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Mitsubishi Evo 4-8 Supertech Dual Spring & Retainer Kit  347.03 
Ex Tax of 20% 

Overview

Valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for higher performance & durability at high rpms and better memory.
Computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions.Computer software also allows us to make sure that the harmonics arewell under control.
The Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure a long durability.

Specification

 

Part Number

SPRK-M1007S

SPRK-M1005D SPRK-M1007D SPRK-M1007D-2 SPRK-M1007D-3
Engine Type 4G63 4G63 4G63 4G63 4G63
Outer Spring Diameter

28.10mm OD
20mm ID

28.10mm OD
20mm ID
28.10mm OD
20mm ID
28.10mm OD
20mm ID
28.10mm OD
20mm ID
Inner Spring Diameter

SINGLE

20mm OD
15.2mm ID
20mm OD
15.20mm ID
20mm OD
15.20mm ID
20mm OD
15.20mm ID
Spring Pressures (lbs@mm)

Seat - 76 @ 39.6
Open - 200 @ 11.5

Seat - 80 @ 39.6
Open - 200 @ 11.5

Seat - 92 @ 39.6
Open - 235 @ 11.5

Seat - 100 @ 39
Open - 243 @ 11.5
Seat - 110 @ 38.1
Open - 253 @ 11.5

Spring Coil Bind

24.7mm 23.5mm 24.7mm 24.7mm 24.7mm
Spring Max Net Lift

14.9mm

16mm 14.9mm 14.3mm 13.4mm
Spring Rate lbs/mm

10.5mm

10.5mm 12.5mm 12.5mm 12.5mm
Kit Includes:
  • Springs
  • *Use OE Seats*
  • Titanium Retainers
  • Springs
  • Seats
  • Titanium Retainers
  • Stem Seals *
  • Springs
  • Seats
  • Titanium Retainers
  • Stem Seals *
  • Springs
  • Seats
  • Titanium Retainers
  • Stem Seals *
  • Springs
  • Seats
  • Titanium Retainers
  • Stem Seals *

* Some 1st Gen castings may need to use a different seat locator due to a taller valve guide boss. Please advise which is required when ordering.

Available Options:
Evo Spring kit options:
SPRK-M1007S 
SPRK-M1005D (+120.10) 
SPRK-M1007D (+120.10) 
SPRK-M1007D-2 (+120.10) 
SPRK-M1007D-3 (+120.10) 
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