So I was looking around on Fordsix.com and they were talking about crossflow heads for the 300I6, They basically said you can get two 351 cleveland heads and cut a cylinder off of each, furnace braze them together and with some pushrod mods (little more to it then that) you have crossflow heads.

Did AMC make a v8 that has similar bolt pattern to the 4.0l?
Maybe even a v6?

Does anyone have access to these heads to see if the bolt pattern and cylinder placement is the same?????

CAN WE DO THIS!!!! Just imagine a 4.0l with a crossflow head. HELLS YEAH!!!!

Sounds like an awesome idea. BUT, it sounds like more work than an LS1 swap... It also sounds like a coolant leaking nightmare... It really would be cool though. It would be nice if Edelbrock made a performer RPM head and intake.

the six cylinder inline engine is a really great platform. On fordsix.com there was a link to the car with the frankenhead. It was a drag racer. I would like to try something new with the inline six. When I eventually swap the 4.0l out for a bigger engine I'd like to put it into a rat rod. That would be original. If we could find a way to make our own frankenhead for the jeep I think it would help alot of guys out. It all depends on if you can find a AMC head with same bolt pattern that all the passages line up pretty close.

AMC never made a V6 of their own, and I think all of their sixes were side-draught.

A cross-draught head was an idea on our "clean sheet of paper" build on the old Strokers mailing list (ca. FEB2002,) but we decided it would be impractical from manifolding (you'd have to put the intake overtop of the distributor, and where would the plugs go? You'd probably end up having to fab up a brand-new intake to make it work around everything else.)

Not saying it's a bad idea - and I'd still like to see it (probably the only reason I'd sit still for an OHC version of the 242...) but it's going to be an awful lot of work.

Frankly, I think taking the CSRV (Coates Spherical Rotary Valve) concept and modding it to work with the AMC six, and then making that a cross-draught might be easier to handle...

What about a V8? Were there any V8 heads that have the same cylinder placing as the 4.0l????

I cannot comment on V8's, but if I recall correctly, the 4.0 shares cylinder spacing with the 4.2 and Typhoon 232 engines.

Look no further than the Ford 351 Cleveland heads. They have the exact same bore spacing (4.38") as the 4.0 6 cylinder and the 2.5 4 cylinder which is it's little brother. I am working on a 2.5 and adapting the Cleveland head to it. After this is proven to work I will be cutting and welding two two heads together to go on the 4.0 6 cylinder.

“Your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.”
-Jeff Goldblum

Pretty cool stuff

My ford 300 is getting close

These are some of the coolest engines. Ive been grinding in these valve bowls actually like 20 hours worth of grinding lots of gains to be had.

Id imajine some investment in time and tools the gains might be similar in the 4.0 jeep head

Ive watched the vid and it looks like ton of epoxy work in that head.

I feel we arent as smart as these old boys look at what they were doing with literly sticks and stones compared what we have available. With those tools comes built in lazyness

Please keep me in the loop on this.
I am buying an XJ this month.
Keep up the great work.
Cheers,

The only way to mske this a reality is to do it yourself

I can see that this post is very old and I have looked into this as well. However, though there would be some challenges, its not impossible. Just as how Edelbrock cad designed and manufactured their 4.0 aluminum head. This same approach can be addresses but with a cross flow configuration. Design and model the castings, submit the file and drawing package to the foundry/casting facility and so on.... Obviously there are more details to address but doable. I know it would be a seller if a company (or individual) would step up to the plate and put the effort in. It could be a cash cow. I would buy one. Just a thought.

Jeep had a crossflow cylinder head on an inline six in the sixties. It was overhead cam also.

https://en.wikipedia.org/wiki/Jeep_Tornado_engine

The OE Jeep cylinder heads can already max out the air flow potential of the engine's bore size. Another chamber/port design will not be able to significantly improve power, unless it is 4 valve per cylinder (Duramax/Cummins 6.7 style).

Crossflow will only decrease intake air temps. You can decrease intake air temps for way less $ than a Frankenstein head. Methanol.