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The New Red Zone™ Roller Lifters

Red Zone™ Roller Lifters feature the new Marathon™ Roller Bearing -- the bearing that keeps on rolling longer! Marathon™ bearings utilize a larger diameter pin and a shock absorbing, thicker outer race for higher fracture toughness! The resulting increased cross sectional area helps prevent premature bearing failures even under the sustained RPM red line abuse of professional endurance racing. In drag racing, Marathon™ bearings withstand higher (up to 1/2 ton) spring loads, delivering over twice the number of runs between rebuilds!

Test Proven Red Zone™ Safe! Marathon™ bearings routinely log back to back 1,000 racing mile endurance runs via the most rigorous, real-world test standard ever created, Spintron Test II. It's a no holds barred run as high as 9,000 RPM, where face ending competitive abuse is continuously revisisted!




Application Part No. Dia. Body Type
Pushrod
Isky
Pushrod
Length RevKit
SMALL BLOCK
CHEVY V-8
272-RH .842" STEEL "B"
(centerline)
203-HG
(std. length)
7.781" 210-LRK
310-LRK
272-RHM-904 .903" STEEL "A"
(Centerline)
Liteweight Version
203-HG
Series
  N/A
272-LO-180 .842" STEEL "A"
(8-Centerline)
(4 ea. .180" left & right offset)
203-HG
(std. length)
7.781" N/A
272-LO-180/874 .874" STEEL "A"
(8-Centerline)
(4 ea. .180" left & right offset)
203-HG
(std. length)
7.781" N/A
272-180-904 .903" STEEL "A"
(8-Centerline)
(4 ea. .180" left & right offset)
203-HG
Series
  N/A
372-LO-180
(extra tall version to fit into
both early and late bow-tie
blocks with raised lifter bosses)
.842" STEEL "A"
(8-centerline)
(4-.180" left & right offset)
203-HG
(std. length)
7.781" N/A
372-180-904
(extra tall version to fit into
both early and late bow-tie
blocks with raised lifter bosses)
.903" STEEL "A"
(8-centerline)
(4-.180" left & right offset)
203-HG
Series
  N/A
372-LO180874
(extra tall version to fit into
both early and late bow-tie
blocks with raised lifter bosses)
.874" STEEL "A"
(8-centerline)
(4-.180" left & right offset)
203-HG
(std. length)
7.781" N/A
1271-LSH .842" ALUMINUM TOP
"C" (centerline)
1235-L 6.500" 200-LRK
300-LRK
1271-LSH/874 .874" ALUMINUM TOP
"C" (centerline)
1235-L 6.500" 200-LRK
300-LRK
1271-LO-150 .842" ALUMINUM TOP
"C" (8-centerline)
(4-.150" left & right offset)
1235-L 6.500" 150-LRK
1271-LO-185 .842" ALUMINUM TOP
"C" (8-centerline)
(4-.185" left & right offset)
1235-L 6.500" 150-LRK
1271-LO150874 .874" ALUMINUM TOP
"C" (8-centerline)
(4-.150" left offset)
(4-.150" right offset)
1235-L 6.500" 150-LRK
1371-LSH
(extra tall version to fit into
late bow-tie blocks with
raised lifter bosses)
.842" ALUMINUM TOP
"C" (centerline)
1235-L 6.500" 1300-LRK
1371-LO-150
(extra tall version to fit into
late bow-tie blocks with
raised lifter bosses)
.842" ALUMINUM TOP
"C" (8-centerline)
(4 ea. .150" left & right offset)
1235-L 6.500" 1350-LRK
BIG BLOCK
CHEVY V-8
272-96-RH .842" STEEL "B"
(centerline)
203-96
(std. length)
8.281" int.
9.250" ex.
N/A
276-RHM-904 .903" STEEL "A"
(centerline)
Liteweight Version
203-96
Series
  N/A
272-96-LO-180 .842" STEEL "A"
(8-centerline)
(4 ea. .180" left & right offset)
203-96
(std. length)
8.281" int
9.250" ex
N/A
276-180-904 .903" STEEL "A"
(8-centerline)
(4 ea. .180" left & right offset)
203-96
Series
  N/A
372-96-RH
(.350" taller than 272-96-RH
to fit intobow-tie blocks
with raised lifter bosses)
.842" STEEL "B"
(centerline)
203-96
(std. length)
8.281"int.
9.250"ex.
N/A
376-RHM-904
(extra tall version
to fit late bow-tie blocks
with raised lifter bosses)
.842" STEEL "A"
(centerline)
Liteweight Version
203-96
Series
  N/A
376-180-904
(extra tall version
to fit late bow-tie blocks
with raised lifter bosses)
.903" STEEL "A"
(8-centerline)
(4 ea. .180" left & right offset)
203-96
Series
  N/A
FORD V-8
351 SVO,
289/302
BOSS 302
3972-RH .874" STEEL "A"
(centerline)
lightweight version
-- Std. Length N/A
4372-RH .874" STEEL "B"
(centerline)
-- Std. Length N/A
FORD V-8
429-460
cu. in.
3172-RH .874" STEEL "A"
(centerline)
lightweight version
-- Std. Length N/A

BODY TYPE ROLLER LIFTER INTERCHANGE CHART

NEW ISKY RED ZONE™
ROLLER LIFTERS

ORIGINAL VERSION ISKY
ENDURANCE PLUS
ROLLER LIFTERS
272-RH 202-RH
272-96-RH 202-96-RH
372-LO180 202-LO180 & 302-LO180
372-LO180874 202-LO180874 & 302-LO180874
372-96-RH 302-96-RH
372-96-LO180 202-96-LO180 & 302-96-LO180
1271-LSH 1241-LSH
1271-LSH/874 1241-LSH/874
1271-LO150 1241-LO150
1271-LO150/874 1241-L0150/874
3872-RH 382-RH
4372-RH 432-RH

Part
No.
Style Outer
OD/ID
Inner
OD/ID
Seat
Pressure
Open
Pressure
Rate
per
Inch
Coil
Blind
Max.
Net Lift
Type of
Cam
295-D  Single
w/Damper
1.260"
.886"
-- 135 lbs
@1.775"
350 lbs
@1.175"
360 1.100" .600" Solid
9905  Dual
w/Damper
1.534"
1.120"
1.010"  
.740"  
165 lbs
@1.900"
450 lbs
@1.300"
475 1.160" .600" Concept Series
Flat Tappet
9915  Dual
w/Damper
1.560"
1.145"
1.040"  
.740"  
195 lbs
@1.975"
540 lbs
@1.275"
500 1.175" .700" "Winston Cup"
Flat Tappet
9925  Dual
w/Damper
1.534"
1.120"
1.010"  
.740"  
170 lbs
@1.975"
450 lbs
@1.350"
470 1.160" .600" Concept Series
Flat Tappet
9935  Dual
Damperless
1.560"
1.155"
1.153"  
.820"  
245 lbs
@1.950"
590 lbs
@1.250"
490 1.150" .700" Roller
9945  Dual
w/Damper
1.625"
1.175"
1.065"  
.770"  
250 lbs
@2.020"
675 lbs
@1.270"
550 1.180" .750" Roller
9955  Dual
w/Damper
1.625"
1.175"
1.065"  
.770"  
265 lbs
@2.120"
700 lbs
@1.320"
545 1.240" .800" Roller
9965  Dual
w/Damper
1.560"
1.145"
1.040"  
.740"  
245 lbs
@1.950"
585 lbs
@1.270"
470 1.170" .680" Roller
9975  Dual
w/Damper
1.560"
1.145"
1.040"  
.740"  
245 lbs
@1.970"
585 lbs
@1.290"
480 1.190" .680" Roller
9985  Dual
w/Damper
1.560"
1.145"
1.040"  
.740"  
245 lbs
@2.000"
585 lbs
@1.300"
500 1.200" .700" Roller
9995  Dual
w/Damper
1.570"
1.145"
1.035"  
.740"  
250 lbs
@2.030"
625 lbs
@1.300"
510 1.200" .730" Roller