Camshafts Mechanical Lifter

George Pence’s Cobra Jet Camshaft Chart

 

 

Company Part # Grind # Lift Intake Lift Exhaust Advertised Duration
RPM Range Compression
Ratio
Usage
Comp Cams
32-237-4
270S
.540
.540
270 I/E
1800 to 5800
9:1
Excellent torque. Everyday performance. 2000+ converter. Noticeable idle.
Comp Cams
32-238-4
282S
.570
.570
282 I/E
2000 to 6000
9:1
Street machine with headers, 2500+ converter. Great mid-range power. Mild rough idle.
Comp Cams
32-239-4
294S
.605
.605
294 I/E
2500 to 6500
10:1
Street/strip, 3000+ stall, low gear. Rough idle. Great mid-range and top end.
Comp Cams
32-240-4
306S
.640
.640
306 I/E
3000 to 7000
11:1
Pro Street/bracket race. Excellent top end, 3500+ stall. Radical idle.
Comp Cams
32-638-5
284B-8
.564
.589
284 I / 294 E
3200 to 6200
10:1
Best in large c.i. street machine. 3500+ stall, 4.10 gear.
Comp Cams
32-644-5
294B-6
.589
.615
294 I / 304 E
3800 to 6800
10.5:1
Excellent torque for heavy cars, 3500+ stall or 4 speed.
Comp Cams
32-642-5
285B-6
.614
.645
285 I / 295 E
3500 to 6500
(not specified)
Best for 1/4-3/8 mile track, broad torque range.
Isky Cams
431584
584
.584
.588
282 I / 288 E
2600-6800
(not specified)
Banked 1/4-3/8 mile oval tracks. Any carburetor.
Isky Cams
431360
FL-360
.530
.530
278 I/E
2500-6500
11.5:1
Strong mid-range perf. Lopey idle. 2500 RPM stall. 3.70-
4.11 axle ratio. 650-750 CFM Carb.
Isky Cams 431380
FL-380
.560
.560
290 I/E
3000-7000
11.5:1
High perf. Use/bracket racing. Lopey idle.
3000 stall. 3.90-4.11 axle ratio.
Up to 800 CFM Carb.
Isky Cams 431570
FL-570
.644
.644
312 I/E
4000-8000
11:1
All-out competition/drags. Rough idle. 4500 stall. 4.88-
5.38 axle ratio. 850 CFM Carb.
Isky Cams 431670
FL-670
.682
.682
330 I/E
5000-8500
12:1
All out competition/drags. 5000 stall. 5.13-5.57 axle ratio.
850+CFM Carb.

 

If compression ratio says not specified, manufacture didn’t provide specs. You can assume a stock to 1/2-1 point difference, there are always exceptions unfortunately. If you are unsure about anything listed here, ask someone on the message board, they are more than happy to help.

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