I wish I would have known this Edlebrock is down the street from me. :/

They wanted a 2006 with 50k or less http://www.edelbrock.com/automotive/misc/test-vehicles/

Oh Damn never mind lol, I believe they don't even let you keep the parts for free they just give you a huge discount on the parts. Unless they're different.

Would be one of the last tj made everything else the 4.0 was gone from.

At least they saw the need for one and made it happen when no one else has. At least with that head you can do a lot more than a cast iron one as far as rework and flow numbers.

My machine work porting and polishing always cost more than my Dart, AFR, Brodix heads did. Same with my Dart blocks and intakes machine work is where the extra HP is at.

Also it's aluminum so cooling would be better and I'm sure they fixed the cracking head issue. I wonder if the combustion chamber is the same way as stock or smaller :)

I agree. but starting with an inherently poor head design...how's that saying go, " you can polish a turd, but it's still..."??bear in mind the cooling problems everyone has with these engines. now put an AL head in the mix.

I was reading more about this and I do believe I read that the combustion chamber is of a ᤾"modern design" most people's overheating issues are due to lack of maintenance. I doubt those people would be trying to get a "performance head" I also forgot another slight benefit the weight savings! Lol a stock head weighs a lot.

I think it goes something along the lines of

"You cant polish a turd, if you try you just get $hit all over your hands"

This is the first one to be installed in a vehicle!

http://theamcforum.com/forum/uploads...k_Head_005.jpg

http://theamcforum.com/forum/uploads...k_Head_006.jpg

http://theamcforum.com/forum/uploads...k_Head_008.jpg

Dennis

Go on.... :popcorn:

First one installed in a vehicle and they didn't upgrade to the "horseshoe" type intake manifold? What's the point in improving flow in the head if you're going to still limit it at the intake???

Ooo shiny! :popcorn:

WOW, LOL!

First off, this installation is for creating the installation instructions and for drivability comparison testing, not performance testing! The install was done on my 91 XJ so for that simple reason we installed the head with the stock intake as it was before. Performance testing is being done on our engine dyno. During the dyno testing (among other things) we did compare the early and the late ("upgrade") intakes against each other, and surprisingly the earlier intake (like in the pictires) actually worked a little better (on the stock head and on our head on a stock engine) than the later 4.0L curved intake. Who knows, maybe we'll have to make an intake to go with our Cyl. head!!!!

I only have about 150 miles on the head so far and it seems to work well on my basicly stock engine. My Jeep seems to pull a little harder going up the on ramp I use in the morning, and it feels to have a bit more power when passing.

We are still looking for an 2006 Wrangler for emissions testing if anyone is interested!

Dennis

I'm glad you guys are putting out products for our XJ's. If you were to do an improved intake that would awesome. Isn't that what you're know for? :D