{"title":"Ferrea","description":null,"products":[{"product_id":"ferrea-6000-series-k-series-intake-exhaust-valves","title":"Ferrea 6000 Series Intake \u0026 Exhaust Valves for K Series","description":"\u003cul\u003e\n\u003cli\u003eCompatible with K20A, K20Z, and K24A Engines \u003c\/li\u003e\n\u003cli\u003eSold as Set of 8 Valves \u003c\/li\u003e\n\u003cli\u003eEnhanced Airflow from Radius Groove Design \u003c\/li\u003e\n\u003cli\u003eIntake and Exhaust Valves Available \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#InstallGuide\"\u003eInstall Guide\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eFerrea 6000 Series Valves - K Series\u003c\/h3\u003e\n\n\u003cp\u003eYou've done full bolt ons and are eyeing the next step in your project. Valvetrain should be it. The stock valves weren't designed for the spring pressures and RPM that aggressive cam profiles demand. Ferrea's 6000 Series valves are the upgrade for K20 and K24 builders who need valvetrain reliability at high RPM without spending Competition Plus money. These are one-piece forged stainless steel valves with hard chrome stems and radius groove profiles. They're stock size, 35mm intake and 30mm exhaust, so they drop straight into a stock K series head with no machine work required. If you're running aggressive cams, dual valve springs, or you're revving past 8,500 RPM regularly, upgrade your valves before they become the weak link.\u003c\/p\u003e\n\n\u003ch4\u003eHere's Why Factory Valves Fail\u003c\/h4\u003e\n\n\u003cp\u003eStock K series valves are designed for factory spring pressures and stock RPM limits. When you install Stage 2 or Stage 3 cams with dual valve springs, you're multiplying the forces on the valves. The springs are pressing harder on the valve stem and the cam's hitting the valve faster. Stock valves aren't heat-treated to handle that abuse. The stems wear from the increased spring pressure. The tips mushroom from repeated lash adjustments. At high RPM, 8,500+ - the stock valves can't handle the stress and you're risking valve float or worse. Ferrea 6000 Series valves are forged and heat-treated specifically for high spring pressures and high RPM. The hard chrome stems resist wear and the tips are hardened to prevent mushrooming when you're checking valve lash.\u003c\/p\u003e\n\n\u003ch4\u003eOne-Piece Forged Stainless Steel\u003c\/h4\u003e\n\n\u003cp\u003eFerrea forges these valves from one piece of stainless steel. They're not welded or assembled from multiple parts. The one-piece forging means there's no weak point where different pieces meet. The valve's solid from the head to the tip. After forging, Ferrea runs them through a proprietary heat treatment process that increases strength and fatigue resistance. That matters when you're running the motor hard at 9,000 RPM or sitting on the limiter. The valves take the beating without cracking or failing. Both intake and exhaust valves use the same stainless steel construction and heat treatment process.\u003c\/p\u003e\n\n\u003ch4\u003eHard Chrome Stems and Radius Groove Profiles\u003c\/h4\u003e\n\n\u003cp\u003eThe valve stems are hard chrome plated. Hard chrome's way harder than the raw stainless so the stems resist wear from the valve guides and valve spring pressure. You're not getting stem wear that leads to oil consumption or valve guide damage. The intake valves use a 20 degree radius groove profile and the exhaust valves use a 22 degree radius groove profile. The radius groove design improves airflow compared to a sharp-edge valve seat. You're getting better flow into and out of the cylinder which means more power. The tips are hardened so they don't mushroom when you're adjusting valve lash. Stock valve tips get beat up after a few lash checks. These don't.\u003c\/p\u003e\n\n\u003ch4\u003eStock Size Valves Drop Right In\u003c\/h4\u003e\n\n\u003cp\u003eThese are stock diameter valves, 35mm intake and 30mm exhaust. They drop straight into a stock K series head. You're not cutting new valve seats or doing any machine work. Pull the old valves, drop the Ferrea valves in, done. If you're doing oversized valves - +1mm or bigger - that's a different part number and your machine shop needs to cut new valve seats. Don't try to run oversized valves in stock seats. You'll actually lose power because the valve seat won't seal properly. For most builds, stock size valves with a good port and polish job are plenty. Save the oversized valve headache for when you're chasing every last horsepower on a race motor.\u003c\/p\u003e\n\n\u003ch4\u003eWhat You Get\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eIntake Valves (Part Number F6073):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSet of 8 intake valves (one complete side)\u003c\/li\u003e\n  \u003cli\u003e35mm head diameter (stock size)\u003c\/li\u003e\n  \u003cli\u003e5.47mm stem diameter\u003c\/li\u003e\n  \u003cli\u003e109.3mm overall length\u003c\/li\u003e\n  \u003cli\u003e2.5mm tip length\u003c\/li\u003e\n  \u003cli\u003e20 degree radius groove profile\u003c\/li\u003e\n  \u003cli\u003eOne-piece forged stainless steel\u003c\/li\u003e\n  \u003cli\u003eHard chrome stem\u003c\/li\u003e\n  \u003cli\u003eHardened tip\u003c\/li\u003e\n  \u003cli\u003eProprietary heat treatment\u003c\/li\u003e\n  \u003cli\u003eFully CNC machined\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eExhaust Valves (Part Number F6071):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSet of 8 exhaust valves (one complete side)\u003c\/li\u003e\n  \u003cli\u003e30mm head diameter (stock size)\u003c\/li\u003e\n  \u003cli\u003e5.45mm stem diameter\u003c\/li\u003e\n  \u003cli\u003e109.15mm overall length\u003c\/li\u003e\n  \u003cli\u003e2.5mm tip length\u003c\/li\u003e\n  \u003cli\u003e22 degree radius groove profile\u003c\/li\u003e\n  \u003cli\u003eOne-piece forged stainless steel\u003c\/li\u003e\n  \u003cli\u003eHard chrome stem\u003c\/li\u003e\n  \u003cli\u003eHardened tip\u003c\/li\u003e\n  \u003cli\u003eProprietary heat treatment\u003c\/li\u003e\n  \u003cli\u003eFully CNC machined\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFits These Engines\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003eK20A2, K20A3, K20Z1, K20Z3 (all K20 DOHC)\u003c\/li\u003e\n  \u003cli\u003eK24A1, K24A2, K24A4, K24A8 (all K24 DOHC)\u003c\/li\u003e\n  \u003cli\u003eJDM K20A (DC5\/EP3 Type R)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Intake and exhaust valves are sold separately. If you're doing a full valvetrain refresh, order both part numbers. Each part number gets you 8 valves (one complete side). You'll also need valve springs, retainers, locks, and seals. The 6000 Series works with any quality K series valve spring setup. If you're running aggressive cams, get dual valve springs rated for your RPM and spring pressure. Make sure your locks match your retainers - 7 degree or 10 degree - and don't reuse old valve seals on a fresh build. These are stock size valves so no machine work's required. If you want oversized valves (+1mm or bigger), that's a different part number and your machine shop needs to cut new valve seats before you install them.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003cspan class=\"tag\"\u003e2002-2006 Acura RSX \u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2002-2006 Acura RSX Type-S\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2004-2008 Acura TSX \u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2003-2007 Honda Accord \u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e\u003c!--StartFragment--\u003e\u003cspan class=\"tag\"\u003e2002-2005 Honda Civic Si\u003c\/span\u003e\u003cbr\u003e\u003c!--EndFragment--\u003e\u003c\/span\u003e\u003cdiv\u003e\n\u003cspan class=\"tag\"\u003e2006-2011 Honda Civic Si\u003c\/span\u003e\u003cbr\u003e\u003cdiv\u003e\n\u003cspan class=\"tag\"\u003e2002-2006 Honda CR-V\u003c\/span\u003e\u003cbr\u003e\u003c!--EndFragment--\u003e\u003cspan class=\"tag\"\u003e2003-2011 Honda Element \u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\n\n\u003c\/li\u003e\n\n\n\n \n\u003cli id=\"Included\"\u003e\n(8) Valves*\u003cdiv\u003e\u003cspan style=\"font-style: italic;\"\u003e*Intake or Exhaust Depends on Selection\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\u003cli id=\"InstallGuide\"\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n","brand":"Ferrea","offers":[{"title":"Exhaust","offer_id":45277864099874,"sku":"FER-F6071","price":175.25,"currency_code":"USD","in_stock":false},{"title":"Intake","offer_id":45277864132642,"sku":"FER-F6073","price":168.7,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/ferrea-6000-series-intake-exha_jqxm.jpg?v=1777296834"},{"product_id":"ferrea-k-series-valve-spring-kit-endurance-kit-for-acura-honda","title":"Ferrea Dual Valve Spring Kit for Honda\/Acura K Series","description":"\u003cul\u003e\n\u003cli\u003eAvailable in Two Styles, Drag \u0026amp; Endurance \u003c\/li\u003e\n\u003cli\u003eDesigned for High Revving Engines \u003c\/li\u003e\n\u003cli\u003eNecessary Upgrade for Aggressive Cam Profiles \u003c\/li\u003e\n\u003cli\u003eCompatible with K20A, K20Z, and K24A Engines \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#InstallGuide\"\u003eInstall Guide\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eFerrea Dual Valve Spring Kit - Honda\/Acura K Series\u003c\/h3\u003e\n\n\u003cp\u003eYou're installing Skunk2 Stage 3 cams in your K20 and you need valve springs that can actually handle 0.520 inch lift at 8,500 RPM without floating or binding. Your stock springs are done. They've lost preload from 80,000 miles of heat cycles, they can't handle the lift your new cams are throwing at them, and they're going to float before you even get close to the RPM your build's capable of. Ferrea makes two valve spring kits for K series engines: the KT4004 Drag Racing kit and the KT4003 Endurance kit. Here's the difference. The drag kit uses S10100 springs with 105 lbs of seat pressure. That's for aggressive cams with 0.500+ inch lift, for drag racing where you're banging off the rev limiter at 9,000 RPM every pass, and for high-RPM all-motor or turbo builds that need serious spring pressure to keep the valves under control. The endurance kit uses S10099 springs with 80 lbs of seat pressure. That's for road racing, time attack, street\/track cars with mild or moderate cams, and builds that need to last an entire race season or 50,000 street miles without losing spring pressure. Both kits come with 16 dual springs, 16 titanium retainers, 16 chromoly seat locators, and 16 valve locks. Everything you need to replace your entire valvetrain.\u003c\/p\u003e\n\n\u003ch4\u003eHere's What Happens When Stock Springs Fail\u003c\/h4\u003e\n\n\u003cp\u003eStock valve springs fail three ways and all three of them will ruin your day. First is coil bind. You're running a cam with 0.520 inch lift and your stock springs can only handle 0.450 inch before the coils stack on each other and bind up. Now the valve can't open fully, you're losing power, and you're loading up the cam lobes with side pressure they weren't designed for. You bend a valve or you wear out the cam and you're pulling the head. Second is breaking. The springs fatigue from hundreds of thousands of compression cycles at high RPM. The metal gets weak, a coil snaps, the spring breaks in half, and the valve drops into the combustion chamber. The piston hits it on the way up, bends the valve, punches a hole in the piston crown, and now you're rebuilding the whole engine. Third is valve float. This one's sneaky because it doesn't break anything immediately but it kills your power. The spring pressure's not high enough to close the valve fully before the cam comes back around to open it again. You're at 8,000 RPM and the valve's just hanging there half-open. Combustion gases are leaking past it, you're losing cylinder pressure, and the engine's making less power even though you're revving higher. We've seen all three failures on K series engines with stock springs and aggressive cams. It's not a matter of if, it's when.\u003c\/p\u003e\n\n\u003ch4\u003eDrag Kit vs. Endurance Kit - Here's How You Pick\u003c\/h4\u003e\n\n\u003cp\u003eDon't pick the drag kit just because you're building a turbo car. Don't pick the endurance kit just because you're tracking the car. That's not how this works. Here's how you actually decide. If you're running stock cams or mild cams (Stage 1 or Stage 2, usually 0.400-0.480 inch lift) and your car's a street car or a weekend warrior that sees a few track days a year, get the endurance kit. The 80 lbs of seat pressure is plenty for mild cams and it creates less friction on the cam lobes. Less friction means the cams last longer and you're not robbing power to overcome valvetrain drag. If you're running aggressive cams (Stage 3 or race cams, 0.500+ inch lift), if you're drag racing and you're bouncing off 9,000 RPM every pass, or if you're building a high-RPM all-motor engine that lives at 8,500 RPM, get the drag kit. The 105 lbs of seat pressure is there to control the valves when you're throwing that much lift at them at that RPM. Running more spring pressure than you need is bad. It wears out your cam lobes faster, it adds friction, and it robs power. We had a customer run drag springs on a street car with mild cams and he wore out a set of Skunk2 Stage 2 cams in 40,000 miles because the spring pressure was beating up the lobes. The endurance kit would've been fine and his cams would've lasted 100,000 miles.\u003c\/p\u003e\n\n\u003ch4\u003eDual Springs with Titanium Retainers\u003c\/h4\u003e\n\n\u003cp\u003eBoth kits use dual springs. That's an outer spring and an inner spring nested together. They work as a team to give you higher total spring pressure while also dampening harmonics. Harmonics are vibrations that run through the valvetrain at high RPM. If you don't control them, they make the springs resonate and lose effective pressure even though the springs themselves haven't physically weakened. The dual spring setup fixes that because the inner and outer springs vibrate at different frequencies and they cancel each other out. Dual springs also give you a safety net. If the outer spring breaks, the inner spring's still there keeping the valve from dropping into the cylinder. We've never actually seen a Ferrea spring break but if it did happen, you'd limp home instead of grenading the engine. The kits come with titanium retainers. That's the piece that sits on top of the spring and holds it onto the valve. Titanium's way lighter than steel. Less weight up top means less reciprocating mass bouncing up and down thousands of times per minute. The springs don't have to work as hard to control lighter retainers and you get better valve control at high RPM. You can rev higher before you hit valve float.\u003c\/p\u003e\n\n\u003ch4\u003eSeat Locators Set Installed Height - Don't Screw This Up\u003c\/h4\u003e\n\n\u003cp\u003eBoth kits come with seat locators and you have to use them. Don't try to reuse your stock seat locators. The drag kit uses SL1053 seat locators and the endurance kit uses SL1052 seat locators. They're not interchangeable. The seat locators set the installed height for the springs. Installed height's the distance from the top of the seat locator to the bottom of the retainer when the valve's closed. The drag kit's installed height is 39mm and the endurance kit's installed height is 40mm. That 1mm difference changes the seat pressure. If you use the wrong seat locators or you try to reuse stock locators, your installed height's going to be off, your seat pressure's going to be wrong, and you might put the springs into coil bind at full cam lift. Measure your installed height after you install the springs. If it's not within spec, you need to shim the seat locators to get it right. This isn't optional. Wrong installed height will cause problems. The valve locks that come with both kits are K10034. They're 10-degree locks. Don't mix them with locks or retainers from other companies unless you've confirmed the keeper angle matches. If you mix a 10-degree lock with a 7-degree retainer, the lock won't seat properly and the valve's going to drop. We've seen it happen. It's ugly.\u003c\/p\u003e\n\n\u003ch4\u003eTitanium Retainers Wear Over Time on Street Cars\u003c\/h4\u003e\n\n\u003cp\u003eThe titanium retainers are great for race engines but they do wear. The spring sits on top of the retainer and every time the spring compresses and extends, there's contact between the two. Over tens of thousands of miles, the titanium wears down. It's not a big deal on a race engine that gets torn down every season. You inspect the retainers, you replace them if they're worn, and you move on. On a street car that's going to go 50,000 or 100,000 miles between valve jobs, the titanium retainers might need to be replaced before the springs do. If you're building a street car and you want to set it and forget it, you might want to consider Ferrea's tool steel retainers instead (part number E20044, sold separately). They're heavier than titanium but they last longer. For a race engine or a high-RPM build that gets refreshed regularly, stick with the titanium retainers. The weight savings are worth it.\u003c\/p\u003e\n\n\u003ch4\u003eFerrea vs. Cheaper Springs - Here's the Difference\u003c\/h4\u003e\n\n\u003cp\u003eFerrea springs cost about twice as much as Supertech springs. Supertech's SPR-H1021D dual springs work fine for a lot of builds and they're half the price. So why spend the extra money on Ferrea? It comes down to spring pressure retention. Cheap springs lose pressure over time. We've tested this. A cheap spring starts at 100 lbs of seat pressure. After 20 track days or a full drag racing season, it's down to 85-90 lbs. That 10-15% loss is enough to cause valve float at high RPM. Ferrea springs hold their pressure. We've run the same set of Ferrea drag springs through an entire season of time attack racing and the seat pressure at the end of the season was within 2-3 lbs of where it started. That consistency matters when you're pushing the engine hard. Ferrea's also the standard in professional racing. These are the same springs you'll find in Formula 1 engines, Indy Car engines, NASCAR engines, and top-tier drag racing builds. If you're building a budget street car with Stage 1 cams, buy the cheaper springs and save your money. If you're building a serious race engine or a high-RPM all-motor build that's going to see sustained abuse, spend the money on Ferrea. You're buying reliability and consistency.\u003c\/p\u003e\n\n\u003ch4\u003eWhat You Get\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFerrea dual valve spring kit for K20\/K24 engines (select Drag or Endurance when ordering)\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eKT4004 Drag Racing Kit:\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e16 dual valve springs (S10100) - 105 lbs seat pressure @ 39mm installed height, 225 lbs open pressure @ 29mm, 305 lbs\/in spring rate, max lift 0.590\", max RPM 9,500, coil bind at 22mm\u003c\/li\u003e\n  \u003cli\u003e16 titanium retainers (E11066) - lightweight for reduced reciprocating mass\u003c\/li\u003e\n  \u003cli\u003e16 chromoly seat locators (SL1053) - CNC machined 4140 chromoly, nitrided surface, sets 39mm installed height\u003c\/li\u003e\n  \u003cli\u003e16 valve locks (K10034) - 10-degree cone-style keepers\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eKT4003 Endurance Kit:\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e16 dual valve springs (S10099) - 80 lbs seat pressure @ 40mm installed height, lower friction for longer cam life\u003c\/li\u003e\n  \u003cli\u003e16 titanium retainers (E11066) - lightweight for reduced reciprocating mass\u003c\/li\u003e\n  \u003cli\u003e16 chromoly seat locators (SL1052) - CNC machined 4140 chromoly, nitrided surface, sets 40mm installed height\u003c\/li\u003e\n  \u003cli\u003e16 valve locks (K10034) - 10-degree cone-style keepers\u003c\/li\u003e\n  \u003cli\u003ePremium chrome silicon steel springs with heat treatment and stress relief\u003c\/li\u003e\n  \u003cli\u003eDual spring design controls harmonics and provides safety net if outer spring fails\u003c\/li\u003e\n  \u003cli\u003eComplete kit for all 16 valves (8 intake, 8 exhaust)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFits These Engines\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003eK20A2 - 2002-2004 Acura RSX Type S\u003c\/li\u003e\n  \u003cli\u003eK20A3 - 2002-2006 Acura RSX Base, 2002-2005 Honda Civic Si\u003c\/li\u003e\n  \u003cli\u003eK20Z1 - 2005-2006 Acura RSX Type S\u003c\/li\u003e\n  \u003cli\u003eK20Z3 - 2006-2011 Honda Civic Si\u003c\/li\u003e\n  \u003cli\u003eK24A1 - 2002-2006 Honda CR-V\u003c\/li\u003e\n  \u003cli\u003eK24A2 - 2004-2008 Acura TSX\u003c\/li\u003e\n  \u003cli\u003eK24A4 - 2003-2007 Honda Accord\u003c\/li\u003e\n  \u003cli\u003eK24A8 - 2003-2011 Honda Element\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Drag kit (KT4004) is for aggressive cams with 0.500\"+ lift, drag racing, high-RPM builds (8,500-9,500 RPM), or engines that regularly bounce off the rev limiter. Endurance kit (KT4003) is for mild to moderate cams (up to 0.480\" lift), street\/track cars, road racing, or builds that need to last 50,000+ miles between teardowns. DO NOT use drag kit seat locators (SL1053) with endurance springs or endurance seat locators (SL1052) with drag springs - they set different installed heights (39mm vs. 40mm) and mixing them will give you wrong seat pressure and possible coil bind. You MUST discard your stock seat locators and use the Ferrea ones included in the kit. Measure installed height after installation and shim if necessary to achieve spec. Requires valve spring compressor tool and you'll need to replace valve stem seals during installation. The K10034 valve locks are 10-degree locks - don't mix them with retainers or locks from other manufacturers unless you've confirmed keeper angle compatibility or you'll drop a valve. Titanium retainers wear over time from spring contact - inspect them periodically on street cars with high mileage or consider Ferrea's tool steel retainers (E20044, sold separately) for long-term street use. Always check valve-to-piston clearance with clay modeling after installing new cams and springs - inadequate clearance will cause piston-to-valve contact at high RPM. Ferrea costs about 2x Supertech but holds seat pressure better over hundreds of dyno pulls or full race seasons - worth it for serious builds, overkill for budget street cars with mild cams.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n \u003cspan class=\"tag\"\u003e2002-2006 Acura RSX Base\/Type-S\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2004-2008 Acura TSX \u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2003-2007 Honda Accord\u003c\/span\u003e\u003cdiv\u003e\n\u003cspan class=\"tag\"\u003e\u003c\/span\u003e\u003c!--StartFragment--\u003e2002-2005 Honda Civic Si\u003c!--EndFragment--\u003e\u003cbr\u003e\u003cspan class=\"tag\"\u003e2006-2011 Honda Civic Si\u003c\/span\u003e\u003cbr\u003e\u003cdiv\u003e\n\u003c!--StartFragment--\u003e\u003cspan class=\"tag\"\u003e2002-2006 Honda CR-V\u003c\/span\u003e\u003cbr\u003e\u003c!--EndFragment--\u003e\u003cspan class=\"tag\"\u003e2003-2011 Honda Element\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\n\n\u003c\/li\u003e\n\n\n\n \n\u003cli id=\"Included\"\u003e\n(16) Dual Valve Springs\u003cdiv\u003e(16) Valve Spring Seats\u003c\/div\u003e\n\u003cdiv\u003e(16) Titanium Valve Spring Retainers\u003c\/div\u003e\n\u003cdiv\u003e(16) Valve Locks\u003c\/div\u003e\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\u003cli id=\"InstallGuide\"\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n","brand":"Ferrea","offers":[{"title":"Drag","offer_id":45321974087714,"sku":"FER-KT4004","price":1041.41,"currency_code":"USD","in_stock":false},{"title":"Endurance","offer_id":45321974120482,"sku":"FER-KT4003","price":1064.02,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/ferrea-dual-valve-spring-kit-f_47bb.jpg?v=1777669503"}],"url":"https:\/\/www.hybrid-racing.com\/collections\/ferrea.oembed","provider":"Hybrid Racing","version":"1.0","type":"link"}