Camshafts Roller Lifter

 

Company

Part #

Type
Solid/
Hydro

Grind #

Lift Intake

Lift Exhaust

Advertised Duration
RPM Range  Compression
Ratio

Usage

Comp Cams
32-411-8
HYDRO
260HR
.510
.510
260 I/E
1200 to 4500
(not specified)
Best with stock engine for economy or towing. Can be used with stock gears and converter. Smooth idle.
Comp Cams
32-421-8
HYDRO
270HR
.566
.566
270 I/E
1800 to 5000
(not specified)
Mild street performance. lightly noticeable lope at idle. Will work with
stock converter or even better with 1800+ stall & gear upgrade.
Comp Cams
32-431-8
HYDRO
284HR
.566
.566
284 I/E
2000 to 5500
(not specified)
Great in street machines. Best above 3500+ rpm.Good torque. Largest cam with stock heads and intake. 2000+ stall.
Comp Cams
32-541-8
HYDRO
290HR
.578
.578
290 I/E
2500 to 6000
(not specified)
Perfect for street machine. Best with 4 speed and 3.40-4.10gears. Aftermarket intake, headers and mild converter. 2500+ converter.
Comp Cams
32-651-8
HYDRO
304HR
.612
.612
304 I/E
3000 to 6500
(not specified)
Street/strip only. 4 speed or 3000+ stall and 4.10 or lower gear. Higher compression, after market intake
and headers.
Comp Cams
32-771-9
MECH  288R
.623
.623
288 I/E
2500 to 6500
(not specified)
Excellent power for serious street use. 3000+ stall with low
gear and headers. Rough idle.
Comp Cams
32-772-9
MECH
308R
.651
.651
308 I/E
3000 to 7000
(not specified)
Ultimate Pro Street cam. 4000+ stall or 4 speed 11:1 compression, radical race idle.
Isky Cams 431640 MECH
RR-640 .640 .640 304 I/E 3200-6800 11-12:1 Good cam for 3500LB bracket racing “drags”. 3000 stall. 4.56-4.88 axle ratio. Up to 800 CFM Carb.
Isky Cams 431650 MECH
RR-650 .650 .650 318 I/E 3500-7200 11-12:1 Good all around perf. for bracket racing. 4000-4500 stall. 4.88-5.13 axle ratio. 850+Carb.
Isky Cams 431686 MECH
RR-686 .686 .686 320 I/E 4500-8000 “high compr” Good all-around perf. in super-gas & super comp. 5000 stall. 5.38-5.86 axle ratio. 850+CFM.
Isky Cams 431730 MECH
RR-730 .730 .730 314 I/E 3800-7500 “high compr” Super Gas, Super Comp: 5000 stall. 4.88 axle ratio. Tunnel Ram Intake with 2 carburetors.
Isky Cams 431727 MECH
RR-727 .727 .727 330 I/E 4500-8500 “high compr” Good all-around perf. in super-gas & super comp. 5000 stall. 5.38-5.86 axle ratio. 850+CFM.
Isky Cams 431749 MECH RR-747-C .747 .730 318 I320 E 4200-8400 “high compr” Comp. eliminator, super-comp drags. 5000+stall. 5.86-6.14axle ratio. Tunnel ram manifold with 2 carbs.
Isky Cams 431750 MECH
RR-747-D .747 .730 320 I322 E 4400-8800 “high compr” Comp. eliminator, super-comp drags. 5000+stall. 5.86-6.14axle ratio. Tunnel ram manifold with 2 carbs.

 

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.Isky Cams started stating high compr for recommended compression ratios after 12:1. Assume 1-2 points higher than 12:1. But if in doubt for the proper compression ratio ask one of the knowledgeable people on the message board.

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