Engineering The Science Of Geometry - Crower

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Engineering the Science of GeometryAnatomy of aCROWER ROCKEROur lash adjusters are machined from aircraft qualityHi-temp alloy, precision thread rolled after doubleheat treat process.Our 2024 aluminum bodiesdeliver maximum strength atoperating temperature.Aircraft quality12 point nuts.Hardened tip wheelwithstands racerigors and minimizesscrubbing.Needle Bearing Tip OptionCrower has raised the baron valve train technology with anew needle bearing roller tip optionavailable on all new Crower stud andshaft mount rocker arm assemblies.Specify #73715Rafter rocker part numberfor stainless steel, #72915Rfor aluminum.Fully rollerized precisionneedle bearing fulcrum.Our Axles are “super secured” fortrouble free operation.Reduced frictionfor added horsepower and reduced valveguide and valve stem wear.Crower shafts are CNCprecision machinedfrom ball race alloysteels, heat-treatedtwice and micro finishground in-house.Rocker RatioIdeal rockergeometry athalf valve liftThe lighter tip deliversgreater valve control forincreased rpm and improvesvalve spring longevityby decreasing heat overtraditional non needle designs.Rocker arm ratio isdetermined by dividingthe distance fromthe fulcrum to the tipcenterpoints (Y) bythe distance from thefulcrum to the pushrodseat centerpoints (X).This theoretical ratiomay vary from our net/advertised ratio due tomeasured valve traindeflection under load.This configurationminimizes tip travel acrossthe valve stem and keepscontact centered on topof the valve, reducingfrictional losses due tovalve guide side loadingand tip scrubbing. PushrodHighest unit loadingdeflection is also minimizedon the valve train is approximately at for more accurate valvehalf lift (45 @ cam lobe)action.90 90 Long ArmHigher rocker ratiosrequire extending thearm of the rocker. Longarm rockers allow properpushrod seat positioningin relation to the fulcrumpoint. An additional longarm benefit is reducedback and forth tip travelacross the valve stem. Lessscrubbing and valve stemside loading occur andassociated frictional lossesare minimized.Tip TravelLessThan90 LessThan90 No Liftcontact slightly behind centerlineWhen the valve is closed tipcontact is slightly behind thecenterline of the valve.146MoreThan90 90 90 Half Liftcenterline contact 1/2 liftAt highest unit loading (approx. 1/2 lift) tip contact ideally ison the centerline of the valve. The valve train is overcomingspring pressure and, more importantly, rapidly acceleratingits mass. To minimize deflection, side loading and frictionalloss, we want the valve train geometry in its strongest andstraightest configuration at this point.MoreThan90 Full Liftcontact slightly behind centerlineWhen the valve is fully open, tip contact is slightlybehind the centerline of the valve. The valve train inthis position (at high RPM) feels the least amount ofunit loading as float approaches.everything getsmomentarily weightless.For technical support call 619-661-6477 or visit www.crower.com

Useful Ordering Informationinboard exhaust valvesEXEXhead centerlineINTDetermining Which Crower ShaftRocker System Fits Your NeedsIf you’re not sure or don’t know which Crower ShaftRocker System will fit your cylinder head and need help,follow these simple terlineexhaust valveexhaust valvecenterline-to-exhaust centerline-to-intakevalve centerlinevalve centerlinedimensiondimension1. You’ll need to provide us with some critical informationand dimensions.a. Cylinder head manufacturerb. Engine typec. Intake and exhaust valve distances from cylinderhead centerline.d. Rocker stud spacing from cylinder head centerline.Rocker Body IdentificationTo order replacement rockers and insure correct fit you’ll needto provide your Crower technician with the following info.Rocker Bodies without I.D. numbers:Rocker Bodies with I.D. numbers: Rocker arm Ratio Rocker arm Body I.D. number Rocker arm Offset Rocker arm Ratio Which valve the rocker actuates Rocker arm Offset(intake or exhaust) Stand Number Which cylinder the rocker is Shaft Diametermounted on (2,4,6,8–1,3,5,7, etc.) Name/brand of cylinder head Stand Number Shaft DiameterHere’s how you do it.Measure the distance from the outside diameter of the twoinboard exhaust valves. Record the value. Subtract the diameterof the valve (Example: .341) from your recorded value and dividethis measurement by 2. Now you'll know the distance from thecylinder head centerline to exhaust valve centerline.Now measure the distance from the outside of the intake valveto the outside diameter of the exhaust valve diameter. Subtract.341" from that to get the centerline distance from exhaust tointake valve.Note: .341" diameter is based on 11/32" intake and exhaustvalves. Some cylinder heads have different size intake stems.Make sure you measure valve stem size before measuring valvecenterline.Aluminum StudMount RockersRatio and OffsetLocationsStainless StudMount Rockers2. Follow the same procedure for the studs.3. Supply us the dimensions and we’ll take it from there!Aluminum ShaftMount RockersFor technical support call 619-661-6477 or visit www.crower.comStainless ShaftMount Rockers147

Stainless Steel Stud Mounted RockersSteel billet rockers available forall popular LATE MODEL ROCKERSENDUROLONG ARM/BACKSETROLLERIZEDROCKERSCrower’s self-aligning rocker arms are available for latemodel small and big block Chevrolet, Dodge Magnum truckand the V10 Viper.Features include: Self aligning roller tip holds rocker in place 25 hp, 4 mph on 1/4 mile with 1.7’s on V10 Emissions Legal certified ARB #D-410Crower’s Long Arm/Backset trunnion rollerized rockers are made tothe same high tolerances as our standard stainless steel rocker armswith a .090" backset trunnion and these added features: Increased area under the lift curve Additional spring clearance (1.650") Smoother valve action Less side loading on stems/guides Drop on installation Set of 8 for intake (use standard Crower stainlesssteel rockers on 675-873678-8DescriptionRatioChevrolet 265-400 V8 1.5Chevrolet 265-400 V8 1.6Chevrolet 265-400 V8 1.65Chevrolet 265-400 V8 1.7Chevrolet 265-400 V8 1.75Chevrolet 265-400 V8 1.8Chevrolet 265-400 V8 1.85Stud7/167/167/167/167/167/167/16Note: May be purchased as mixed ratios intake and exhaust.Can be ordered N.S. without -1673660-1673661-1673608-16V6 Chevy 85-96, 97-98 VortecV6 Chevy 85-96, 97-98 VortecSB Chevy 85-96, 97-98 Vortec, LT1SB Chevy 85-96, 97-98 Vortec, LT1SB Chevy Narrow, Non AlignSB Chevy Narrow, Non AlignBB Chevy 85-96, 97-98 Vortec1.51.61.51.61.51.61.83/83/83/83/83/83/87/ *73663K*V6 Dodge MagnumV6 Dodge MagnumV8 Dodge MagnumV8 Dodge MagnumV10 Dodge MagnumV10 Dodge MagnumV10 Dodge ViperV10 Dodge 167/16CHEVROLETDODGERatio Stud* “K” incl. rocker studs. 5500 RPM limit on “K” kits (6300 on Viper)DODGE MAGNUM ROLLER ROCKER KITSOur “PK” kits are a must in order to maintain valve train integritywhen RPM’s over 5500 are reached. If sustained high RPM isexpected, you must upgrade to 68305X1 spring. “PK” kits includerocker studs, guide plates (#70518) & 1 pc. pushrods (#69695).When installing a .100" long valve, the rockerarm tip must be backed up .050" to insurecenterline contact at half lift. Crower offsetsthe rocker stud hole in the trunnion, pullingthe rocker tip back into correct alignment with thevalve stem. Re-establishing correctgeometry reduces valve guide wear and promotes moreaccurate valve 688-873689-8Part#Can be ordered N.S. without sure-locksENDURO CENTERLINEROLLERIZED ROCKERSPart#Made from 17-4PH stainless steel with 1025 heat-treating,these proven rollerized rockers feature premium, oversizedneedle bearings, sure-lock rocker nuts and alloy steel tip rollers.Superior lightweight body design provides plenty of clearancefor large diameter springs. Includes sure-locks.DescriptionChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 265-400 .050 backsetChevrolet 396-454 .050 backsetChevrolet 396-454 .050 backsetChevrolet 396-454 .050 backsetChevrolet 396-454 .050 backsetChevrolet 396-454 .090 backsetChevrolet 396-454 .090 backsetChevrolet 396-454 .090 backsetChevrolet 396-454 .090 751.81.651.71.751.8The above rockers may be purchased in sets of 8 to mix ratios.Note: 7/16 stud onV6 Dodge MagnumV6 Dodge MagnumV8 Dodge MagnumV8 Dodge MagnumRatio Stud1.61.71.61.73/83/83/83/8STAMPED STEELROCKER ARMSCrower’s stamped steel rockers utilizea longer slot for high lift, aftermarketcams. Made from high strength steelalloy and stamped to resist the rockerflex for the longest possibleoperating life.Part#Description73050-16 Chevrolet 265-400 (set 16)73051-16 Chevrolet 265-400 (set 16)73053 Chevrolet 265-400 (8 ea/8 ea) KitRatio1.51.61.5/1.6Note: For small block Chevrolet, a 1.6 ratio will raise grossvalve lift for a nominal horsepower increase.All rockers listed are 3/8 stud.Can be ordered N.S. without sure-locksCROWER HAS NHRA STOCK CLASS ACCEPTEDSTUD MOUNTED ROCKER SYSTEMS TO KEEPYOU AHEAD OF THE 648-12*73647-12*AMC 290-401 V8AMC 290-401 V8AMC 6 cyl.AMC 6 06-1673605-1673607-1673608-16Chevy II 4 cyl.Chevrolet 230 250 292 6cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 200 229 90 V6Chevrolet 200 229 90 V6Chevrolet 200 229 90 V6Chevrolet 200 229 90 V6Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8 LT1Chevrolet 265-400 V8Chevrolet 265-400 V8 LT1Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 73616-1673615-1673617-1673619-16Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 ac V8Pontiac V8Pontiac V8Pontiac V8Pontiac V8Pontiac 6* Oldsmobile 67-91 V8 V81.67/16AMCCHEVROLETFORDPONTIACOLDSMOBILERatio Stud* Requires machine work Note: Rocker arms can be purchasedin 1/2 sets (8 intake and 8 exhaust for split ratio applications) orindividually Note: Specify stud 88400 (3/8) or 88401 (7/16) whenordering. Can be ordered N.S. without sure-locksFor technical support call 619-661-6477 or visit www.crower.com

Aluminum Stud Mounted RockersALUMINUM STUDROLLERIZEDROCKERSCrower’s Enduro aluminumstud mount rocker armsare fully CNC machinedfrom USA made, premiumaluminum extrusion. Crower’s unique “full arch” design reduces therocker flex found in other brands. Results are increased rpm, greaterarea under the lift curve and added spring clearance. Double-step,serrated pins feature our rotor clip design that eliminates pinloosening. USA made needle bearings. When vertical valve coverclearance is an issue, specify “LP” when ordering. Will clear 1.625"diameter 72848-12*72847-12*AMC 290-401 V8AMC 290-401 V8AMC 6 cyl.AMC 6 08-16Chevy II 4 cyl.Chevrolet 230 250 292 6cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 230 250 292 6 cyl.Chevrolet 200 229 90 V6Chevrolet 200 229 90 V6Chevrolet 200 229 90 V6Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 V8Chevrolet 396-454 816-1672815-1672817-1672819-16Ford 289 302 351 W V8Ford 289 302 351W V8Ford 289 302 351W V8Ford 289 302 351W-351-N V8Ford 289 302 351W 351-N V8Ford 289 302 351W 351-N V8Ford 289 302 351W 351-N V8Ford 289 302 351W 351-N V8Ford 289 302 351W 351-N V8Ford 289 302 351W 351-N V8Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 460Ford Boss 351C 400 429 1672824-16Pontiac V8Pontiac V8Pontiac V8Pontiac V8Pontiac V8Pontiac AMCCHEVROLETFORDPONTIACOLDSMOBILE72844-16 Oldsmobile 67-91 V8* Requires machine workCan be ordered N.S. without sure-locksALUMINUMCENTERLINEROLLERIZEDROCKERSWhen installing a .100" long valve, the rocker arm tip must bebacked up .050" to ensure centerline contact at half lift. Croweroffsets the rocker stud hole in the trunnion, pulling the rocker tipback into correct alignment with the valve stem. Re-establishingcorrect geometry reduces valve guide wear and promotes moreaccurate valve timing. Will clear 1.650" diameter 96-872895-872897-872898-8DescriptionRatio StudChevrolet 265-400 V8 (set 8) 1.5 7/16Chevrolet 265-400 V8 (set 8) 1.55 7/16Chevrolet 265-400 V8 (set 8) 1.6 7/16Chevrolet 265-400 V8 (set 8) 1.65 7/16Chevrolet 265-400 V8 (set 8) 1.7 7/16Chevrolet 265-400 V8 (set 8) 1.75 7/16Chevrolet 265-400 V8 (set 8) 1.8 7/16Chevrolet 396-454 V8 (set 8) 1.7 7/16Chevrolet 396-454 V8 (set 8) 1.8 7/16The above rockers come in sets of 8 to mix ratios.Can be ordered N.S. without 843X1-872871X1-8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 V8Chevrolet 265-400 37X1-872838X1-8FORDExample B.350 Lobe Liftx 1.7 Rocker Ratio.595 Gross Lift-.020 Lash.575 Net Valve LiftCrower has a .150" offsetaluminum rocker availablein 7/16” stud diameteronly. These rockers includethe same features as ourEnduro Aluminum rockers,but in an offset design. Order only for the intake and then 8 onlystandard stud mount rockers on the exhaust (see p/n at 16Ford 289-302-351W 351N V8 1.6Ford 289-302-351W 351N V8 1.65Ford 289-302-351W 351N V8 1.7Ford 289-302-351W 351N V8 1.5Ford 289-302-351W 351N V8 1.55Ford 289-302-351W 351N V8 1.75Ford 289-302-351W 351N V8 1.87/167/167/167/167/167/167/16CHEVROLETReduce cam and lifter break-in failures by running Crower’s newbreak-in rocker arms first. Features a reverse offset trunnion(.050") that repositions the pushrod closer to the stock position. Inother words, Crower moves the rocker arm and pushrod forward.050" for easier installation. Current break-in rockers on themarket only offer center trunnion stud hole positions that requireextensive cylinder head modifications to the pushrod hole in orderto achieve proper pushrod and head clearance. Crower’s break-inrockers drop on with no machine work required. Spring pocketsmachined for 1.560" O.D. springExample AOFFSETALUMINUMINTAKEROCKERSPart#BREAK-IN ALUMINUMROLLERIZED ROCKERS.350 Lobe Liftx 1.2 Rocker Ratio.420 Gross Lift-.020 Lash.400 Net Valve LiftAs you can see in example (A), net valve lift is .575"and example (B) is .400" net. Depending on springrate, this could be as much as 100 lbs. or morereduced open pressure.Part#DescriptionRatioStud72881-16 Chevrolet 265-400 V872886-16 Chevrolet 265-400 V872882-16 Chevrolet 396-454 V81.21.351.47/167/167/1672884-16 Ford 289 302 351W V872885-16 Ford 351C V81.31.337/167/16CHEVROLETFORDSLEEVES72921Sleeves 3/8 to 7/16 For RockersNote: These rockers come 8 only for the intake side. You must order8 only standard design rockers for the exhaust side.Can be ordered N.S. without sure-locksNEEDLE BEARING TIP OPTIONAll Crower stud and shaft mount rocker arms are available with Crower’s new needlebearing roller tip option. Results are greatly reduced friction for added horsepowerand reduced valve guide and valve stem wear. The lighter tip delivers greater valve control for increased rpm andimproves valve spring longevity by decreasing heat over traditional non needle designs. Specify #73715R option forstainless steel (stud or shaft) or #72915R option for aluminum (stud or shaft) when ordering rocker arms. Notavailable on self-alinging tip designs.For technical support call 619-661-6477 or visit www.crower.com149

Stud Mounted Rocker PartsABCDALLOY ROCKER STUDSCrower screw-in rocker studs are rated to 190,000 p.s.i. tensile strength and insure reliability in yourvalve train. Machined and finished from 8740 aircraft quality steel and heat-treated formaximum strength. All threads are cold rolled for concentricity and extreme 1688401-1688425-16Chevrolet 60 V6 2.8-3.1 (80-94)Chevrolet 265-400Chevrolet 265-400Chev 265-400 & 396-454Chevrolet (Special appl. .175”)Chevrolet 396-454 (Alum hevrolet 396-454 (Alum Hds Ex. only)Chevrolet Late Model VortecChev Late Mod/Mark VFord 302, 351CDodge Magnum V6Dodge Magnum V8Dodge Magnum Truck 2001-2002Dodge Magnum Truck 2001-2002Dodge V10 MagnumDodge Viper V10Notes:(a) Reuse factory guide plates with 3/8 mounting hole.(b) Certain model years require 3/8 thread.(c) Certain model years require 5/16 3/810mm7/163/87/167/167/167/167/168mm3/8 (a)7/165/165/168mm3/8(b)5/16 .800”0.800”SURE LOCK ROCKER NUTSMade from high quality, heat treatedchromoly steel, Crower sure lock nutsallow for precise adjustments. Includesnuts, Allen head set screws.Part#Stud Dia.86050-1686050S-1686051-1686051S-1686052-127 167 163 83 83 8ShankDia.600".600".530".530".530"EngineV8V8V8V86 cyl“S”indicates short (.865") design for valve cover clearance.Std 1.060""S" Short - .865"Standard - 1.060"Gregg Scott Racing Engines and Tommy Keeter of KPE Enginessay Crower is the best shaft rockers on the market !For technical support call 619-661-6477 or visit www.crower.com

Stainless SteelShaft Mounted Rocker ArmsFor those of you that feel most confidentrunning a steel based valve train, we offer youthe Crower collection of shaft mountedstainless steel rocker arms. Each and everyconfiguration has been religiously scrutinized tooffer extreme rigidity and accuracy whileoptimizing moment of inertia phenomenacondition. Crower engineers made ease ofinstallation and maintenance a top priority soyou’ll never waste a moment when time iscritical at the track. Our stainless steel shaftrocker systems are a perennial favorite of dirtlate models and marine endurance competitors.Sustained high temperature has little effect onthe strength properties of stainless steel socomponents made from this material shouldhave a longer life expectancy than similarcomponents made from aluminum.Offset Guide.200"-.250"Offset RightStraight.350"-.550"Offset Right.550" Available onarm lengths 1.480"and overROCKER ARMSNEEDLE BEARING TIP OPTIONNew for 2015 the EnduraMax1/2 Valve lift roller tip should beon the middle of the valve.Bushing option in rocker tipsVALVE90 90 #73715BBNEEDLE BEARING TIP OPTIONAll Crower stud and shaft mount rocker arms are availablewith Crower’s new needle bearing roller tip option. Resultsare greatly reduced friction for added horsepower andreduced valve guide and valve stem wear. The lightertip delivers greater valve control for increased rpm andimproves valve spring longevity by decreasing heat overtraditional non needle designs. Specify #73715R optionfor stainless steel (stud or shaft) or #72915R option foraluminum (stud or shaft) when ordering rocker arms.NEEDLE BEARING TIP OPTIONREGULAR ROLLER TIP#73715RFor technical support call 619-661-6477 or visit www.crower.com151

Stainless SteelShaft Mounted Rocker ArmsBrodix BB-3 xtraDart Pro 1Ford Trick Flow152World Products LS-7XFor technical support call 619-661-6477 or visit www.crower.com

Stainless SteelShaftMountedRockerSystemsAFRSteel Billet Rockers AvailableFor All Popular ApplicationsArmLength1.450IntakeOffset.00074139F pattern Eliminator Street Head74132F SBC 215 RR74141F SBC 227 & 235 Eliminator 60/4074148F SBC 245 EliminatorAFR 345 VERSION 1 , used with74718F BBCsmaller diameter pushrods1.4501.4801.4501.4501.650.250.450.350.450 w/offset lifter.550.100.100.100.100.25074707F* BBC AFR 325/345/357 VERSION 21.650.100.000Part#Description74101F LS1SBC 180cc thru 220cc w/L-98 boltExhaustStand I.D. # Stand Part #Offset.000108.F74400X108F74717F BBC AFR 377ec 2401.650.000.10074140F SB Ford #165 - 225 .100 Valve .700 Lift74140XF SB Ford #165 - 225 .100 Valve -.700 6F74164F74107F74112F74126F74127F 74122F 74136F74124F 74018F74018B74129F74125F 12F210F Intake211F Exhaust227F Intake219F 0X031F74400X085FALL PROArm Intake Exhaust Stand I.D. # Stand Part #DescriptionLength Offset OffsetLS Series LSW 12 Hurricane 1.550.450.050032F74400X032FSBC 23 40/601.480.450.175021F74400X021FSBC 17 1.650.450.175013F74400X013FSBC 13 1.650.550.150023F74400X023FSBC 272-21 & 280-22 Billet1.650.750.250023F74400X023FArm Intake ExhaustStand I.D. # Stand Part #Length Offset OffsetChev Lil Brodie 90 V-6-101.550.300.175001F74400X001FLS Series STS BR-7 BS1.550.450.050032F74400X032FLS Series STS BR-7, Machining req. 1.550.350.050007F74400X007FSBC –8 through –111.480.250.100020F74400X020FSBC 10x 11x 40/60 & ASCS1.480.250.100021F74400X021FSBC 10x 11x 40/60 & ASCS1.480.450.100021F74400X021FSBC –12 RP LA 40/601.650.500.250023F74400X023FSBC –12 RP LA 58/1071.650.550.250023F74400X023FSBC –12 RP LA 70/1251.650.550.250023F74400X023FSBC 13 Clements Head1.650.550.250012F74400X012FSBC 13 Clements Head Billet1.650.650.250012F74400X012FSBC 18̊ Clone1.480.550.250021F74400X021FSBC 18 Clone LA1.650.550.250013F74400X013FSBC 18x 40/601.480.250.100021F74400X021FSBC 4.500 Bore Spacing 11 Steel Billet 1.650.650 .170/.270004F74400X004FSBC 4.500 Bore Spacing 13 Billet1.650.600.250009F74400X009FSBC Dragon Slayer DS225cc 23 1.480.250.100052F74400X052FSBC GB-2300 & GB-2000 Billet1.650.750.250023F74400X023FSBC Headhunter 23̊ 225-234cc1.450.450.150021FT74400X021FSpec SP CH1.480.150.100014F74400X014FSBC Track I,SBC Track 1x 40/601.480.250.100021F74400X021FSBC Track 1x STS T1 STD 233, STS T1 245 1.480.550.100021F74400X021F204F Intake 74400X204FBBC BB-1, BB-2, BB-2 plus / Race Rite 1.650.100.000208F Exhaust 74400X208F202F Intake 74400X202FBBC, BB-2X, BB-2xtra, BB-31.650.100.000205F Exhaust 74400X203F206F Intake 74400X206FBBC BB-3 XTRA1.650.100.000207F Exhaust 74400X207F218F Intake 74400X218FBBC Head Hunter 3831.650.100.000219F Exhaust 74400X219FBBC Head Hunter218F Intake 74400X218F1.650.100.050383-395MC219F Exhaust 74400X219F141F Intake 75400X141FBBC SR20 Billet1.850.000.000142F Exhaust 75400X142FSBF Track 1 351 Spec1.480.000.000085F74400X085FDescriptionLA Long Arm Optional offsetRatios over 1.8 may require a long arm rocker arm. Arm lengths over 1.650 are available in aluminum or steel billet. 74400X014FNew for 2015 the EnduraMaxBushing option in rocker tips#73715BBNeedle Bearing Tip Option#73715RNOTE: I.D. numbers are stamped onall mounting base stands. When you areordering your replacement base standplease reference this I.D. number to ensureyou get the correct part.Most shaft rocker assemblies areavailable with optional offsets. Ifyou don’t find the offset you require,please ask about availability.Note: Part numbers ending in "B"have steel billet rocker bodies.* One piece intake stand, nomachine work required.For technical support call 619-661-6477 or visit www.crower.com153

Stainless SteelShaft Mounted Rocker SystemsSteel Billet Rockers AvailableFor All Popular 4145FBMFArm Intake ExhaustStand I.D. # Stand Part #Part#DescriptionLength Offset Offset74178F SBC 18 705 BBC BMF 385 1.650.100.000220F Exhaust 74400X220F201F Intake 74400X201F*74705 BBC BMF 350 1.650.100.000220F Exhaust 74400X220FArm Intake ExhaustStand I.D. # Stand Part #Length Offset OffsetSBC 23 4001.480.100.100020F74400X020FSBC Small Runner1.480.250.100020F74400X020FSBC Large Runner1.480.450.100021F74400X021FSBC 23 2201.480.450.100024F74400X024FSBF Model #20450 Windsor 4104F74105F74112F74111F74112F 74152F74113F74127F74117F 9F74710B74156F* One piece intake stand, no machine work required.New for 2015 the EnduraMaxBushing option in rocker tips#73715BBDARTArm Intake ExhaustStand I.D. # Stand Part #DescriptionLength Offset OffsetSBC Pro 1 227, 23 1.480.300.200052F74400x052FSBC Pro 1 Platinum 227 .100 valve CNC ports 1.480.350.175052F74400X052FLS3, L92 & Dart #110300501.450.175.000105F74400X105FSBC Pro 11.480.250.100020F74400X020FSBC Dart II Sportsman1.480.100.100020F74400X020FSBC Dart II Sportsman1.480.250.100052F74400X052FSBC 230 Iron Eagle1.450.350.100052F74400X052FSBC Iron Eagle .300 valve1.480.300.200027F74400X027FSBC 23 RR 40/601.480.450.100021F74400X021FSBC15 , 16 , 18 Clone LA1.650.550.250012F74400X012FSBC15 , 16 , 18 Clone1.480.550.250020F74400X020FSBC 12.5 1.650.550.250012F74400X012FSBC 4.500 Bore Spacing 9 Billet1.650.650.250019F74400X019FSBC 4.400 Bore Spacing 9 Billet1.650.650.250018F74400X018F100F Intake 74400x100FBBC Pro 1 310/325/3451.650.000.000101F Exhaust 74400x101F100F Intake 74400x100FBBC Pro 1 CNC 335/355 & Pro 2 3801.650.100.075101F Exhaust 74400x101F104F Intake 74400x104FBBC Race series 320-3601.650.000.075101F Exhaust 74400X101F100F Intake 74400X100FBBC Big M1.650.000.000212F Exhaust 74400X212F.100196F Intake 75400X196FBBC Race Series 18 Oval Billet1.850.000.150197F Exhaust 75400X197FSB Ford Pro I CNC 225 4.155 Bore1.450.000.000085F74400X085FNeedle Bearing Tip Option#73715RNote:The shaft rocker part numbers listed are madeto the manufacturers max lift configurations. Ifyour application has modifications, such as longervalves for higher lift, it may require customizationto maintain correct geometry. Please specify whenordering.Most shaft rocker assemblies are available withoptional offsets. If you don’t find the offset yourequire, please ask about availability. LA Long Arm Optional offsetRatios over 1.8 may require a long arm rockerarm. Arm lengths over 1.650 are available inaluminum or steel billet.NOTE: I.D. numbers are stamped on all mountingbase stands. When you are ordering yourreplacement base stand please reference this I.D.number to ensure you get the correct part.154For technical support call 619-661-6477 or visit www.crower.com

Stainless SteelShaft Mounted Rocker SystemsSteel Billet Rockers AvailableFor All Popular 4128F74117F74186FSBC PerformerSBC Victor Jr.SBC Victor 18 SBC Victor 18 LAS.B.C. head 61229*74704F BBC RPM Perfomer*74724F BBC Victor 24 74156F SB Ford Victor Jr.74163F Pontiac 326-45574165F Pontiac 326-455Arm Intake ExhaustStand I.D. # Stand Part #Length Offset take74400X204F1.650.100.100208F Exhaust 74400X208F216F Intake 74400X216F1.650.000.100217F Exhaust 060F74400X060F1.480 specify specify060F74400X060FGM CASTINGSPart#Description74101F74105F74107F74218F 74111F74119F74128F74117F 74151F LS1-LS2-LS6LS3 & L92LS7 Machining RequiredV6 18 LASBC Iron & BowtieSBC Phase 6 Alum. BowtieSBC 18 SBC 18 LASBC GM LA (1.8:1 to 2:1)*74700F BBC Iron casting74122F 74126F74127F 74163F74166F74169FPontiac/SBC 15 LAPontiac/SBC 23 867 40/60Pontiac/SBC 23 867 40/60Pontiac BB 326/455Pontiac 18 #10093391Pontiac Kauffman HeadDescription74106F74108F74109FLXR - LS-7 4.0 BoreLS-7 4.100 BoreLS-7 4.000 Bore

to the outside diameter of the exhaust valve diameter. Subtract .341" from that to get the centerline distance from exhaust to intake valve. Note: .341" diameter is based on 11/32" intake and exhaust valves. Some cylinder heads have different size intake stems. Make sure you measure valve stem size before measuring valve centerline. 2.

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