| قائمة الموقع |
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| بالأرقام.... |
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عدد صور الموقع: 2889
عدد أقسام الموقع: 109
عدد الـVotes الكلي: 7652
عدد التعليقات الكلي: 11
عدد الـHits الكلي: 2225459
عدد مرات التحميل: 445488
المتواجدين حاليا: 16
عدد الزوار الكلي:
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| أختر لغتك المفضلة |
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| الإعلانات |
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55-57 combo |
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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. |
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Displacement: |
355 cu. in. |
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Carburetor: |
Holley 650 double pumper |
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Heads: |
Dart SR, with 1.94/1.50 in. valves, 4-angle valve job |
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Intake: |
Holley Contender |
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Camshaft: |
Crane 260, with 260/272° of duration, 204/216° of duration @ 0.050 in. lift, and 0.427/0.454 in. of lift |
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Rockers: |
1.5:1 intake and exhaust |
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Headers: |
Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers |
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Pistons: |
Summit cast |
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Rods: |
Summit |
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Crank: |
Summit cast |
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Distributor: |
MSD |
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Comp. Ratio: |
9.0:1 |
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MAX HP: |
305 @ 5000 |
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MAX Torque: |
381 @ 3500 |
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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. |
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Displacement: |
355 cu. in. |
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Carburetor: |
Holley 650 double pumper |
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Heads: |
Dart SR, with 1.94/1.50 in. valves, 4-angle valve job |
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Intake: |
Holley Contender |
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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.) |
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Rockers: |
1.5:1 intake; 1.6:1 exhaust |
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Headers: |
Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers |
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Pistons: |
Summit cast |
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Rods: |
Summit |
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Crank: |
Summit cast |
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Distributor: |
MSD |
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Comp. Ratio: |
9.0:1 |
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MAX HP: |
311 @ 5000 |
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MAX Torque: |
391 @ 3500 |
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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. |
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Displacement: |
355 cu. in. |
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Carburetor: |
Holley 650 double pumper |
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Heads: |
Dart SR, with 1.94/1.50 in. valves, 4-angle valve job |
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Intake: |
Holley Contender |
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Camshaft: |
Crane 272, with 272/284° of duration, 216/228° of duration @ 0.050 in. lift, and 0.454/0.480 in. of lift. |
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Rockers: |
1.5:1 intake and exhaust |
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Headers: |
Hedman 1 5/8 in. headers with Flowmaster dual-crossflow mufflers |
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Pistons: |
Summit cast |
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Rods: |
Summit |
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Crank: |
Summit cast |
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Distributor: |
MSD |
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Comp. Ratio: |
9.0:1 |
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MAX HP: |
322 @ 5500 |
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MAX Torque: |
376 @ 3500 |
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