Combo 39. Combo 39 comes from pages 87-93 of the Winter 2002 Camaro Performers. Combo 39 uses a 391 stroker crank and Holley heads to make 453 HP and ft-lbs of torque. Some nice components are used in this combination.		Displacement: 391 cu. in. (3.832 in. stroke) Carburetor: Holley 770 vacuum secondary with both an open and holed spacer Heads: Holley Street Avenger Intake: Holley Street Avenger Camshaft: Lunati hydraulic flat tappet, with 0.569/0.576 in. of lift and 245/255° of duration @ 0.050 in. lift Rockers: Lunati aluminum roller, 1.6:1 Pistons: JE forged Rods: C.A.T. 4340 H-beam, 5.7 in. Crank: C.A.T. 4340 forged steel (offset ground to make 3.832 in. stroke) Comp. Ratio: 10.25:1 MAX HP: 453 @ 5800 MAX Torque: 453 @ 4200
Combo 40. Combos 40-43 come from allchevyengines.com. Combo 40 uses the World Products S/R Torquer heads, a Performer RPM intake, and a moderate to high-performance camshaft. This combination produces 366 HP and 372 ft-lbs of torque.		Displacement: 350 cu. in. Heads: World Products S/R Torquer Intake: Edelbrock Performer RPM Camshaft: Crane Cams 278, with 278° of duration, 222° of duration @ 0.050 in. lift, and 0.470 in. lift Rockers: Crane Cams Hi-Intensity roller Pistons: TRW hypereutectic Rods: Eagle forged Crank: GM cast Comp. Ratio: 10.0:1 MAX HP: 366 @ 5500 MAX Torque: 372 @ 4000
Combo 41. Combo 41 uses the same components from Combo 40 except the engine is 383 cu. in. and the intake is a regular Performer. Strangely, this combination makes 7 less HP than the previous example. Perhaps this can all be attributed to the RPM intake. The stroker engine does produce 39 more ft-lbs of torque, as is expected from the longer stroke.		Displacement: 383 cu. in. Heads: World Products S/R Torquer Intake: Edelbrock Performer Camshaft: Crane Cams 278, with 278° of duration, 222° of duration @ 0.050 in. lift, and 0.470 in. of lift Pistons: TRW hypereutectic flat tops Rods: Eagle forged Crank: Elgin cast steel Comp. Ratio: 10.0:1 MAX HP: 359 @ 5000 MAX Torque: 411 @ 3500
Combo 42. Combos 42 uses a 383 cu. in. engine with Sportsman II heads, a Performer RPM intake, and a more aggressive cam than Combo 41. This makes 55 more HP and 41 more ft-lbs of torque.		Displacement: 383 cu. in. Heads: World Products Sportsman II Intake: Edelbrock Performer RPM Camshaft: Crane Cams 284, with 284° of duration, 228° of duration @ 0.050 in. lift, and 0.488 in. of lift Rockers: Crane Cams roller Pistons: TRW hypereutectic Rods: Eagle forged Crank: Elgin cast steel Comp. Ratio: 10.0:1 MAX HP: 414 @ 6000 MAX Torque: 452 @ 4500
Combo 43. Combo 43 uses even better heads than Combo 42, and a moderate roller cam is used. This combo makes 22 more HP and 4 less ft-lbs of torque.		Displacement: 383 cu. in. Heads: Dart Pro 1 aluminum, with 2.05/1.60 in. valves Intake: Edelbrock Performer RPM Camshaft: Comp Cams hydraulic roller, with 244° of duration @ 0.050 in. lift, and 0.525 in. of lift Rockers: Crane aluminum roller Pistons: TRW hypereutectic Rods: Eagle forged Crank: Elgin cast steel Comp. Ratio: 10.0:1 MAX HP: 436 @ 5500 MAX Torque: 448 @ 4000
Combo 44. Combo 44 comes from page 3 of the August '98 small Summit catalog. This engine is almost identical to Combo 19. Although less information is given, maybe this combo is still helpful. It uses a 383 cu. in. stroker engine with Trick Flow Twisted Wedge heads. The roller cam is just a little more aggressive than the cam in Combo 19.		Displacement: 383 or 385 cu. in. Heads: Trick Flow Specialties Twisted Wedge Intake: Edelbrock Victor Jr. Camshaft: Crane hydraulic roller, with 230/236° of duration @ 0.050 in. lift, and 0.510/0.520 in. lift Rockers: Crane 1.5:1 aluminum roller Pistons: KB Performance hypereutectic Rods: 5.7 in. Crank: cast MAX HP: 450 @ 5750 MAX Torque: 445 @ 4750
Combo 45. Combo 45 comes from pages 29-31 of Engines 2000. Combo 45 uses a 383 cu. in. stroker engine with World Products S/R Torquer cylinder heads and a Comp Cams Xtreme Energy camshaft. Since the engine is built strictly as a torque-producing engine, the combination produces 338 HP and 426 ft-lbs of torque.		Displacement: 383 cu. in. Carburetor: Holley 750 double pumper Heads: World Products S/R Torquer, bowl blended Intake: Edelbrock Performer RPM Camshaft: Comp Cams Xtreme Energy, with 256/268° of duration, 212/218° of duration @ 0.050 in. lift, and 0.447/0.454 in. lift. (Corrected valve lift with 1.52:1 rockers is 0.453/0.460 in.) Rockers: Comp Cams Magnum roller 1.52:1 Pistons: cast Rods: 5.7 in. Crank: SCAT cast Distributor: MSD Pro Billet HEI Timing: 30° Comp. Ratio: 9.6:1 MAX HP: 338 @ 4800 MAX Torque: 426 @ 3600
Combo 46. Combo 46 comes from pages 25-29 of the March 1990 issue of Hot Rod Magazine. Combo 46 uses a 420 cu. in. stroker small block. In the article, this engine is to be used as a sleeper engine for a 1985 Monte Carlo SS. The ignition is computerized, but an engine without a computer could probably see similar results. This engine produces 425 HP and 446 ft-lbs.		Displacement: 420 cu. in. Carburetor: Reworked factory electronic Quadrajet Heads: Dart II (180 cc intake runners and 2.02/1.60 in. valves), bowl-ported and blended, port-matched to the intake, 3-angle valve job Intake: Reworked factory aluminum, port-matched to the heads Camshaft: Comp Cams Magnum 280, with 280° of duration, 230° of duration @ 0.050 in. lift, with 0.480 in. lift. (Corrected valve lift with 1.6:1 rockers is 0.512 in.) Rockers: Comp Cams Magnum roller 1.6:1 Headers: Edelbrock tubular with a Turbo City Grand National dual-exhaust system Pistons: JE forged alloy, 4.155 in. bore Rods: Comp Cams Magnum 6 in. Crank: Callies 4340 steel, 3.875 in. stroke Comp. Ratio: 9.0:1 MAX HP: 425 @ 5500 MAX Torque: 446 @ 4500

Combo 47. Combos 47-52 come from pages 40-50 of the October 1990 Hot Rod Magazine. These six combos use a GM Goodwrench crate engine. The engine is first tested stock, and performance enhancements are done for each new combination. Combo 47 is the stock run of the crate motor. The camshaft is low-performance, and the intake is cast-iron. With other stock components, this combo makes a meager 224 HP, but the engine produces a nice amount of torque (335 ft-lbs).		Displacement: 350 cu. in. Carburetor: 1971 Quadrajet with #74 primary jets and a #45 metering rod Heads: GM castings, with 78 cc combustion chambers, 1.94/1.50 in. valves, and a 2-angle valve job Intake: 1969 GM non-EGR cast iron Camshaft: GM L69, with 192/202° of duration @ 0.050 in. lift, and 0.383/0.405 in. lift Exhaust: stock cast-iron exhaust manifolds with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 7.8:1 MAX HP: 224 @ 4000 MAX Torque: 335 @ 3000
Combo 48. Combo 48 uses the same setup as Combo 47, except the exhaust manifolds are exchanged for some Hedman headers running through the same pipes and mufflers. This improves power by 18 HP and torque by 10 ft-lbs.		Displacement: 350 cu. in. Carburetor: 1971 Quadrajet with #74 primary jets and a #45 metering rod Heads: GM castings, with 78 cc combustion chambers, 1.94/1.50 in. valves, and a 2-angle valve job Intake: 1969 GM non-EGR cast iron Camshaft: GM L69, with 192/202° of duration @ 0.050 in. lift, and 0.383/0.405 in. lift Headers: Hedman 1 5/8 in. headers with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 7.8:1 MAX HP: 242 @ 4000 and 4250 MAX Torque: 345 @ 3000
Combo 49. Combo 49 improves upon Combo 48 by using a Holley 750 double pumper carb and Holley Contender intake. This results in 256 HP and 345 ft-lbs of torque.		Displacement: 350 cu. in. Carburetor: Holley 750 double pumper Heads: GM castings, with 78 cc combustion chambers, 1.94/1.50 in. valves, and a 2-angle valve job Intake: Holley Contender Camshaft: GM L69, with 192/202° of duration @ 0.050 in. lift, and 0.383/0.405 in. lift Headers: Hedman 1 5/8 in. headers with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 7.8:1 MAX HP: 256 @ 4250 MAX Torque: 345 @ 3250
Combo 50. A more aggressive camshaft is used in Combo 50. This is the only difference between Combo 50 and 49. The swap makes 17 more HP and 8 more ft-lbs of torque.		Displacement: 350 cu. in. Carburetor: Holley 750 double pumper Heads: GM castings, with 78 cc combustion chambers, 1.94/1.50 in. valves, and a 2-angle valve job Intake: Holley Contender Camshaft: Crane hydraulic, with 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. lift Headers: Hedman 1 5/8 in. headers with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 7.8:1 MAX HP: 273 @ 4750 MAX Torque: 353 @ 3750
Combo 51. Combo 51 improves Combo 50 by using an even more aggressive cam. Although this cam is not wild by any means, it is quite a jump from the stock cam that was used in the beginning. Power is increased to 297 HP, and the torque goes up to 355 ft-lbs.		Displacement: 350 cu. in. Carburetor: Holley 750 double pumper Heads: GM castings, with 78 cc combustion chambers, 1.94/1.50 in. valves, and a 2-angle valve job Intake: Holley Contender Camshaft: Crane hydraulic, with 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. lift Headers: Hedman 1 5/8 in. headers with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 7.8:1 MAX HP: 297 @ 5250 MAX Torque: 355 @ 3500 and 3750
Combo 52. Combo 52 is quite different than the previous five. Aluminum Corvette aluminum heads are used along with 1 3/4 in. headers. Since the Corvette heads have 58 cc combustion chambers, the compression ratio jumps from 7.8:1 to 9.9:1. The new heads produce 15 more HP and 14 more ft-lbs of torque.		Displacement: 350 cu. in. Carburetor: Holley 750 double pumper Heads: Corvette aluminum, with 58 cc combustion chambers and 1.94/1.50 in. valves, (PN 10134336) Intake: Holley Contender Camshaft: Crane hydraulic, with 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. lift Headers: Hedman 1 3/4 in. headers with 2 1/4 in. pipes and Thrush Turbo mufflers Pistons: cast Rods: stock Crank: cast Comp. Ratio: 9.9:1 MAX HP: 312 @ 5250 and 5500 MAX Torque: 369 @ 3250 and 3500
Combo 53. Combos 53-54 come from pages 58-60 of the October 1990 Hot Rod Magazine. Back in 1990, these combos were two examples of the engines offered by American Speed. Both engines make some great power and torque. Combo 53 uses rebuilt #993 GM heads with 2.02/1.60 in. valves. The camshaft is a healthy grind, with 234° of duration @ 0.050 in. of lift. This 355 cu. in. engine produces 421 HP and 438 ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: 750 Holley vacuum secondary Heads: GM #993 castings, ported, with 2.02/1.60 in. valves and a 3-angle valve job Intake: Edelbrock Victor Jr. and a 2 in. open-plenum spacer Camshaft: Cam Dynamics 290, with 290° of duration, 234° of duration @ 0.050 in. lift, and 0.494 in. of lift Headers: 1 7/8 in. Pistons: Speed-Pro forged flat tops Rods: stock Crank: cast Comp. Ratio: 9.0:1 to 10.0:1 MAX HP: 421 @ 5300 MAX Torque: 438 @ 4700
Combo 54. Combo 54 uses a 383 cu. in. engine with rebuilt GM heads. Using 2.05/1.60 in. valves, this engine produces power over 500 HP. However, a very aggressive mechanical camshaft is used to make this power. Streetablity is a very questionable aspect of a cam with 316/323° of duration.		Displacement: 383 cu. in. Carburetor: 750 Holley vacuum secondary Heads: GM castings, ported, with 2.05/1.60 in. valves and a 3-angle valve job Intake: Edelbrock Performer RPM and a 1 in. open-plenum spacer Camshaft: GM #141 mechanical (PN 3927140), with 316/323° of duration, 256/268° of duration @ 0.050 in. lift, and 0.469/0.483 in. of lift Rockers: Crane roller Headers: 1 7/8 in. Pistons: Speed-Pro forged flat tops Rods: stock Crank: cast Timing: 36° Comp. Ratio: 10.0:1 MAX HP: 510 @ 5600 MAX Torque: 481 @ 5300

Combo 55. Combos 55-62 come from pages 30-34 of the April 1991 issue of Hot Rod Magazine. All 8 combinations use the same 355 cu. in. block. Both stock and ported versions of the Dart SR (now the World Products S/R Torquer) are used on this engine. Also, different cams and rocker arm ratios are used to vary power and torque. Combo 55 has Stock Dart SR heads, a 650 cfm carb, a 260° camshaft, and 1.5:1 rockers. This combo makes 305 HP and 381 ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job Intake: Holley Contender Camshaft: Crane 260, with 260/272° of duration, 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. of lift Rockers: 1.5:1 intake and exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 305 @ 5000 MAX Torque: 381 @ 3500
Combo 56. Combo 56 only changes the rocker arm ratio of the exhaust valves in Combo 55. This increase from 1.5:1 to 1.6:1 creates 6 more HP and 10 more ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job Intake: Holley Contender Camshaft: Crane 260, with 260/272° of duration, 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. of lift. (Corrected valve lift with 1.6:1 exhaust rockers is 0.427/0.484 in.) Rockers: 1.5:1 intake; 1.6:1 exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 311 @ 5000 MAX Torque: 391 @ 3500
Combo 57. Combo 57 goes back to 1.5:1 rocker ratios for both intake and exhaust. However, a more aggressive cam is used. Compared to Combo 55, with the same rockers, this combination produced 17 more HP and 5 less ft-lbs of torque. As cam duration grows, cylinder pressure drops. This decrease in pressure causes a decrease in force pushing the piston downward, and thus the torque is reduced.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job Intake: Holley Contender Camshaft: Crane 272, with 272/284° of duration, 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. of lift. Rockers: 1.5:1 intake and exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 322 @ 5500 MAX Torque: 376 @ 3500
Combo 58. Combo 58 changes the rocker arm ratio of the exhaust valves in Combo 57. This exhaust rocker ratio increase creates 4 more HP and 2 more ft-lbs of torque. The increase here is not as pronounced as the difference between rocker ratios when the milder cam was used. Apparently the other cam was not letting the engine breathe as much as it wanted, and the extra exhaust lift really helped. Once the more aggressive cam was installed, the engine was breathing at a better level, and the rocker ratio change did not help as much. Compared to the engine with the milder cam and 1.6:1 exhaust rockers, this combination made 15 more HP and 13 less ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job Intake: Holley Contender Camshaft: Crane 272, with 272/284° of duration, 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. of lift. (Corrected valve lift with 1.6:1 exhaust rockers is 0.454/0.512 in.) Rockers: 1.5:1 intake; 1.6:1 exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 326 @ 5500 MAX Torque: 378 @ 3500
Combo 59. Combo 59 uses both 1.5:1 ratios and the milder cam, but the heads are bowl-blended. They are not ported, but the bowls are cleaned up a bit. Compared to the baseline engine in Combo 55, this combo produced 14 more HP and 9 more ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job, bowl-blending, intake gaskets are matched to the intake Intake: Holley Contender Camshaft: Crane 260, with 260/272° of duration, 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. of lift. Rockers: 1.5:1 intake and exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 319 @ 5000 MAX Torque: 390 @ 3500
Combo 60. Combo 60 uses 1.6:1 rockers on the exhaust valves, and this is the only difference from Combo 59. The increased lift produced 4 more HP and 2 more ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job, bowl-blending, intake gaskets are matched to the intake Intake: Holley Contender Camshaft: Crane 260, with 260/272° of duration, 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. of lift. (Corrected valve lift with 1.6:1 exhaust rockers is 0.427/0.484 in.) Rockers: 1.5:1 intake; 1.6:1 exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 323 @ 5000 MAX Torque: 392 @ 3500
Combo 61. Combo 61 goes back to 1.5:1 rockers on the exhausts and uses the more aggressive camshaft. Compared to Combo 59, with the same rockers and the lower-performance cam, Combo 61 makes 24 more HP and the same amount of torque. As expected from the longer duration cam, both the torque and power peaks are 500 rpm higher than with the 260° cam.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job, bowl-blending, intake gaskets are matched to the intake Intake: Holley Contender Camshaft: Crane 272, with 272/284° of duration, 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. of lift. Rockers: 1.5:1 intake and exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 343 @ 5500 MAX Torque: 390 @ 4000
Combo 62. Combo 62 is the last of the combinations with this engine. 1.6:1 exhaust rockers, the 272° cam, and bowl-blended heads are used. This combination produces 349 HP and 390 ft-lbs of torque.		Displacement: 355 cu. in. Carburetor: Holley 650 double pumper Heads: Dart SR, with 1.94/1.50 in. valves, 4-angle valve job, bowl-blending, intake gaskets are matched to the intake Intake: Holley Contender Camshaft: Crane 272, with 272/284° of duration, 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. of lift. (Corrected valve lift with 1.6:1 exhaust rockers is 0.454/0.512 in.) Rockers: 1.5:1 intake; 1.6:1 exhaust Headers: Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers Pistons: Summit cast Rods: Summit Crank: Summit cast Distributor: MSD Comp. Ratio: 9.0:1 MAX HP: 349 @ 5500 MAX Torque: 390 @ 3500

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