Page 6 of Valvetrain and Timing by Parts Pro

2006 parts pro master catalog high performance ford modular sohc 2v dohc 4v components part description id seat load open load 4.6 liter sohc valve springs for .550 lift single beehive springs 26113-16 .959/1.061 for 1994-2000 .636 738 93 1.570 198 1.020 26113-16 .959/1.061 for 2001-up .636 738 80 1.640 185 1.090 4.6 liter 4 valve head valve springs for .500 lift single beehive springs 26123-32 .940/1.110 .575 742 90 1.470 252 .970 coil bind rate lbs .952 .952 .900 191 191 324 adv duration 050 rpm range cam in ex in ex xtreme energy hydraulic 4.6l 5.4l sohc modular 1992-present works on standard and performance improvement heads stock replacement cam with more rv power better torque and power 1200 to 5200 102100 262 270 224 232 will work with stock computer mild street performance 3.23-3.55 gears good torque and power 1600 to 5600 102200 268 274 230 236 will work with stock computer hot street cam 3.55-3.73 gears 2000 stall 2000 to 6000 102300 274 278 236 240 computer upgrade recommended rough idle 1999-up performance improvement heads or pre `99 heads with retainer to guide clearance mods better low and mid range torque with more power will work with stock computer 1400 to 5400 102500 262 266 226 230 valve springs recommended hot street cam needs 3.55 gears 2000 stall intake exhaust computer and 1800 to 5800 102600 270 274 234 238 spring upgrade recommended noticeable idle street/strip needs 3.73 gears 2400 stall intake exhaust computer and 2200 to 6200 102700 278 282 242 246 spring upgrade required rough idle xtreme energy hydraulic 4.6l 5.4l 4 valve dohc modular 1992-present works on standard and performance improvement heads street performance with excellent torque use spring number 26123 1500-5800 106300 261 259 226 224 no computer modifications noticeable idle hot performance cams for serious horsepower and torque gains lower gears 1800-6200 106400 269 267 234 232 computer mods larger throttle body mass air injectors and exhaust upgrades use spring number 26123 manual trans or a 2200 stall rough idle race or limited street use larger throttle body mass air injectors exhaust 2200-6500 106500 277 275 242 240 upgrades and computer modifications manual trans or a 3000 stall use spring number 26123 very rough idle xe-r supercharged and nitrous hydraulic 4.6l 5.4l 4 valve dohc modular 1992-present works on standard and performance improvement heads street performance with excellent torque works well in supercharged or 1200-5800 106260 257 259 222 224 nitrous engines use spring number 26123 no computer modifications necessary serious street effort for modifications lower gears and spring number 26123 1500-6000 106360 265 267 230 232 automatics will require a 2000 stall mild rough idle max strip and street cams large gains in power with computer modifications 2000-6400 106460 273 275 238 240 larger throttle body mass air injectors and exhaust upgrades use spring number 26123 manual trans or a 2500 stall rough idle application description lift valve in ex .500 .500 .500 .500 .500 .500 .550 .550 .550 .550 .550 .550 .475 .475 .450 .450 .475 .450 .475 .475 .475 .450 .450 .450 why are some cams black finished while others are machine finished so with the excitement of christmas morning you open the camshaft box expecting to see a shiny chrome-looking camshaft like the one in the ad but find your camshaft is black in color and far from shiny so what gives not to worry camshafts come in a variety of finishes but chiefly fall into two categories roller and flat tappet roller camshafts due to the type of contact made by the roller and the fact that there is no real break-in requirement feature a polished exterior with only a very light protective oil coating to inhibit rust for that reason they appear shiny and polished flat tappet camshafts are completely different and feature the black exterior coating in fact the black appearance is due to the age-old process of parkerizing or luberite a coating developed during world war ii to keep metal parts from rusting during transit from the us to europe during those long sea voyages the parkerizing process involves an acid dip that not only cleans the camshaft but puts a thin layer of a very soft metal such as zinc or magnesium which acts as a lubricant on the surface of the camshaft says billy godbold lead cam designer for comp cams this film is critical not only to inhibit rust during storage and transit but also during camshaft break-in the process helps to ensure that the lifters seat properly when the camshaft is new the soft metal breaks down and actually helps lap the lifters in position the parkerizing procedure is conducted immediately after the camshaft is ground to spec the camshaft bearing journals are first wrapped to avoid exposure from the acid then using the five stainless steel tanks located at comp s manufacturing facility each camshaft is dipped through the series of tanks to perform the parkerizing process and apply the soft metal on the surface of the lobes nitriding is performed on many of our sport compact and severe duty flat tappet engines to increase the hardness of the camshaft continues godbold these camshafts come completely black including the camshaft journals this process is especially designed for camshaft applications where wear has been a problem with factory camshafts nitriding cures that problem by creating this very thin very hard surface nitriding can be performed on any comp cams flat tappet camshaft for an extra charge when ordered by the customer some parts are not legal for sale or use in california on any pollution controlled motor vehicle 71

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