This GEN 3 Hemi was built by our shop F.I. expert, Ben Hoitink, for his ‘75 Duster street machine.  The engine is built to have a wide flat torque curve for easy cruising.

The standout feature is the 2 x 4 fuel injection system.  The basis is the Edelbrock GEN 3, 2 x 4 carb intake (P/N 7528).  The throttle bodies are 2 Holley P/N 112-577.  Ben fabricated his own throttle linkage, the throttle bodies work in unison, and the secondaries start opening at about half throttle.  Ben installed injector bungs in the manifold.  The Holley wiring system was used without modifications.  Holley’s #1 F.I. expert, Rick Anderson, was on hand to make sure we did everything properly as this is the first 2 x 4 injector system—on a HEMI at least for Holley.  The engine was a 5.7 with our 392 stroker kit (P/N 5.7 HEMI stroker kit).  The heads were the same vintage 5.7 head with full CNC porting, stock valve sizes and our high flow valve job.

The Hughes SteamRoller cam was an HUG SER2731MHLN with a 111° LSA.  As you can see, both the torque and HP curves were very nice: wide and flat, the kind you would like to see in a very hot street “cruiser”.  The vacuum @ idle (750 rpm) was 13”.  The torque (that makes it fun on the street) was 450#/ft. or more from 3200 to 6100 with a peak of 518 at 4800rpm.  This pussycat is ready to shred the tires at almost any rpm. The horsepower peak was 529 at 5700rpm, but the horsepower was over 400 from 4200 to 7000 RPM. The horsepower and torque held up well past their peak numbers - not something you see with wedge engines.  Notice how the Horsepower only dropped about 21HP from the peak @5900 to 6800 – not something you will see in a wedge. Reminds me of the song by the Vanilla Fudge in the 60’s “You keep me hangin’ on”

Holley HP EFI
HP ECU #554-113
Throttle bodies 1000 CFM 4150 #112-577
5.7 heads, fully CNC ported, stock valve size
SER2731MHLN-11° SteamRoller Cam
5.7 HEMI Stroker kit
Edelbrock 2x4 Intake 7528

Hughes dyno tests