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RACE MASTER VALVES / EXTREME DUTY VALVES - learn more about our valves
Manley valves have set the standard for excellence in quality, material and design in the performance world for four decades. Manufactured from our proven Race Master and XtremeAlloy materials providing the ultimate in strength and durability. Manley valves feature chrome stems, hard tips, fully machined surfaces and swirl polished radii. The intakes utilize our Race Master material and are designed for maximum air flow. The Extreme Duty exhausts are made from our top of the line XtremeAlloy exhaust material, the best in the market making it ideally suited for forced induction and nitrous applications.
Part No. Type Head Diameter Stem Diameter Installed Height O/A Length Tip Length Underhead Angle/Radius Margin Seat Width Top of Head Wgt/Grams
  RACE MASTER VALVES w/ TRIPLE GROOVE
11623-8 Exh. 31mm .2345 Stock 4.274 .305 30° x 11/32" .050 .080 25° Dish 44
11625-8 Exh. 31.5 mm .2345 Stock 4.274 .305 30° x 11/32" .050 .080 25° Dish 45
11627-8 Exh. 32 mm .2345 Stock 4.274 .305 30° x 11/32" .050 .080 25° Dish 46
  EXTREME DUTY VALVES w/ TRIPLE GROOVE
12623-8 Exh. 31mm .2345 Stock 4.274 .305 25° x 11/32" .050 .080 20° Dish 46
12625-8 Exh. 31.5 mm .2345 Stock 4.274 .305 25° x 11/32" .050 .080 20° Dish 47
12627-8 Exh. 32 mm .2345 Stock 4.274 .305 25° x 11/32" .050 .080 20° Dish 48
  RACE MASTER VALVES w/ TRIPLE GROOVE
11622-8* Int. 37mm .2355 Stock 4.722 .365 10° x 5/16" .045 .080 5° Dish 54
11624-8* Int. 37.5mm .2355 Stock 4.722 .365 10° x 5/16" .045 .080 5° Dish 55
11626-8* Int. 38mm .2355 Stock 4.722 .365 10° x 5/16" .045 .080 5° Dish 56
  RACE MASTER VALVES w/ BEAD LOCŪ GROOVE
11623B-8 Exh. 31mm .2345 Stock 4.274 .320 30° x 11/32" .050 .080 25° Dish 44
11625B-8 Exh. 31.5 mm .2345 Stock 4.274 .320 30° x 11/32" .050 .080 25° Dish 45
11627B-8 Exh. 32 mm .2345 Stock 4.274 .320 30° x 11/32" .050 .080 25° Dish 46
  EXTREME DUTY VALVES w/ BEAD LOCŪ GROOVE
12623B-8 Exh. 31mm .2345 Stock 4.274 .320 25° x 11/32" .050 .080 20° Dish 46
12625B-8 Exh. 31.5 mm .2345 Stock 4.274 .320 25° x 11/32" .050 .080 20° Dish 47
12627B-8 Exh. 32 mm .2345 Stock 4.274 .320 25° x 11/32" .050 .080 20° Dish 48
  RACE MASTER VALVES w/ BEAD LOCŪ GROOVE
11622B-8* Int. 37mm .2355 Stock 4.722 .380 10° x 5/16" .045 .080 5° Dish 54
11624B-8* Int. 37.5mm .2355 Stock 4.722 .380 10° x 5/16" .045 .080 5° Dish 55
11626B-8* Int. 38mm .2355 Stock 4.722 .380 10° x 5/16" .045 .080 5° Dish 56
* Intakes have backcut - .050" x 30°
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