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Ford 4.0L 6 Cylinder SOHC and DOHC 698GT-A Series 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, so 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 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 to suit.
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 698
(935HP) and for the seriously power crazed, our
998GT-A Engines (998/1330HP) are just the
ticket!
MY2011 Atomic 698GT-A Long engine specs
Ultrasonic tested block
in 24 spots per block thick walls are required
(we reject 4 in 10 for being like Cleveland
blocks - too thin in spots due to core shift)
Full crankshaft preparation - magnafluxed,
checked for index/stroke, 2 stage Heat treatment
(normalise/stress relieve and temper),
reground/indexed as required, micropolished
journals and chamfered oil holes.
Cosworth F1 Series pistons 8.5:1 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 Superleggera conrods #306200
698kW 6.060 C/C, bushed for floating pins,
ARP 2000 bolts, cylindrically ground/honed
tunnels and pressure fed gudgeons - 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
Race spec clearances to suit the intended
usage
Fully prepped Stage 3 cylinder head with 7/7
angle CNC machined valve job and hand porting of
both inlet and exhaust. Fine Ra finish on deck
surface, chambers relieved and CCd, spring
tensions set up and new PC seals fitted.
Lifter preloads set for hi-RPM usage.
Atomic H/Duty Simplex timing chain
Atomic Induction hardened crank sprocket
Atomic Hi pressure timing chain tensioner
Precision balanced
Atomic Hi-Mass ANDRA/SFI approved harmonic
balancer
Atomic Race Spec H/D valve springs
Atomic Head stud kit - 12mm
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.
Microglide surface treated camshafts
Atomic gasket set inc SLS Teflon coated head
gasket and Viton crank seals
Fit new brass welch plugs
Spray block grey (or any other colour you
prefer)
Powder coated rocker cover your choice of 6
colours
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
24 months warranty
A long engine comes complete from sump to rocker
cover and all engines are run-in on our engine
test cell to ensure everything is 100% spot-on
before shipping.
Fitting one of our engines to a nonoriginal
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 cylinder
around!
And you also 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.
698GT-A Series New Long Engines
#306460 SOHC Ford 6 cyl - EB-EL Ford
#306461 SOHC Ford 6 cyl - AU Ford
#306462 DOHC Ford 6 cyl - BA Ford
#306463 DOHC Ford 6 cyl - BF Ford
#306464 DOHC Ford 6 cyl - FG Ford
#306465 DOHC Ford 6 cyl - Retrofit Series
698GT-A Series Long Engines - rebuilt from
your engine
#306460-RB SOHC Ford 6 cyl - EB-EL Ford
#306461-RB SOHC Ford 6 cyl - AU Ford
#306462-RB DOHC Ford 6 cyl - BA Ford
#306463-RB DOHC Ford 6 cyl - BF Ford
#306464-RB DOHC Ford 6 cyl - FG Ford
#306465-RB DOHC Ford 6 cyl - Retrofit Series
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