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6_Cyl_GM_4.2L
GM-350-350-EFI GM-350-260HP 6_Cyl_GM_4.2L


6 cylinder Rolls Bentley engine conversion
This conversion is for 1959 & older 6 cars.
GM 4.2L Twin Cam 24 Valve 291 HP in-line 6.

We are working on an "R" Type conversion for the older 6 cylinder Rolls & Bentley cars.
With 291 HP & Fuel-Injection this current model GM Engine & 4 speed Overdrive Automatic promises to be a real top quality replacement for your tired old 6.   It will not require destroying the Rolls Steering and will retain the ride control.  We are also working on power steering and Air Condition for the older vehicles.  The GM Engine will require a custom center sump cast aluminum oil-pan and Rolls Hydra-Matic out-put shaft & extension housing grafted to the new GM 4L60E 4 speed overdrive Automatic to retain the suspension ride control valve & pump if you have an Automatic equipped vehicle.

Please check back with us later as we progress on this project.
Watch the Twin-Cam 24 Valve 291 HP 4.2L 6 RUN

Technical Specs: 2006> GMC Engine

Standard Engine: 4.2L in-line 24 valve twin-cam OHC 6 cylinder

Horsepower @ RPM: 291 @ 6000

Torque @ RPM: 277 @ 4800 (foot/lbs)

Transmission: 4 Speed Automatic

Overdrive Transmission: Yes

Block & Head: Lost Foam Aluminum Casting

Cylinders:  in-line 6, (like the Rolls/Bentley)

Valves Configuration: Dual Overhead Cam with 24 Valves

Compression: 10.0 to 1

Displacement: 4161cc / (254")

Bore X Stroke: 92.96 (3.66") x 101.85 (4.01")

Fuel Type/System: Gas Engine / Sequential Electronic Fuel Injected

Est. Fuel Economy City/Hwy: 16 / 22 in a GMC SUV

Est., Combined Fuel Economy: 18 in a GMC SUV

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Last modified: February 25, 2007