Description

Pontiac 400 – 428 – 455 Race Master Exhaust Valves – Set of 12 by Manley Performance

Race Master, and the Pro Flo versions identified as Race Flo valves, are manufactured of XH-426 material for the exhausts and NK-842 for the intakes. This series of valves is targeted at the bracket, drag and oval track racers operating below 8000 rpm – above which engine speed titanium valves are generally required.

Any engine builder successfully using EV-8 alloy ( 21-4N ) valves will find in this series of Manley valves a superior piece at a most attractive price. The Ultimate Tensile Strength charts on this page and the next, show the Manley Race Series to be equal to the best that the competitors have to offer.

Features

• Head Diameter: 1.770″
• Stem Diameter: .3415”
• O/A Length: 5.100″
• Tip Length: .250″
• Underhead Angle/Radius: 25° x 3/8”
• Margin: .080”
• Seat Width: .100”
• Top Of Head: 20° Dish
• Chrome Stems and Hard Tips
• Swirl Polished and Fully Machined
• XH-426 Stainless Exhaust Material

Benefits

• Suits drag and oval track racers operating below 8000 rpm
• Recommended Exhaust Valves for Alcohol Engines

Please Note: The image provided is generic and may not be an accurate representation of the product you will receive.

Applications

• 1977-1981 Pontiac Bonneville
• 1968-1981 Pontiac Firebird
• 1968-1981 Pontiac LeMans
• 1968-1981 Pontiac Parisienne
• 1968-1970 Pontiac Tempest
• 1969 Pontiac Custom S
• 1971-1981 Pontiac Catalina
• 1972-1975 Pontiac Ventura
• 1973-1981 Pontiac Grand Prix
• 1974 Pontiac GTO
• 1978 Pontiac Grand Safari
• 1978-1980 Pontiac Grand Am
• 1978-1981 Buick Century / Regal / LeSabre

What’s In The Box?

• 12 – Valves

Warranty

• Manley products, due to their intended use, are sold without warranty.