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Combo 17.
Combo 17 is the last combination from the AFR web site. This combo uses the same parts as Combo 16, except a more aggressive roller cam is used. This engine is over the 500 HP/ 500 ft-lbs mark—it could easily achieve low 10's in the quarter mile in a Nova, Camaro, Corvette, etc. This engine is one of the most powerful engines on my site and is perfectly streetable. Just imagine what a healthy dose of nitrous could do.
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| Displacement: |
383 cu. in. |
| Carburetor: |
Holley 750 double pumper |
| Heads: |
Air Flow Research 190cc Street |
| Intake: |
Air Flow Research FloPower RPM |
| Camshaft: |
Comp Cams hydraulic roller, with 236/242° of duration @ 0.050 in. lift, and 0.520/0.540 in. lift |
| Headers: |
1 3/4 in. |
| Distributor: |
MSD |
| Timing: |
34° |
| Comp. Ratio: |
9.5:1 |
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|
| MAX HP: |
503 @ 5500 |
| MAX Torque: |
517 @ 4500 |
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Combo 18.
Combo's 18 and 19 come from pages 50-51 of Engines 2000.
Combo 18 uses rebuilt GM heads with big valves, a long-duration camshaft, and a 750 double pumper carb. GM heads have always been mass-produced; this has caused GM to produce heads that meet both performance and economical needs. Therefore, it is usually more difficult to make GM heads flow as well as the performance-only aftermarket heads.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Holley 750 double pumper |
| Heads: |
GM #882 castings, milled to 71 cc, with 2.02/1.60 in. valves |
| Intake: |
Holley Contender |
| Camshaft: |
hydraulic, with 292° of duration, 230° of duration @ 0.050 in. lift, and 0.480 in. lift |
| Rockers: |
PAW 1.5:1 long slot |
| Pistons: |
PAW cast |
| Rods: |
stock |
| Crank: |
cast |
| Distributor: |
MSD Pro Billet HEI |
| Comp. Ratio: |
10:1 |
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| MAX HP: |
317 @ 5200 |
| MAX Torque: |
368 @ 3700 |
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Combo 19.
Combo 19 uses a 383 cu. in. stroker engine with Trick Flow Twisted Wedge heads and a street-oriented roller cam. This engine produces impressive power.
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| Displacement: |
383 cu. in. |
| Carburetor: |
Holley 650 double pumper |
| Heads: |
Trick Flow Specialties Twisted Wedge |
| Intake: |
Edelbrock Victor Jr., ported |
| Camshaft: |
Crane hydraulic roller, with 276/284° of duration, 214/222° of duration @ 0.050 in. lift, and 0.488/0.510 in. lift |
| Rockers: |
Crane 1.5:1 aluminum roller |
| Pistons: |
KB Performance hypereutectic |
| Rods: |
stock |
| Crank: |
cast |
| Distributor: |
MSD Pro Billet HEI |
| Comp. Ratio: |
9.8:1 |
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|
| MAX HP: |
451 @ 6000 |
| MAX Torque: |
445 @ 4500 |
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Combo 20.
Combo 20 comes from a web article that is cited on the last Combo page.
This engine combination is pretty close to Combo 19. A larger carb and more aggressive cam is used. The exact compression ratio is not mentioned, but it is probably closer to 9:1. This engine makes power and torque almost identical to Combo 19.
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| Displacement: |
383 cu. in. |
| Carburetor: |
Holley 750 double pumper |
| Heads: |
Trick Flow Specialties Twisted Wedge |
| Intake: |
Edelbrock Victor Jr. |
| Camshaft: |
Crane hydraulic roller, with 286/296° of duration, 230/236° of duration @ 0.050 in. lift, and 0.510/0.512 in. lift. |
| Rockers: |
Crane roller, 1.5:1 |
| Headers: |
1 5/8 in. |
| Pistons: |
KB hypereutectic |
| Rods: |
5.7 in. |
| Crank: |
cast |
| Comp. Ratio: |
9:1 to 10:1 |
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| MAX HP: |
450 @ 5750 |
| MAX Torque: |
445 @ 4750 |
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Combo 21.
Combo 21 comes from page 60 of the January 1990 Hot Rod Magazine.
This engine combo has 383 cu. in. of displacement, a 750 cfm carb, Brodix -8 heads, a Performer intake, and a short-duration roller cam. The Brodix -8 heads are made to compete with the Sportsman II's, Iron Eagle's, and other similarly-priced heads. This build-up produces a good amount of power and lots of torque.
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| Displacement: |
383 cu. in. |
| Carburetor: |
Holley 750 |
| Heads: |
Brodix -8 |
| Intake: |
Edelbrock Performer |
| Camshaft: |
Crane hydraulic roller 278, with 278° of duration, 222° of duration @ 0.050 in. lift, and 0.470 in. of lift |
| Rockers: |
Crane aluminum roller, 1.6:1 |
| Headers: |
Cyclone Corvette 1 5/8 in. |
| Pistons: |
Manley flat tops |
| Rods: |
Chevy High Performance forged 5.7 in. |
| Crank: |
cast |
| Distributor: |
MSD with a 7AL module |
| Comp. Ratio: |
10:1 |
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|
| MAX HP: |
431 @ 5500 |
| MAX Torque: |
452 @ 4000 |
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Combo 22.
Combos 22-23 come from page 64 of the March 1997 issue of Car Craft Magazine. The first combo is the stock engine, and the next is the engine rebuilt with aftermarket parts.
Combo 22 is a stock engine. Notice the smaller valves, the long duration but short lift of the cam, and the Quadrajet carb. This combination produces a low 248 HP but a street-oriented 330 ft-lbs of torque.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Quadrajet |
| Heads: |
GM #882 castings, milled to 71cc, with 1.94/1.50 in. valves, and a 3-angle valve job |
| Intake: |
GM cast iron |
| Camshaft: |
GM, with 280/294° of duration, 204/202° of duration @ 0.050 in. lift, and 0.389/0.408 in. of lift. |
| Headers: |
1 3/4 in. with 3 in. Flowmaster exhaust |
| Pistons: |
GM cast domed (2.4cc) |
| Rods: |
stock |
| Crank: |
cast |
| Distributor: |
stock |
| Timing: |
34° |
| Comp. Ratio: |
10:1 |
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| MAX HP: |
248 @ 4600 |
| MAX Torque: |
330 @ 3600 |
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Combo 23.
Combo 23 uses Holley Systemax II components. The cam seems a little big for street use, but Holley designed the parts of this kit to work together. It increases power by 152 HP and 76 ft-lbs of torque. If you compare this engine to engines with other aftermarket heads, this combo does not make as much power. Holley heads do not seem to be quite as good as comparable heads, although they still cost as much.
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| Displacement: |
355 cu. in. |
| Carburetor: |
Holley 750 double pumper |
| Heads: |
Holley Systemax II, with 2.02/1.60 in. valves, and 185 cc intake runners |
| Intake: |
Holley Systemax II |
| Camshaft: |
Holley Systemax II, with 296/304° of duration, 234/242° of duration @ 0.050 in. lift, and 0.479/0.495 in. of lift. (Corrected valve lift with 1.52:1 rockers is 0.485/0.502 in.) |
| Rockers: |
Comp Cams Pro Magnum roller 1.52:1 |
| Headers: |
1 3/4 in. with 3 in. Flowmaster exhaust |
| Pistons: |
GM cast domed (2.4cc) |
| Rods: |
stock |
| Crank: |
cast |
| Distributor: |
MSD Pro Billet HEI |
| Timing: |
36° |
| Comp. Ratio: |
10.2:1 |
|
|
| MAX HP: |
400 @ 6000 |
| MAX Torque: |
406 @ 4200 |
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Combo 24.
Combo 24 comes from the Edelbrock web site.
This engine uses the Edelbrock RPM kit. This camshaft is even more aggressive than the Holley cam, and it is on the ragged edge of street use. Again, though, the designers made the components of the kit to work together. This engine makes a respectable amount of power and torque.
| |
| Displacement: |
355 cu. in. |
| Carburetor: |
Edelbrock 750 |
| Heads: |
Edelbrock Performer RPM |
| Intake: |
Edelbrock Performer RPM |
| Camshaft: |
Edelbrock Performer RPM, with 308/318° of duration, 234/244° of duration @ 0.050 in. lift, and 0.488/0.510 in. of lift. |
| Headers: |
1 3/4 in. |
| Pistons: |
TRW |
| Rods: |
stock, polished and shotpeened |
| Crank: |
stock steel |
| Distributor: |
MSD 6A |
| Timing: |
36° |
| Comp. Ratio: |
9.5:1 |
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|
| MAX HP: |
420 @ 6000 |
| MAX Torque: |
415 @ 4500 |
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