GM 3.0 Liter 4 Cylinder Crossflow Engine Conversion

[RDavisinVA]

For over 25 years have been building the 3.0 liter crossflow engine for the series IIA and III.
The engine is based on the 151 cuin, 2.5 liter GM Iron Duke, but like hundreds of other engines it gains performance from a longer stroke.
The longer stroke provides 183 cuin, 3.0 Liters of swept volume.

Like the other GM inline engines of the period, this unit has metal timing gears, hydraulic lifters, and the core engines were built by the 100s of thousands.
The Iron Duke was used in AMC Jeeps, Pontiac cars, Chevy cars and trucks, vans, and is still used today in the Grumman LLV mail delivery trucks in USA and Canada.
This engine came in 2 versions:
the earlier GM 4 bolt pattern shared by 4 cylinders, inline 6 cylinders, the Vortec V6, and the famous Chevy 350 V8
the later inverted V pattern shared by the 2.8 Liter V6 and other later style metric engines.

These engines bolt in and the entire conversion can be completed in a weekend.
Here are pictures of one that was installed in a Defender 90.
Note the factory alternator and power steering brackets that make for an easy install.
Performance is about 140 HP.

This engine has the Weber 2 barrel carburetor, but it can also be fitted with the smaller Holley Sniper EFI.

 

[RDavisinVA]

Short video...

 

[terryjm1]

Are any of the versions better than others? Have a top recommendation for one of them and vehicle to find it in?

 

[WoldD90]

Beautiful!

 

[RDavisinVA]

Are any of the versions better than others? Have a top recommendation for one of them and vehicle to find it in?

These engines are not in any particular vehicle at least in the 3.0 liter form.
They all come as 2.5 liter crossflow Iron Duke engines that are stroked out with a special conversion we build based on the 3.0 Mercruiser 140 HP inboard marine engine.
Some of the people who have bought them over the years nicknamed them the Iron Prince, but I haven't heard that term used in over 15 years.
The 3.0 engines are completely remanufactured and configured with custom mounts and adapters to accommodate being installed in a Land Rover.

Worth noting we just quoted our second Santana for an install.

 

[terryjm1]

“Worth noting we just quoted our second Santana for an install.”

Was kinda thinking about that...

 

[erover82]

The engine went on to gain a cross-flow head, throttle-body fuel injection, and a new name – the Tech IV – over its 16-year lifespan. Pontiac engineers even developed a Super Duty version that, though never released to the public, made for a formidable racing engine. A 3.0-liter version of the Super Duty that appeared in the 1989 Pontiac Stinger concept used 16 valves to make 170 horsepower and shouldn’t be confused with the 3.0-liter Vortec version of the Chevy II 153-cu.in. four-cylinder that GM apparently still sells as a marine and industrial engine.

https://www.hemmings.com/blog/2019/...he-same-engine-as-the-chevy-ii-four-cylinder/

It sounds like you're starting with "Tech IV" engines, and then using "Chevy II 153" parts to increase displacement. Accurate? Could a person purchase this: https://www.ebay.com/itm/Reman-3-0L...036534?hash=item26228719b6:g:eNgAAOSwaplceYpb
and your conversion, or are you shipping complete engine + conversion packages only?

 

[Red90]

That is not a cross flow engine.

 

[RDavisinVA]

We start with an early Iron Duke crossflow engine and install the early Mercruiser 140 2 piece seal crank and rods with a heavy duty low compression truck piston.
To fit a Land Rover, the side of the block has to be machined to clear a motor mount, different manifolds are used, with various custom parts to make the engine work.
I also designed our own camshaft grind and make the custom motor mounts that bolt to the Land Rover frame.
Add a custom flywheel that is drilled and machined for the Land Rover clutch and pilot bushing housing that takes the Land Rover bushing.
We only sell completely remanufactured engines that are run for about 6 hours before they get shipped.
The engine is neither cheap to build or purchase, but will transform a lethargic under-powered vehicle that is a chore to drive into a sports car like fun vehicle, so is well worth the money when you consider it bolts in and out without changing anything about the host vehicle.

 

[RDavisinVA]

I no longer have an active presence on NAS ROW.
If interested, the best way to contact me is email.
.

 

[chuckc4]

I no longer have an active presence on NAS ROW.
If interested, the best way to contact me is email.
.

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