Camshaft Specifications
ManufacturerComp Cams
Part Number12-419-8
TypeHydraulic roller
Valve lift at 0.0500.520/0.540-inch intake/exhaust
w/1.6 rockers0.555/0.578-inch intake/exhaust
Duration at 0.050236 degrees/248 degrees intake/exhaust
Intake centerline108 degrees
Lobe separation113 degrees
Dyno Details
Headers23/4 Long tubes
Advance36 degrees
Fuel91-octane unleaded
Max torque at rpm470.7 at 4,300
Max power at rpm458.0 at 5,700
Average torque 447.9
Average power390.0
Nitrous Works Plate125-Shot
Advance31 degrees
Max torque at rpm641.2 at 4,500
Max power at rpm593.0 at 5,600
Average torque515.1
Average power455
Engine Balance
Rod (rotating)434.8 g
Rod insert46 g
Oil allowance4 g
Piston (w/ pin)535.2 g
Rings35.3 g
Rod (reciprocating)178.5 g
Total rotating965.6 g
Total reciprocating749 g
Total bob-weight1714.6 g
385ci Buildsheet
Specifications not listed are the same as stock. Except as noted, all dimensions are in inches or fractions thereof. All prices sourced through Speed-O-Motive.
Displacement384.6 ci
Bore x Stroke4.040 x 3.750
Compression10.30:1
Rod center-to-center6.000
Piston deck height+0.006
Chamber volume72cc
Rod-bearing clearance0.0020
Crank endplay0.0060
Piston-ring endgap0.020 top; 0.022 second
Main bearing-cap torque65-70 lb-ft (moly-lube)
Rod-bolt torque50 lb-ft (moly-lube)
Head-bolt torque70 lb-ft (moly-lube)
MOTOR ONLY
RPM Lb-FtHP
3,100451.1266
3,200448.3273
3,300446280
3,400446.9289
3,500449.5300
3,600453310
3,700457.9323
3,800461.1334
3,900463.8344
4,000466.2355
4,100469.2366
4,200469.8376
4,300470.7385
4,400469.8394
4,500468.8402
4,600467.6410
4,700465.3416
4,800462.5423
4,900461.8431
5,000457.7436
5,100455442
5,200449.1445
5,300442.7447
5,400439.7452
5,500432.8453
5,600426.6455
5,700421.6458
5,800414.7458
5,900406456
6,000399.5456
6,100391.3455
W/NITROUS
RPM lb-ftHp
3,100431.8255
3,200429.3262
3,300429.1270
3,400430.5279
3,500432.3288
3,600437.4300
3,700445.6314
3,800443.3321
3,900443.4329
4,000444.5339
4,100450.8352
4,200450.9361
4,300466.7382
4,400486.9408
4,500641.2549
4,600635.6557
4,700627.2561
4,800619.8566
4,900611.6571
5,000605.3576
5,100595.6578
5,200590584
5,300582.9588
5,400574.4591
5,500564.2591
5,600556.5593
5,700546.8593
5,800535.1591
5,900525.4590
6,000513.2586
6,100501.1582