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Supertech Performance Valves - High Flow Rates - Less Friction - More Power - Featuring Black Nitrided Treatment! Supertech Extreme Flow Performance Valves for Pro Street and Racing are engineered for High RPM and High HP. Extreme Flow Valves outperform any other valve on the market today, and with their Nitride Coating are perfect for High Temperatures (and run cooler which improves value life), Nitrous, Turbos and Superchargers. For naturally aspirated motors these valves will give you a much greater cylinder flow for good HP gains.   Manufacturing/Description Intake and Exhaust Valves are One Piece Forged, High Temperature, High Nickel, Stainless Steel Alloy. Valves are CNC finished to strict tolerances making these valves the choice for the most demanding race classes.   ----------------------------------------------------------------------------   Three Types of Valves Available: (color coded in TYPE column for easy reference) #1) Black Nitride (Coating): Part # ending in "N" The micro-hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitrided layer (micro-hardness is 800HV minimum). Surface finish is smoother than with chromed stems, having less friction between stem and guide. --- Valve seat surface is harder with the nitrided layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats). --- The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction. The nitrided layer is adhered to the base material at a microscopic level, so does not "flake" or brake when the valves bend due to impacts with the pistons. --- The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem. All valves are swirl polished, have stem undercut and a hardened tip #2) Chrome (special coating used only as noted): Part # ending in "C" Widely used and known in high performance valves Only applied to stem. #3) Inconel (special valve material used only as noted): Part # ending in "I" Inconel 751/Nimonic - These Nickel based alloy materials are used for Exhaust valves in engines that reach very high temperatures and its use is growing with the application of turbos and superchargers.

Item INT or EXH Type (N,C,I) Description Price Per Valve Buy Now Mazda MAEVN-1100 EXH N Mazda Miata 1.6Lts. 26.20x5.94x105.35mm /SS/ Blk. Nitrided/ Stk. size. $16 Qty: MAEVN-1102 EXH N Mazda Miata 1.6Lts. 27.20x5.94x105.35mm /SS/ Blk. Nitrided/ Stk. size/Dish/ 1mm++ $16 Qty: MAIVN-1100 INT N Mazda Miata 1.6Lts. 31x5.96x105.35mm /SS/ Blk. Nitrided/ Stk. size. $16 Qty: MAIVN-1100/2 INT N Mazda Miata 1.6Lts. 31x5.96x105.35mm /SS/ Blk. Nitrided/ Stk. size/ small backcut/ Dish. $16 Qty: MAIVN-1102 INT N Mazda Miata 1.6Lts. 32x5.96x105.35mm /SS/ Blk. Nitrided/undercut/ backcut/ Dish./ ++1mm $16 Qty: MAIVN-1201 INT N Mazda Miata 1.8Lts. 33.00x5.96x101.30mm /SS/ Blk. Nitrided/ Stk. size. $15 Qty: MAIVN-1204 INT N Mazda Miata 1.8Lts. 33.00x5.96x103.1mm /SS/ Blk. Nitrided/Undercut & backcut/ Stk. size./+1.1mm longer $16 Qty: MAIVN-1206 INT N Mazda Miata 1.8Lts. 34.00x5.96x102.60mm /SS/ Blk. Nitrided/ Stk. head/+0.6mm longer/ +1mm head diam. $16 Qty: MAIVN-1208 INT N Mazda Miata 1.8Lts. 33.00x5.96x103.10mm /SS/ Blk. Nitrided/ Stk. head/+1.1mm longer $16 Qty: MAEVN-1201 INT N Mazda Miata 1.8Lts. 28.00x5.94x101.60mm /SS/ Blk. Nitrided/ Stk. size. $15 Qty: MAEVN-1204 INT N Mazda Miata 1.8Lts. 28.00x5.94x102.60mm /SS/ Blk. Nitrided/ /Stk.head/ +0.6mm longer. $16 Qty: MAEVN-1206 INT N Mazda Miata 1.8Lts. 29.00x5.94x102.60mm /SS/ Blk. Nitrided/ /1mm++ head/ +0.6mm longer. $16 Qty: Mazda/Ford Duratec MAEVI-2304 EXH I Mazda/Ford Duratec 2.0 /2.3Lts. 31.00 x5.48 x 104.70mm / 1mm++/Dish $23 Qty: MAEVN-2301F EXH N Mazda/Ford Duratec 2.0 /2.3Lts. 30 x5.48 x 104.70mm /SS/ Blk. Nitrided/ Flat/Std. size. $16 Qty: MAEVN-2304D EXH N Mazda/Ford Duratec2.0 / 2.3Lts. 31.00 x5.48 x 104.70mm /SS/ Blk. Nitrided/ 1mm++/Dish $16 Qty: MAEVN-2304F EXH N Mazda/Ford Duratec 2.0 /2.3Lts. 31.00 x5.48 x 104.70mm /SS/ Blk. Nitrided/ 1mm++/Flat $16 Qty: MAEVN-2304FS EXH N Mazda/Ford Duratec 2.0 /2.3Lts. 31.00 x5.48 x 103.70(-1)mm /SS/ Blk. Nitrided/ 1mm++/Flat/ 1mm shorter tip. $16 Qty: MAEVN-2306F EXH N Mazda/Ford Duratec 2.0 /2.3Lts. 32 x5.48 x 104.70mm /SS/ Blk. Nitrided/ Flat/Std. size/+ 2mm $16 Qty: MAIVN-2301F INT N Mazda/Ford Duratec 2.0 /2.3Lts. 35 x5.48 x 103.40mm /SS/ Blk. Nitrided/ Std. size/Flat/Undercut/Backcut. $17 Qty: MAIVN-2304D INT N Mazda/Ford Duratec 2.0 /2.3Lts. 36 x5.48 x 103.40mm /SS/ Blk. Nitrided/ + 1mm /Dish/Undercut/Backcut. $17 Qty: MAIVN-2304F INT N Mazda/Ford Duratec 2.0 /2.3Lts. 36 x5.48 x 103.40mm /SS/ Blk. Nitrided/ + 1mm /Flat/Undercut/Backcut. $17 Qty: MAIVN-2304FS INT N Mazda/Ford Duratec 2.0 /2.3Lts. 36 x5.48 x 102.40mm /SS/ Blk. Nitrided/ + 1mm /Flat/Undercut/Backcut/ 1mm shorter tip. $17 Qty: MAIVN-2308 INT N Mazda/Ford Duratec 2.0 /2.3Lts. 36 x5.48 x 102.40mm /SS/ Blk. Nitrided/ + 2.5 mm /Undercut/Backcut/ 1mm shorter tip. $17 Qty:

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