INSIDE FLEECE PERFORMANCE
ENGINEERING’S NEW CUMMINS
PERFORMANCESERIES HEAD
J
ustlikeanyshort-blockbuild,yourcylinderheadis onlyasgoodas
themachineshopthatputit together.Properinspection,precision
machiningviastate-of-the-artequipment,a goodvalvejob,andthe
company’strack-recordin theindustryallfactorintothedeal—es-
peciallyif you’rechasingfour-digithorsepower.For’03-presentCummins
ownerslookingto gobig,thereis a lotmoreto it thansimplyaddinghead
studs.Thefactory,crack-pronevalveseatsneedto beaddressedbeforethey
becomea majorproblem,stiffervalvespringsneedto beaddedto handle
elevatedrpm,drivepressure,andboost,andfireringsarerequisiteforutmost
combustionsealing.
Basedontheheadworkit wasregularlyperformingforitstruckpullanddrag
racecustomers,thefolksat FreedomRacingEngines—theenginebuilding
wingof FleecePerformanceEngineering—decidedto offera competition-
readycylinderheadfor24-valveCumminsowners.CalleditsPerformance
head,eachreconditionedunitcomesloadedwithsomeof thebestcompo-
nentsavailablein theaftermarket,alongwithitsfactoryweaklinksaddressed.
ItemssuchasHamiltonCams’103-lbvalvespringsandManleyPerformance
stainlessvalvescomestandard,asdoheat-treated,oversizevalveseats,
screw-infreezeplugs,fire-ringgroovesandthecorrespondingheadgasket.
Betteryet,Fleecehasthemontheshelfandreadyto shipat alltimes.
WhileFleeceratesitsPerformanceheadfor1,100-rwhp,similarlybuiltunits
havebeenusedonenginesmakingmorethan2,000hp.Fromusablecoreto
finishedproduct,joinusfora lookat thein-depthremanufacturingprocess
eachPerformanceheadundergoes.
COMPETITION-READY,
OFF-THE-SHELF
AVAILABILITY
76 OCTOBER I 2019 • DIESEL WORLD http://www.dieselworldmag.com
TECH|
DIESEL WORLD MAGAZINE BY MIKE MCGLOTHLIN