Diesel World – October 2019

Oncethevalvespringsarelockedinplace,Fleece’stechsmoveontothenextcylinder.

It’sworthnotingthatHamilton’s103-lbspringsarea wiseinvestmentanytimeyou’re

buildingmorethan35-to-40psiofboostorelevatedrpm.Whilevalvefloatis alwaysa

concernwiththefactoryCumminsspringsoperatingathighrpm,valvecreep—wherethe

intakeandexhaustvalvesareblownopenbyexcessiveboostand/ordrivepressure—is

alsoa majorworry(aswellasa commonoccurrence),whichcancontaminatethecylinders

duringtheengine’sintakestroke.Withthesespringsinthemix,noneofthatis a problem.

Asa finalpointofvalidation,a vacuumtestis performedoneachindividualvalve.This

all-importantstepensuresa precisevalve-to-seatsealexists.Oncetheheadpassesthe

vacuumtest,it’spreppedtobepackagedandsold.

Onitswaytopackaging,FleeceaddsonelasttouchtoitsPerformancehead.Tocleanuptheboltholes

fortheexhaustmanifold,a tapis runthrougheachboltbore.Whethertheend-userneedstogethisorher

truckbacktowork,thetrack,orthedyno,Fleecehasgonetogreatlengthstoensuretheinstallationofits

Performanceheadis aspainlessaspossible.

Insidethespecially-builtwoodcrateeachPerformanceheadshipsin,you’llfinda fire-ringheadgasket

kit,whichincludesa 4.550-inchx 0.105-inchmulti-layersteelgasketandtherequiredmildsteelfire-rings.

Inanefforttosimplifyitscorereturnpolicyforresidentialcustomers,FleecehaspartneredwithFastenalfor

convenientfreightservicesfrommanyofitsnationwidelocationsatanapproximatecostof$100.

JustlikeitsStreetserieshead,Performanceversionsalsoreceive

anIDtagwitha serialnumberlistedatthebottom.Eachheadis

permanentlyloggedintoFleece’sdatabase,sothespecificdetailsof

thebuildcanbesenttoa secondorthirdpartyshouldtheheadever

changehands.

Whetherit’s

headedtoa supplier,

anothershop,a

personalresidence,

ortoFleece’sdrive-in

servicedepartment,

allthat’slefttodo

nowis boltit onand

go.Witha goalof

keepingtheseheads

ontheshelfatall

times,Fleeceaimsto

supplytheindustry

witha high-quality,

highlydurable,

competition-ready

headthatsupports

1,100hp.

TECH COMPETITION-READY, OFF-THE-SHELF AVAILABILITY

84 OCTOBER I 2019 • DIESEL WORLD http://www.dieselworldmag.com