Ford 4.0L 6 Cylinder SOHC and DOHC Short Engines
Although we have been building high performance engines since 1978, it wasn’t until 2004 that we began development work on the Ford 4.0L DOHC 6 cylinder “Barra” turbocharged engine. We witnessed numerous catastrophic engine failures after consumers had undertaken simple modifications such as free flowing exhausts and cold air intake systems, so it became apparent there was a need for us to engineer some 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 because the engine internals are almost directly taken from the original inline 6 cylinder NA (normally-aspirated) engine of the 1960’s, 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). Following this various other engine weaknesses came to the fore such as oil pump problems, valvespring tension, excessive torsional moments, crankcase flex, inadequate cylinder head retention, airflow distribution problems at high boost etc and engineered a range of solutions to suit.

We have seen power levels in excess of 1350KW (1800+HP) with our engines and components, such is the scope for power from these big cube 6 cylinder power plants.

We have 3 power levels available; new for 2014 is our StreeTorquer 550 engine, designed for hi-performance street cars; the venerable 698GT-A engine has been upgraded for 2014 with a few new tricky bits and finally for the seriously power crazed, our 998 Series powerplants are just the ticket!

MY2014 Atomic StreeTorquer 550 Short engine specs

• Ultrasonic tested seasoned Ford block – the thickest possible 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.
• Atomic forged pistons – 8.7:1 comp ratio and include coated skirts, anti detonation bands and H/D pins
• Cosworth nitro carburised steel turbo rings
• Atomic billet StreeTorquer conrods #306202 550 Kw – 6.060” C/C, bushed for floating pins, ARP 2000 bolts and cylindrically ground/honed tunnels.
• ACL/King Competition bearings
• 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
• Atomic Induction hardened crank sprocket
• Precision balanced
• Fit new brass welch plugs
• Spray block grey (or any other colour you prefer)
• Precision blueprinting and assembly of short motor
• Supply detailed specs of completion of engine and run-in procedure sheet
• 3 months conditional warranty

Atomic engines and components are engineered, dynoed, track tested and warranted to give you confidence you won’t be let down in the heat of competition.

StreeTorquer 550 Series Short engines – Non exchange
#306380 DOHC Ford 6 cyl - BA Ford
#306381 DOHC Ford 6 cyl - BF Ford
#306382 DOHC Ford 6 cyl - FG Ford

StreeTorquer 550 Series Short engines – Exchange
#306379-RB SOHC Ford 6 cyl - AU Ford
#306380-RB DOHC Ford 6 cyl - BA Ford
#306381-RB DOHC Ford 6 cyl - BF Ford
#306382-RB DOHC Ford 6 cyl - FG Ford




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