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11688H-1 2.205" X 5.200" Intake Manley Severe Duty Valves Fits: Chevy LS7

11688H-1 2.205" X 5.200" Intake Manley Severe Duty Valves Fits: Chevy LS7
NOTE: Photo is a general representation and NOT the actual product listed
  
These valves are priced EACH. Please choose the appropriate amount for your application.
GoRacingValves Price: $82.64


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Description
 
Manley Severe Duty Valves

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 dominance over all others. Ultimate tensile strength of XH-428 at 1500 degrees is nearly double the competitors' EV-8. At 1000 degrees the Manley NK-844 displays more than four times the ultimate tensile strength of the competitors' best intake material. Further proof of the superiority of the Manley Severe Duty valves is evident in Manley's fatigue tests. In normal operation where valve float is non-existant, a valve will experience 20,000 to 25,000 pounds of applied stress. Hoever, when valves bounce on the seat the stress immediately soars to 40,000 plus lbs. Manley exhaust valves ran to 100 million cycles while competitors' offerings failed at 100 thousand cycles. That's a thousand times BETTER fatigue life! Severe Duty Series valves are made from Superior Stainless for high temperature gasoline engines, feature Chrome Stems, Hard Tips, Swirl Polished Heads, and are fully machined. These valves also feature Manley's "Pro Flo" shape with an undercut stem area below the guide and just above the head of the valve. This shape in testing can provide up to a 40% flow increase in small port OE style cylinder heads.

Manley Hollow Stem Valves feature all the benefits of a lightweight valve without going to titanium alloys. These valves feature hollow stems and are approximately 10g lighter than a solid stem valve. The reduced weight is easier on valve springs, allows higher rpm, and extends overall valvetrain life.

APPLICATION(S):
CHEVROLET
LS Series V8







MANUFACTURER:  Manley

PART NUMBER:  11688H-1

INTAKE/EXHAUST:  Intake

HEAD DIAMETER:  2.205"

STEM DIAMETER:  8 mm

OVERALL LENGTH:  5.200"

TIP LENGTH:  .300"

MARGIN: .070"

SEAT WIDTH: .150"

STYLE:  Pro Flo Stem -12� X 3/8" angle/radius- 7� Dish Top of Head-Stock Length

TECH NOTES:  Hollow Stem Valve. Fits LS7 Heads

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