Manley 11135-8 BBC Exhaust SS Severe Duty Valve 3-8 Stem 31.5 mm Head Dia. x 6.54 mm/.2575” Stem Dia. Installed HeightType: Exhaust
Head Dia.: 31.5 mm
Stem Dia.: 6.54 mm/.2575”
Installed Height:
Length: 109.7 mm
Tip Length: 3.8 mm
Underhead Angle/Radius: Pro Flo: 22° x 7/16"
Margin: .065"
Seat Width: .080"
Top of Head: 17° Dish
XH-426 Stainless Exhaust Material
NK-842 Stainless Intake Material
Chrome Stems and Hard Tips
Swirl Polished and Fully Machined
Improved flow with “Pro Flo” Underheads
MITSUBISHI ECLIPSE GS, GST 2.0L - DOHC 16 VALVE ( 4G63-4G63T ) 1990 - 2000
The Severe Duty series of valves is the Manley signature in the
performance and racing industry. Exhaust material XH-428 and intake
material NK-844 is offered by no competitor in the world. And no pair
of materials show such clear and demonstratable dominance over all
others. Ultimate tensile strength of XH-428 at 1500°F is nearly
double the competitor's EV-8. At 1000°F the Manley NK-844 displays
more than four times the ultimate tensile of the competition’s best
intake material.
In addition to the vastly superior strength and fatigue
characteristics of Manley NK-844, our exclusive intake material
exhibits an uncanny ability to resist chordal fractures. In an
excellent sealing combustion chamber, the intake valve is actually
deformed by the fuel explosion and pushed up into the port. The
effect of this continuous deformation on competitors’ material
eventually is a chordal fracture propagating from the circumference
of the valve and quickly becoming a missing pie shaped piece. Manley
NK-844 is the absolute best choice of material to comb at disastrous
chordal fractures.
Further proof of the superiority of the
Manley Severe Duty valves is evident in our comprehensive fatigue
tests. In normal operation where valve float is nonexistent,a valve
will experience 20,000 to 25,000 lbs of applied stress. However, when
valves bounce on the seat the stress immediately soars to 40,000 to
60,000 lbs. Manley exhaust valves ( at 40,000 psi and 1400°F ) ran
to100,000,000 ( one hundred million ) cycles while competitor's
offerings failed at 100,000 cycles. That’s 1000 times better
fatigue life.
Manley
Performance is universally acknowledged as the leading manufacturer
of performance and racing valves in the world.
The reason for
Manley’s overwhelming success is simple: QUALITY. We offer the best
materials in the industry - exclusive materials our competitors do
not possess. Our stems are hard coated with .0002" thick chrome
rather than a few millionths of flash. Our hard tips are superior to
competitors’ puddled stellite which can crack and erode off the
stem. Our valve head and under head shapes have been in the forefront
of the quest for improved flow since the late 1960’s. And always
each Manley valve has been price targeted to specific markets to
ensure the best possible value to the customer.
Set of 8 Valves
This product was added to our catalog on Wednesday 20 April, 2011.