dart`s n ew iron eagle heads anchor a major bolt

dart`s n ew iron eagle heads anchor a major bolt

+ i'n"
f-'t,i
offeringus new technologyfor 4.6-powered
DART'SNEW
Mustangs,so you can imaginehow excited
'Stangbangers your
OG
like
tech editor
IRONEAGLEHEADSand
EditorSteveTurnerget when we hear
ANCHOR
A MAJOR aboutanythingnew for good ol' 5.0-liter
engines-the bulletsthat helpedlaythe
BOLT-ON
5O
groundworkfor the Mustangmadnesswe
all thrive on today.
POWERGAIN
Dart Machineryis recognizedby
cast-ironcylinderheads,at that. Dart's
Windsor andWindsorJuniorheadswere
amongthe limitednumberof must-have
Fox Mustangperformanceparts back
in the day.The5.0 in your tech editor's
'84
nitrous-injected
GT sporteda pair of
that
helped
carry the street/strip
Juniors
'Stang
to lO-seconde.t.'sin the mid '90s.
The heads'compositionmadethem
eepingtrack of all the high-flowing Mustangracersand enthusiasts
as the
much heavierthan the all-hallowedalucylinderheads,high-rewingcam- makerof the lron Eagleseriesof 302 and
minum headsthat haveruled the 5.0
shafts,and high-performance
35lW engineblocks.Thecompanyis betroost sincethe mid-to-late'90s.Desoite
cold-airsystemsavailable
for
ter known for its blocksthan for producing that, high-volumeports, larger valves,and
Two-,Three-,and Four-Valve
small-blockFord cylinderheadsway back
combustionchamberimprovements(over
'Stangs
is no easytask in our predominately in 'Stangbanging's
early years.
Fords ETTEs)enabledDart's headsto flow
modularworld. Manufacturers
are constantly
That's right:cylinder heads-and
a lot of air.Whencombinedwith camshafu
Text by KJ Jones
Photoscourtesyof Greg and HannahMontoya
A DartMachinery's
new lronEaglecylinderheadshighlight
GregMontoya's
H/C/lswap.Thecast-iron
heads(PNI 3301182; $1,053.95)
featurebeautifully
radiused,
1.17S-inch
widex 2.050-inch
tall,180ccintakeportsthatflow 247 ctm
at 0.500-inch
lift.
ANot bad,for DlY.That'sright:Thisis the stock5.0thatwas nestledbetweenthefrontfendersof Greg's
'Stang
at the outsetof ourproject.Gregbuiltthis enginehimselfafterscoringthe caras a rollerin a multileveltradedealthat rivalsthatof professional
athletes.
We'restilltryingto figureoutthe details,but based
'89
on the appearance
of the clean,white
Gl the carwill be a coolstreetcruiser,
andhopefully
a Ponythat
will holdits own on the trackas well.
AMarkingthe rotor'spositionat top deadcenteris
procedure
an important
disassembly
whenyou're
swappingcamshafts
andintakemanifolds.
The
distributor
mustbe removedunlessyou'reonly
changing
the intakemanifold.
Makingthisreference
ensures
the distributor
is reinstalled
at the same
positionin thetrmingsequence,
andthe engine
shouldfirerightup.
A0nce allol the necessarv
disconnections
are
made,Gregliftsthe lowerintakemanifold
fromthe
block.Thestockfuelrailsand19-lb/hrinlectors
can
remainin placeduringthisstep.They'llbe replaced
with BBK'sbigfuelrailsand24lb/hrinjectors,
whichGregwon in an eBayauction.
7A
5.O AUGUST
2(,(,a
APullingthe stockheadsrequires
somemuscle,as
will loweringDart'snew ironheads.Gregactually
usedheadsfroman'87 302 (E7lfor hisrebuild.
At
1.05incheswidex 1.90inchestall.the intakeDorts
on the stockheadsareconsiderably
smallerthan
thoseon the headsbeingusedfor ourupgrade.
and intake manifolds that comolement
their capabilities,they sent many streetand drag-race'Stangs into the low-e.t.
zone for a relatively small monetary and
time investment.
Fast-forward to today, and Dart is once
again giving us a good reason to be interested in its cylinder heads.No, there hasn't
been any improvement in its Pro-l CNC
aluminum heads.What we're amoed about
are Dart's new cast-iron heads,whichsimilar to its popular blocks-are also
called lron Eagle.
Once again we're exploring the performance capabilitiesof heads/cam/intake
combinations for 5.0 Mustangs.Howeven
unlike other reports we've done on this
topic that feature H/C/l packages offered
by manufacturers,we've compiled pieces
from individual companies we think make
up a compatible, affordable packagethat
will do well on a stock Fox Mustang engine.
The lron Eaglesare flying at the front
of this effort, along with a street/strip N-41
(Continuedon p.85)
AAs H/C/lswapsgo,we'veevaluated
formthat average
combinations
soldin package
$3,000.Forthis
(PN1706;
project,we selected
Dart'slronEaglecylinderheads;a BBKPerformance
fuel-pressure
regulator
kit (PNI 557;$165.95),anda single-stage
intakemanifold
systemthat includes
a 7Omm
$99.95),cold-air
throttlebodyandfuelrails(PN5002;$559.95);
andAnderson
FordMotorsports'
N-41camshaft(PNAF-N41;
NotshownareHarland
Sharp'snew Diamond
Series1.6ratio,%e-inch,
stud-mount
rollerrocker
$29S.00).
arms(PNSD4003-7;
steppedheadbolts{PN254-3708;
$177.161
$365.00)andthe ARP%- to1/z-inch
required
for installing
the lronEagles.
AUsinga littleRoyalPurpleMax Tuffas a prelube,
the new camshaftis stabbedin place.Theprelubeisn'ta
requirement
with a hydraulic-roller
camshaft,
but it makesGregcomfortable.
r
:iS
{l
!I
A S i n c ethe 302short-block
hasonly220miles
sinceits rebuild,
the double-roller
timingchainand
-rollerliftersarereusedfor thiscamswap.
hydraulic
Alron Eagles'exhaust
portsalsoblowawaythoseof stock5.0heads.Theseportsmeasure1.325inches
widex 1.350inchestall,flowing159cfm at 0.500lift.We digthe standard
exhaustboltpattern,which
allowsGregto staywith shorttubesor eventually
boltup anystandard
long-tube
Fox-body
headershe
desires.
o
)
AThis is a closelookat the 58cccombustion
chamberof Dart'snew lronEaglecylinderheads.
Theheadsfeature1.94{intake)/I.60
(exhaust}
stain.
lesssteelvalves,whicharetotallycompliant
with
the engine's
stockpistonsandthe newAnderson
camshaft.
Thevalvesarealsoavailable
with 2.02
intakevalves.Dartflat-millsits lronEagles0.006
inchpercubiccentimeter,
andit anglemillsthe
heads0.0075inchpercubiccentimerer.
5.O AUGUST
2()0a
AStockheadboltscan'tbe usedto installDart's
lronEaglecylinderheadson a standard
8.2-deck
blockbecause
theyrequirea %-inchbolt.ARP's
steppedhead-bolt
kit is calledintoactionandGreg
torqueseachfastener
with 75 lb-ftof toroue.
AAfter installing
the %rinchstudsincluded
with
the lronEagles,
Gregtoppedoff the new headswith
16 of Harland
Sharp'sDiamond
Seriesrollerrockers.
Perthe AFMcam card,we'restayingwith a 1.6
ratiofor the rockers,
andas usualwith a hydraulicrollercam,lashis adjusted
t0 zero.The1.437-inch
doublespringsandsteelretainers
on the headsare
included,
but the stockoushrods
arereusedwith
thrssetuD.
) Before
positioning
the BBK
SSISeries
intakeon
the engine,
its lower
intake
must
be preassembled
with the
high-flow
Iuel rails,
regulator,
crossover
tube,and
all of the variousEECsensors.Thislowermanifold
leatureslongequal-length
runnersthat depositairl
Iuel into a huge,openplenumarea.Basedon the
intake'soveralldesign,we thinkit shouldwork
well with the headsand our selectedcamshaft.
A BBKincludestwo O-ringsfor the fuel crossover
tube. However,dueto the tube'slocationbelowthe
uppermanifoldandthe difficultyGregwill havetryingto accessthetubeoncethe upperis installed,
he addstwo additional
0+ings(oneon eachside)
for addedinsurance
againsta possible
leak.
AThe engine's
original
vacuumT mustbe trans
fenedto the bossin the SSIupperintake.
A Beforeloweringthe uppermanifold,the main
enginehamessandotherwiringmustbezip-tied
and movedcompletelyout of the way. TheSSI
upperis a lot bulkierthana stock5.0's,so the more
clearanceyou havewhen installingit, the better.
a2
5.OAUGU6T20(,8
Awith the lowermanr
SSIt
radicaldual-plenum
the
its wild appearance,
ing and built-inEGRspa
tl
featureson this intake
ar
the oEM valvecovers
coverboltsaretoolong
a shim is addedto each
andnix1
ancedifference
ing a majoroil leak.The
vacuumhoses,andsen
once the upperintakeis
g
AThis plenum-cove
placebeforethecoveri
ing screwsfor theplat
to i
a crisscross
Pattern
f
I I
AWiththelowermanilolddown,Greqinstallsthe
l a d i cdaul a l - p l e n u
Sm
S Iu p p e irn t a k eI.n a d d i t i otno
tuwildappearance,
the 75mmthrottle-body
0pen
ing
a n db u i l itn E G Rs p a c ear r ea c o u p l e
o f t h eo t h e r
leatures
onthisintakethatwe thinkarecool.Notice
lheoEl\il
valvecoversarern place.Thestockvalve
cover
boltsaretoo lonqfor the lronEagleheads,so
r sa d d e dt o e a c hb o l tt o m a k eu p t h ec l e a r
ashim
a n cdei t f e r e nacnedn i xt h ep o s s i b i l iot yf e x p e r i e n c inqa maloroilleak.Thethrottlecable,PCVvalve,
v a c u uhm
o s e sa,n ds e n s o rasr ea l s or e c o n n e c t e d
once
theupperintakeis installed.
t u s tb e s l i p p e idn
l l h i s p l e n u m ' c o vgears k em
place
before
the coveris installed.
Gregsaysmountinqscrews
for the platemustbe tightened
evenlyin
patternto avoida vacuumleak.
acrisscross
l s i n c et h ef a c t o r yt h e r m o s t ahto u s i n g
onGreg's
h a ds e e nb e t t e rd a y s w
5.0
, e d e c i d e tdo u p g r a d e
w i t thh i sc l e a n15 - d e g r epei e c e( P N10 6 6 )f r o n r
P e r f o r m aSntcaer n l e sSst e e lT. h eh o u s i n g
is made
hom
C N C ' m a c h i n3e0d4s t a i n l e sasn ds n u g su p
t 0t h en e wm a n i f o lw
d i t h t h e i n c l u d eC
d ometic
gasket.
t eKdc o l d - a sr ry s t e n r
l A f e n d e r w e l l - m o uBn B
outtheupgrade
components
we'reusingon
j ounds
Pony.
ThehighJlowconicalairfilteris in the
] 0reg's
andair is channeled
up throughan 80mm
| lender,
C 8m
L a s sa i rh o u s r ntgh a tf e a t u r eas s a m p l i ntgu b e
sbedfor
241b/hrfuelinjectors.
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I
I
l'onttnued
ftom D.78)
hydraulic-rollercamshaft from Anderson
FordMotorsport and high-flowing intake
components(SSl Series manifold, 70mm
throttle body, and a cold-air induction system) from BBK Performance.
We know your thirst lies in how much
power the assortment makes,so we won't
dawdletoo much on the installation of this
bolt-on package.The accompanying photos and captions illustrate highlightsand
notes on the install from our buddy Greg
'Stangbanger
Montoya,a do-it-yourself
who
was readyto takethe bone-stockpowerplant(savefor short-tubeheaders)in his
'89
MustangGT to a budget-friendly
but
better levelof oerformance.
Greg handledthe partsswappingin
a few eveningsat his home garageafter
work.As you'll seewhen you readfurther,
the H/C/l packagewe selectedproved to
be well worth his time and the impressively
small monetary investments.
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