In GM 4L30-E, AR25 and AR35 units, the OE boost valves are made of steel, whereas the sleeves are made out of aluminum. Over time the valve wears against the sleeve and causes boost pressure leakage. The result is low line pressure during boost, with associated burnt clutches. Sonnax boost valve kit 54200-06K restores pressure control to the boost circuit.

Sleeve is made from wear-resistant aluminum and incorporates annular oil passages to distribute boost oil evenly to the valve and reduce side loading
Hardcoat anodized aluminum valve combats premature wear
Valve includes oil grooves which allows the valve to ride on a film of oil, further reducing wear
Valve and sleeve are made from the same material to help reduce leakage due to thermal expansion
Drop-in Zip Valve™ parts install quickly and easily


Sonnax Part No.
Boost Ratio
Sonnax I.D. Mark
OE/Euro I.D. Mark
Large Spool Diameter
Small Spool Diameter


54200-14K
Small to Medium
067
067
.634"
.570"

54200-01K
Medium
M
448
.662"
.630"

54200-06K
Large
L
264
.697"
.649"


Learn More About Zip Valve™ Drop-In Repairs

More From This Category

MILODON Valves, Exhaust, Stainless Steel, 1.725 in. Diameter, For Chevrolet, Big Block, 396, 427, 454, 502, Set of 8

MILODON Valves, Exhaust, Stainless Steel, 1.725 in. Diameter, For Chevrolet, Big Block, 396, 427, 454, 502, Set of 8

$392.22

MANLEY Valve, Race Flo, Intake, Bead Loc, 2.02 in. Head Dia, 0.3125 in. Stem Dia, 4.955 in. Length, For Chrysler HEMI, Each

MANLEY Valve, Race Flo, Intake, Bead Loc, 2.02 in. Head Dia, 0.3125 in. Stem Dia, 4.955 in. Length, For Chrysler HEMI, Each

$142.29

MANLEY Valve, Race Flo, Exhaust, 30.5 mm Head Dia, 6.54 mm Stem Dia, 109.7 mm Length, For Mitsubishi, Set of 8

MANLEY Valve, Race Flo, Exhaust, 30.5 mm Head Dia, 6.54 mm Stem Dia, 109.7 mm Length, For Mitsubishi, Set of 8

$399.33

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 6.09 in. Length, Each

MANLEY Valve, Titanium, Exhaust, Bead Loc, 1.6 in. Head Dia, 0.3415 in. Stem Dia, 6.09 in. Length, Each

$320.57

MANLEY Valve, Race Series, Exhaust, 1.65 in. Head Dia, 0.3415 in. Stem Dia, 5.64 in. Length, Gen II, Each

MANLEY Valve, Race Series, Exhaust, 1.65 in. Head Dia, 0.3415 in. Stem Dia, 5.64 in. Length, Gen II, Each

$70.15