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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: (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 Nissan NEVI-1001 EXH I CA18 DET Valve 28.15x5.97x88.30mm /  Std Size $33 Qty: NEVI-1005/7 EXH I SR20D Valve 30.15x6.94x102.40mm /  stk.size. $23 Qty: NEVI-1007 EXH I SR20D Valve 31.15x5.94x102.40mm /  1 mm + $23 Qty: NEVI-1007/7 EXH I SR20DET Valve 31.15x6.94x102.40mm / +1mm $23 Qty: NEVI-1011 EXH I 240 /KA24DE Valve, 32x6.94x99mm / 0.7mm + $23 Qty: NEVI-1017 EXH I 300ZX/VG30D Valve 30x5.94x103.70mm / Chromed/ 0.5mm + $23 Qty: NEVI-1023 EXH I Nismo 350/VQ35 Valve 30.50x5.95x95mm/  Flat/ -0.8mm head diam/ +1 stem $23 Qty: NEVI-1025 EXH I 350/VQ35 Valve 31.35x5.95x94mm/  Dish/ Std. size $23 Qty: NEVI-1028 EXH I 350/VQ35 Valve 32.35x5.95x94mm/  Dish/ + 1mm.. $23 Qty: NEVI-1029F EXH I 350/VQ35 Valve 33.0 (+1.65)x5.95x94mm/  Flat $54 Qty: NEVI-1032/7 EXH I RB26 Valve 31.15x6.94x101.60mm / +1mm $27 Qty: NEVI-1052 EXH I RB25 Valve 30.65(+1)x5.94x 89.00mm / +1mm $29 Qty: NEVI-1052/SL EXH I RB25 Valve 30.65(+1)x5.94x 105.80mm / 16.8mm Longer Valve for Solid Lifter. Groove 10mm higher. $29 Qty: NEVN-1005 EXH N SR20D Valve 30.15x5.94x102.40mm / SS/ stk.size. $15 Qty: NEVN-1006 EXH N SR20D Valve 30.65x5.94x102.40mm / SS/ 0.5mm + $15 Qty: NEVN-1007 EXH N SR20D Valve 31.15x5.94x102.40mm / SS/ 1 mm + $15 Qty: NEVN-1010 EXH N 240SX/KA24DE Valve 31.80x6.94x99.00mm/SS/ 0.5+/ Undercut $17 Qty: NEVN-1025 EXH N 350/VQ35 Valve 31.35x5.95x94mm/ SS/Black Nitrided/ Dish/ Std. size $17 Qty: NEVN-1028 EXH N 350/VQ35 Valve 32.35(+1)x5.95x94mm/ SS/ Dish. $17 Qty: NEVN-1028/2 EXH N 350/VQ35 Valve 32.35(+1) x5.95x96.50mm/ SS/ Dish/ +2.5mm Longer Tip $18 Qty: NEVN-3470D EXH N Patrol TB48DE Valve 34.80 (+1.5mm)x6.95x98.30mm / SS/ undercut/ swirl polish/Dish $14 Qty: NEVN-3470F EXH N Patrol TB48DE Valve 34.80 (+1.5mm)x6.95x98.30mm / SS/ undercut/ swirl polish/Flat $14 Qty: NIVN-1001 INT N CA18 DET Valve 34.15x5.97x88.90mm / SS Blk. Nitride / Std Size $20 Qty: NIVN-1005 INT N SR20D Valve 34.15x5.97x101.40mm / SS/ stk.size. $15 Qty: NIVN-1006 INT N SR20D Valve 34.65x5.97x101.40mm / SS/ 0.5mm + $15 Qty: NIVN-1007 INT N SR20D Valve 35.15x5.97x101.40mm / SS/ 1mm + $15 Qty: NIVN-1009 INT N 240SX/KA24DE Valve 36.60x6.97x101.30mm/SS/ Std. size/Back-cut. $17 Qty: NIVN-1010 INT N 240SX/KA24DE Valve 37.10x6.97x101.30mm/SS/ 0.5+ $17 Qty: NIVN-1017 INT N 300ZX/VG30D Valve 34.50x5.97x103.15mm / SS/ 0.5mm + $15 Qty: NIVN-1025 INT N 350/VQ35 Valve 37.15x5.96x96.60mm /SS./  Undercut /Back cut / dish $17 Qty: NIVN-1028 INT N 350/VQ35 Valve 38.15x5.96x96.60mm/SS/ Undercut/Back-cut/ Dish/ + 1mm $17 Qty: NIVN-1028/2 INT N 350/VQ35 Valve 38.15(+1) x5.96x99.10mm/SS/ Undercut/Back-cut/ Dish/ + 2.5mm longer tip. $18 Qty: NIVN-1032 INT N RB26DET Valve 35.15x5.97x102.30mm / SS/ 1mm + $17 Qty: NIVN-1052 INT N RB25 Valve 35.15(+1) x 5.97x 86.75mm / SS/ Undercut/Back-cut. $17 Qty: NIVN-1052/SL INT N RB25 Valve 35.15(+1) x 5.97x 103.55mm / SS/ Undercut/Back-cut.16.8mm Longer for Solid Lifter. Groove 10mm. $18 Qty: NIVN-4070D INT N Patrol TB48DE Valve 40(+1.5mm)x6.97x100.10mm / SS/ Undercut/ 32 degree back-cut/swirl polish/Dish $15 Qty: NIVN-4070D INT N Patrol TB48DE Valve 40(+1.5mm)x6.97x100.10mm / SS/ Undercut/ 32 degree back-cut/swirl polish/Flat $15 Qty:

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