 in. |
| Pistons: |
Powerhouse |
| Rods: |
stock |
| Crank: |
cast |
| Distributor: |
HEI with MSD |
| Timing: |
36° |
| Comp. Ratio: |
9.7:1 |
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| MAX HP: |
360 @ 5000 |
| MAX Torque: |
394 @ 4500 |
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Combo 86.
Combo 86 comes from page 141 of the October 1996 issue of Chevy High Performance.
This combo is a giveaway engine from Summit. The Trick Flow Twisted Wedge heads and moderate camshaft produce 363 HP and 400 ft-lbs of torque.
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| Displacement: |
350 cu. in. |
| Carburetor: |
Holley 650 double pumper |
| Heads: |
Trick Flow Twisted Wedge, with 2.02/1.60 in. valves |
| Intake: |
Edelbrock Performer RPM |
| Camshaft: |
Summit hydraulic, with 272° of duration and 0.454 in. of lift. |
| Pistons: |
TRW forged |
| Rods: |
stock |
| Crank: |
Engine Shop |
| Distributor: |
Accel Blueprint HEI with an Accel HEI Supercoil |
| Comp. Ratio: |
streetable |
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| MAX HP: |
363 @ 5500 |
| MAX Torque: |
400 @ 4750 |
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Combo 87.
Combo 87 comes from pages 82-89 of the September 1998 issue of Super Chevy.
A 355 from the 70's is freshened by Trick Flow heads, a Lunati roller cam, and a 750 Holley to make 147 extra HP. The roller cam has a little more lift than the rest of the combos on this site, with 0.661 in. of valve lift. Although very much on the big side, this combination can prove to be a very streetable engine.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Holley 750 |
| Heads: |
Trick Flow Twisted Wedge |
| Intake: |
Edelbrock Victor Jr. |
| Camshaft: |
Lunati mechanical street roller, with 294° of duration and 0.620 in. of lift.(Corrected valve lift with 1.6:1 rocker arms is a lofty 0.661 in.) |
| Rockers: |
Summit roller, 1.6:1 |
| Pistons: |
forged |
| Rods: |
forged |
| Crank: |
steel |
| Timing: |
35° |
| Comp. Ratio: |
10.0:1 |
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| MAX HP: |
455 @ 6100 |
| MAX Torque: |
435 @ 5000 |
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Combo 88.
Combos 88-91 come from pages 42-46 of the March 2000 issue of Popular Hot Rodding. A GM ZZ4 crate engine is tested with the crate L98 aluminum Corvette heads, L31 iron Vortec heads, and GM "Fast Burn" aluminum heads. Two intakes and two camshafts are used in the four combinations.
Combo 88 is the ZZ4 crate motor in shipped form with the Corvette heads. With all of the new GM components and a Demon 750 carb, this combination makes 356 HP and 408 ft-lbs of torque.
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| Displacement: |
350 cu. in. |
| Carburetor: |
Demon 750 |
| Heads: |
GM L98 Corvette aluminum, with 1.94/1.50 in. valves and angled plugs |
| Intake: |
GM aluminum Eliminator dual-plane, PN 12464340 |
| Camshaft: |
GM steel roller, with 0.474/0.510 in. of lift. |
| Rockers: |
GM stamped steel, 1.5:1 |
| Exhaust: |
Hooker headers and Flowmaster 3-chamber mufflers |
| Pistons: |
GM |
| Rods: |
GM forged |
| Crank: |
GM |
| Distributor: |
HEI |
| Timing: |
35° |
| Comp. Ratio: |
10.0:1 |
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| MAX HP: |
356 @ 5500 |
| MAX Torque: |
408 @ 3800 |
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Combo 89.
Combo 89 replaces the L98 heads with L31 Vortec heads. These heads require a Vortec-compatible intake manifold, and an Edelbrock Super Victor Vortec single-plane is used with this combination. Apparently, this Edelbrock intake is similar to a single-plane GM intake, the Eliminator, with PN 12496822. This head and intake swap produces 20 more HP and about 380 ft-lbs of torque.
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| Displacement: |
350 cu. in. |
| Carburetor: |
Demon 750 |
| Heads: |
GM L31 Vortec, with 1.94/1.50 in. valves |
| Intake: |
Edelbrock Super Victor Vortec |
| Camshaft: |
GM steel roller, with 0.474/0.510 in. of lift. |
| Rockers: |
GM stamped steel, 1.5:1 |
| Exhaust: |
Hooker headers and 3-chamber Flowmaster mufflers |
| Pistons: |
GM |
| Rods: |
GM forged |
| Crank: |
GM |
| Distributor: |
HEI |
| Timing: |
32° |
| Comp. Ratio: |
9.5–10.0:1 |
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| MAX HP: |
376 @ 5600 |
| MAX Torque: |
380 @ 4700 (approximate from a graph) |
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Combo 90.
Combo 90 uses GM Fast Burn heads and a GM "hot cam," with more lift. The Fast Burn heads usually cost about twice the price of the Vortecs, and this combo produces 42 more HP and about 30-40 more ft-lbs of torque.
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| Displacement: |
350 cu. in. |
| Carburetor: |
Demon 750 |
| Heads: |
GM Fast Burn |
| Intake: |
GM aluminum dual-plane, PN 12464340; or an Edelbrock Performer RPM. |
| Camshaft: |
GM steel roller "hot cam," with 0.492 in. of lift and 210/220° of duration @ 0.050 in. of lift.(Corrected valve lift with 1.6:1 rockers is 0.525 in.) |
| Rockers: |
GM self-aligning roller, 1.6:1 |
| Exhaust: |
Hooker headers and 3-chamber Flowmaster mufflers |
| Pistons: |
GM |
| Rods: |
GM forged |
| Crank: |
GM |
| Distributor: |
HEI |
| Timing: |
35° |
| Comp. Ratio: |
9.5–10.0:1 |
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| MAX HP: |
418 @ 5900 |
| MAX Torque: |
406 @ 4300 |
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Combo 91.
Combo 91 is exactly like Combo 90, except a single-plane intake is used. Since the Fast Burn heads have holes drilled for both standard, angled intake bolts and Vortec-style intake bolts, the Edelbrock Super Victor Vortec intake could be used. This change produces 14 more HP and 6 more ft-lbs.
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| Displacement: |
350 cu. in. |
| Carburetor: |
Demon 750 |
| Heads: |
GM Fast Burn |
| Intake: |
Edelbrock Super Victor Vortec |
| Camshaft: |
GM steel roller "hot cam," with 0.492 in. of lift and 210/220° of duration @ 0.050 in. of lift.(Corrected valve lift with 1.6:1 rockers is 0.525 in.) |
| Rockers: |
GM self-aligning roller, 1.6:1 |
| Exhaust: |
Hooker headers and 3-chamber Flowmaster mufflers |
| Pistons: |
GM |
| Rods: |
GM forged |
| Crank: |
GM |
| Distributor: |
HEI |
| Timing: |
35° |
| Comp. Ratio: |
9.5–10.0:1 |
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| MAX HP: |
432 @ 6100 |
| MAX Torque: |
412 @ 4700 |
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Combo 92.
Combo 92 comes from pages 24-28 of the August 2001 issue of Hot Rod.
Combo 92 is a 427 cu. in. small block with 482 HP and 545 ft-lbs. of torque. Need I say more?
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| Displacement: |
427 cu. in. World Products MoTown (4.185 in. bore x 3.875 in. stroke) |
| Carburetor: |
Holley 750 with a Holley 850 base—flow is 870 cfm. |
| Heads: |
World Products MoTown 220, with 2.08/1.60 valves |
| Intake: |
World Products dual plane |
| Camshaft: |
Crane solid, with 0.516/0.525 in. of lift and 244/252° of duration @ 0.050 in. of lift. |
| Rockers: |
Manley aluminum roller, 1.5:1 |
| Pistons: |
forged aluminum (4.185 in. bore). |
| Rods: |
Manley 4340 forged steel H-beam 6.0 in. |
| Crank: |
4130 forged steel (3.875 in. stroke). |
| Distributor: |
HEI |
| Timing: |
36° |
| Comp. Ratio: |
10.0:1 |
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| MAX HP: |
482 @ 5800 |
| MAX Torque: |
545 @ 3800 |
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