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 Dia
      Stem Dia
      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-1 / LS-2 (LS-6 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
    

PRO FLO SEVERE DUTY VALVES / EXTREME DUTY 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"	0.050"	.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"	0.050"	.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"	0.050"	.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

  
      Part No.
      Type
      Head Diam.
      Stem Diameter
      Installed Height
      O / A Length
      Tip Length
      Underhead Angle / Radius
      Margin
      Seat Width
      Top of Head
      Wgt / Grams
    
      11361-8
      Exh.
      1.550
      0.3136
      Stock
      4.923
      0.175
      25° x 7/16"
      0.065
      0.115
      18° Dish
      87
    
      11363-8
      Exh.
      1.575
      0.3136
      Stock
      4.923
      0.175
      25° x 7/16"
      0.065
      0.115
      18° Dish
      89
    
      11365-8
      Exh.
      1.600
      0.3136
      Stock
      4.923
      0.175
      25° x 7/16"
      0.065
      0.115
      18° Dish
      91
    
      11360-8
      Int.
      2.000
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      103
    
      11360H-8
      Int.
      2.000
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      91
    
      Hollow Stem
      
      11362-8
      Int.
      2.020
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      105
    
      11362H-8
      Int.
      2.020
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      93
    
      Hollow Stem
      
      11390-8
      Int.
      2.055
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      106
    
      11390H-8
      Int.
      2.055
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      94
    
      Hollow Stem
      
      11398-8
      Int.
      2.080
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      107
    
      11398H-8
      Int.
      2.080
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      95
    
      Hollow Stem
      
      11350-8
      Int.
      2.100
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      109
    
      11350H-8
      Int.
      2.100
      0.3133
      Stock
      4.874
      0.175
      Pro Flo: 12° x 3/8"
      0.050
      0.095
      7° Dish
      97
    
      Hollow Stem