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RACE SERIES 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 proven Race Master materials, Manley valves feature chrome stems, hard tips, fully machined surfaces and swirl polished radii. Many applications are Pro Flow design for maximum air flow.
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
  LS-1 / LS-2 (LS-6 Head) Small Block Chevy
11361-8 Exh. 1.550" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 87
11363-8 Exh. 1.575" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 89
11365-8 Exh. 1.600" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 91
11360-8 Int. 2.000" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 103
11360H-8 Int. 2.000" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 91
11362-8 Int. 2.020" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 105
11362H-8 Int. 2.020" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 93
11390-8 Int. 2.055" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 106
11390H-8 Int. 2.055" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 94
11398-8 Int. 2.080" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 107
11398H-8 Int. 2.080" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 95
11350-8 Int. 2.100" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 109
11350H-8 Int. 2.100" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 97
  LS-3 / L-99 (L-92 Head) Small Block Chevy
11621-8 Exh. 1.590" .3136" Stock 4.923" .160" 25° x 7/16" .070" .115" 18° Dish 92
11620-8 Int. 2.165" .3133" Stock 4.900" .160" Pro Flo: 12° x 3/8" .055" .100" 7° Dish 119
11620H-8 Int. 2.165" .3133" Stock 4.900" .160" Pro Flo: 12° x 3/8" .055" .100" 7° Dish 107
  H suffix indicates hollow stem

PRO FLO SEVERE DUTY 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 Severe Duty 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 Severe Duty material, the best available, and are the Pro Flo design 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
  LS-1 / LS-2 (LS-6 Head) Small Block Chevy - Severe Duty
11673-8 Exh. 1.550" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 88
11675-8 Exh. 1.575" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 90
11677-8 Exh. 1.600" .3136" Stock 4.923" .175" 25° x 7/16" .065" .115" 18° Dish 92
11680-8 Int. 2.055" .3133" Stock 4.874" .175" Pro Flo:12° X 3/8" .050" .095" 7° Dish 107
11680H-8 Int. 2.055" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 95
11682-8 Int. 2.080" .3133" Stock 4.874" .175" Pro Flo:12° X 3/8" .050" .095" 7° Dish 108
11682H-8 Int. 2.080" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 96
11684-8 Int. 2.100" .3133" Stock 4.874" .175" Pro Flo:12° X 3/8" .050" .095" 7° Dish 110
11684H-8 Int. 2.100" .3133" Stock 4.874" .175" Pro Flo: 12° x 3/8" .050" .095" 7° Dish 98
  LS-1 / LS-2 (LS-6 Head) Small Block Chevy - Extreme Duty
11681-8 Exh. 1.575" .3136" Stock 4.923" .175" 25° X 7/16" .065" .115" 18° Dish 90
11683-8 Exh. 1.600" .3136" Stock 4.923" .175" 25° X 7/16" .065" .115" 18° Dish 92
  LS-3/L-99 (L-92 Head) Small Block Chevy - Severe Duty
11661-8 Exh. 1.590" .3136" Stock 4.923" .160" 25° x 7/16" .070" .115" 18° Dish 94
11686-8 Int. 2.165" .3133" Stock 4.900" .160" Pro Flo:12° X 3/8" .055" .100" 7° Dish 118
11686H-8 Int. 2.165" .3133" Stock 4.900" .160" Pro Flo:12° X 3/8" .055" .100" 7° Dish 109
  LS-3/L-99 (L-92 Head) Small Block Chevy - Extreme Duty
11685-8 Exh. 1.590" .3136" Stock 4.923" .160" 25° X 7/16" .070" .115" 18° Dish 93
  LS-7 Small Block Chevy - Severe Duty
11679-8 Exh. 1.610" .3136" Stock 5.230" .290" 25° x 7/16" .075" .100" 18° Dish 103
11688-8 Int. 2.205" .3133" Stock 5.200" .300" Pro Flo: 12° x 3/8" .050" .085" 7° Dish 120
11688H-8 Int. 2.205" .3133" Stock 5.200" .300" Pro Flo: 12° x 3/8" .050" .085" 7° Dish 110
  LS-7 Small Block Chevy - Extreme Duty
11687-8 Exh. 1.610" .3136" Stock 5.230" .290" 25° X 7/16" .075" .100" 18° Dish 103
  H suffix indicates hollow stem
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