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Ford 4.0L 6 Cylinder SOHC and DOHC 998 GT-R Long Engines
Although we have been building high performance
engines since 1978, it wasnt until 2004 that we
began development work on the Ford 4.0L DOHC 6
cylinder factory turbocharged engine. We
witnessed numerous catastrophic engine failures
after consumers had undertaken simple
modifications such as free flowing exhausts and
cold air intake systems to otherwise stock
vehicles, it became apparent there was a need
for us to engineer some hard core solutions to
address the inherent factory weaknesses.
 The engines possess an abundance of untapped
power with their large factory fitted Garrett
GT35/40 turbocharger; however as the engine
internals are almost directly taken from the
original inline 6 cylinder normally-aspirated
engine of the 1960s, so they were not designed
to handle 21st century boost-assisted power
levels.
We initially developed a lightweight yet durable
billet conrod to work with the 99.31mm (almost
4) stroke crank and before long our customers
were making 450+ RWKW (700+ flywheel HP) with
total reliability. Following this we pinpointed
other engine weaknesses, such as the oiling
system, torsional vibration problems, cylinder
head lifting, airflow distribution problems at
high boost etc and engineered a range of
solutions.
We have seen power levels in excess of 1000KW
(1300HP) with our components, such is the scope
for power from these big cube 6 cylinder power
plants.
We have 2 power levels available; our
698GT-A
Engines are designed to handle up to 698KW
(935HP) and for the seriously power crazed, our
998GT-A Engines (998KW/1330HP) are just the
ticket!
MY2011 Atomic 998GT-R Long engine specs
Ultrasonic tested block in 4 spots per
cylinder thick walls are required (we reject 4
in 10 for being like Cleveland blocks - too thin
in spots due to core shift)
Full Race Spec crankshaft preparation -
magnafluxed, checked for index/stroke, 3 stage
Heat treatment (normalise, stress relieve and
gas nitride), lightened counterweights, cross
drilled main journals, reground, indexed,
micropolished journals and chamfered oil holes.
Cosworth F1 Series pistons 8.5: comp
ratio and include coated skirts, anti detonation
bands, polished crowns, H/D pins and piston
crown cooling - an Atomic exclusive.
Totally silent operation.
Cosworth nitro carburised steel turbo rings
Atomic billet FatRods #306201 - bushed
for floating pins, ARP2000 bolts, cylindrically
ground/honed tunnels and pressure fed gudgeon
pins an Atomic exclusive.
ACL Competition bearings with extra oil feeds
for little end bushes
Fully machined block inc torque plate honed
cylinders, decked to crank centreline, main
saddle alignment checked etc
Deck surface CNC machined to accept 14.3mm
Atomic head studs
O-ringed block to suit copper head gasket
O-ringed cylinder head to suit copper head
gasket
Oversize ID head dowels
Race spec clearances to suit the intended
usage
Fully prepped Stage 5 cylinder head with
5-angle CNC machined valve job and porting of
both inlet and exhaust. Fine Ra finish on deck
surface, chambers relieved and CCd, spring
tensions set up, oversized head bolt holes and
new PC seals fitted.
Atomic Hi-Rev anti pump up lifters fitted and
lifter preloads set.
Inconel super alloy exhaust valves
Atomic H/Duty Simplex timing chain
Atomic Vernier adjustable Camshaft sprockets
Atomic Induction hardened crank sprocket
Atomic Hi pressure timing chain tensioner
Precision balanced
Atomic Hi-Mass ANDRA/SFI approved harmonic
balancer
Atomic Race Spec NASCAR valve springs - good
for 34+lbs boost
Titanium valvespring retainers
Atomic Head stud kit - 14.3mm
Atomic Billet gear oil pump complete with
EDM cut chrome moly gears, billet end plate
(hard anodized), Grade 10 fasteners, high flow
bypass circuitry and blueprinted clearances.
Atomic Duo-phased cams your choice of
profiles
Atomic gasket set inc Copper head gasket and
Viton crank seals
Fit new brass welch plugs
Atomic main cap support girdle and windage
tray
Spray block grey (or any other colour you
prefer)
Precision blueprinting and assembly of long
motor
Engine is fully test run in our engine test
cell - verify all vitals of the engine (oil
pressure hot and cold, ring bed-in, cylinder %
leak down, lifters bled, etc) and report
supplied.
Supply detailed specs report of engine and
run-in procedure sheet
Supply 8 litres of Castrol ProTec run-in oil
Supply genuine Ford oil filter
3 months warranty
The 998 is optioned up with the addition of our
famous FatRods, CNC machining of the block for
our whopping 14.3mm head studs, copper head
gasket, dual stainless O-rings per cylinder,
lightened and heat treated crank, different
bearing clearances, a main cap support girdles
and a set of our Race Series valve springs to
cope with high boost levels.
Fitting one of our engines to a non-original
application is no problem with our Retrofit
Series. No need to use the original Ford
computer, harness and gearbox, just hook up your
choice of turbo or blower, add your favourite
ECU and you will have the baddest 6 powered car
around!
And you have the option of either an engine
built to your requirements or we can rebuild
your own... the choice is yours!
Atomic engines and components are engineered,
dynoed, track tested and fully warranted to give
you confidence you wont be let down in the heat
of competition.
 998GT-A Engines
#306490 SOHC Ford 6 cyl - EB-EL Ford
#306491 SOHC Ford 6 cyl - AU Ford
#306492 DOHC Ford 6 cyl - BA Ford
#306493 DOHC Ford 6 cyl - BF Ford
#306494 DOHC Ford 6 cyl - Retrofit Series
998GT-A Engines rebuild your engine
#306490-RB SOHC Ford 6 cyl - EB-EL Ford
#306491-RB SOHC Ford 6 cyl - AU Ford
#306492-RB DOHC Ford 6 cyl - BA Ford
#306493-RB DOHC Ford 6 cyl - BF Ford
#306494-RB DOHC Ford 6 cyl - Retrofit Series
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