Paul Bruchal Posted December 23, 2014 Posted December 23, 2014 What the title says Edelbrock is making performance heads for our 4.0's! http://bangshift.com/general-news/new-products/jeepers-rejoice-new-edlebrock-performer-jeep-cylinder-head-just-looking-info-photos/
shelbyluvv Posted December 23, 2014 Posted December 23, 2014 Last I heard they were pricing it at about $1900 and it is currently under a redesign and won't be available for some time. Rumor has it they are raising the valve cover sealing surface to clear roller rockers with stock valve covers and doing some floor cleaning.
HOrnbrod Posted December 23, 2014 Posted December 23, 2014 Meh, basically a cast iron head with bigger valves. At $1900 I'd spend $100 more and go with the Hesco alloy head. It's already outgrown it's growing pains and has proven reliability, unlike the new Edelbrock head. But it's good to see new go-fast products being developed for the 4.0 I6.
xjrev10 Posted December 23, 2014 Posted December 23, 2014 I just got a message on Facebook that pricing will START at $1400. That was from the Edelbrock Rep.
MiNi Beast Posted December 23, 2014 Posted December 23, 2014 I'm liking the hesco setup vs this one as well, but time will tell.
Alexia Posted December 23, 2014 Posted December 23, 2014 Meh, basically a cast iron head with bigger valves. At $1900 I'd spend $100 more and go with the Hesco alloy head. It's already outgrown it's growing pains and has proven reliability, unlike the new Edelbrock head. But it's good to see new go-fast products being developed for the 4.0 I6. The Hesco aluminum head has been out of stock for the past three years. I doubt it matters how much more it costs. :P
johnj92131 Posted December 23, 2014 Posted December 23, 2014 Hesco head tooling needs to be replaced according to Hesco. Because of the cost, not going to happen, per Bernie 3 months ago. There is a current, long thread on the Edelbrock head at: http://www.jeepstrokers.com/forum/viewtopic.php?f=5&t=4638 On page 6 and 7 there are some interesting posts about combustion chamber shape, quench, and squish.
Jeepman Posted December 23, 2014 Posted December 23, 2014 Meh, basically a cast iron head with bigger valves. At $1900 I'd spend $100 more and go with the Hesco alloy head. It's already outgrown it's growing pains and has proven reliability, unlike the new Edelbrock head. But it's good to see new go-fast products being developed for the 4.0 I6. The Edelbrock Head will be Aluminum from what I have seen...
HOrnbrod Posted December 23, 2014 Posted December 23, 2014 The Edelbrock Head will be Aluminum from what I have seen... Should be. I didn't read the Edelbrock description page very thoroughly, but don't remember seeing anything about aluminum.
Jeepman Posted December 23, 2014 Posted December 23, 2014 The Edelbrock Head will be Aluminum from what I have seen... Should be. I didn't read the Edelbrock description page very thoroughly, but don't remember seeing anything about aluminum. Ah if you click the link it shows the Head at a Trade show so I would be thinking that they are displaying an Aluminum head that that's what the production would be...
ftpiercecracker1 Posted December 23, 2014 Posted December 23, 2014 As cool as it is how much of a power increase can we really expect to see?
Rockfrog Posted December 23, 2014 Posted December 23, 2014 A crossflow head would be a better choice performance wise, especially given the cost ... I can't see a huge gain from a stock layout.
benjy_26 Posted December 23, 2014 Posted December 23, 2014 Unless you're going forced induction, I don't see this making a whole lot more power than a properly worked over stock head.
reece146 Posted December 24, 2014 Posted December 24, 2014 The power gains with this head come from designing a stroker around it and getting the quench and compression ratio correct (Al allows you to bump CR above what an Fe head will tolerate). Just bolting it on to a stock 4.0 bottom end will give some gains but likely will be disappointing per cash outlay. I've seen projected prices from $1200 - $1400 in various places. When I build a stroker for the XJ I'll likely go this route "just because". Hoping for ~270 hp / 375 lb-ft on 87 octane via a modified "poor man's" build. Should be doable using other stroker builds as examples to extrapolate from.
jpnjim Posted December 25, 2014 Posted December 25, 2014 There's a 10 page thread over at the AMC forum on it; http://theamcforum.com/forum/aluminum-head-for-40l_topic47259.html the thread starter works for Edelbrock ...and if you go to the last page there's some BLING pictures of it installed on his 1991 Cherokee :)
benjy_26 Posted December 25, 2014 Posted December 25, 2014 The power gains with this head come from designing a stroker around it and getting the quench and compression ratio correct (Al allows you to bump CR above what an Fe head will tolerate). Just bolting it on to a stock 4.0 bottom end will give some gains but likely will be disappointing per cash outlay. I've seen projected prices from $1200 - $1400 in various places. When I build a stroker for the XJ I'll likely go this route "just because". Hoping for ~270 hp / 375 lb-ft on 87 octane via a modified "poor man's" build. Should be doable using other stroker builds as examples to extrapolate from. I got a buddy who has about that output with 505 Performance goodies in his 4.7L stroker. I have about 220-230 out of my poor man's stroker build. I'm hoping for 250-255 with a new cam and some head work.
reece146 Posted December 25, 2014 Posted December 25, 2014 Yep, numbers are totally doable. Run higher CR and 91 and more is available.
HOrnbrod Posted December 25, 2014 Posted December 25, 2014 Totally. Check this out: http://www.jeepstrokers.com/forum/viewtopic.php?f=5&t=387 But the Unichip is gone now (it had intermittent CPS signal failure internally). I have the non-adjustable Sharp roller rockers in hand. Before installing, I think now maybe I'll wait a bit and see how the new Edelbrock head pans out.
benjy_26 Posted December 25, 2014 Posted December 25, 2014 I wonder how exactly Edelbrok improved the combustion chamber. From what I've read, the 4.0HO head flows pretty well as long as you keep the velocity up. If you hog out the ports and go with huge valves, you don't gain a whole lot, hence my comment about forced induction.
johnj92131 Posted December 25, 2014 Posted December 25, 2014 I wonder how exactly Edelbrok improved the combustion chamber. From what I've read, the 4.0HO head flows pretty well as long as you keep the velocity up. If you hog out the ports and go with huge valves, you don't gain a whole lot, hence my comment about forced induction. You may want to read this article by David Vizard: http://www.hotrod.com/events/coverage/0311em-power-squeeze/ Good information about minimizing detonation, quench,combustion chamber shape, flame propagation. All areas that can be improved upon considerably by a more modern combustion chamber shape. Is it going to be a better head than the Hesco aluminum head? Could be, time will tell. Certainly will be a better price and likely has more engineering time in the combustion chamber design. The Jeep 4.0 head (combustion chamber) does not react well higher compression ratios without going to premium fuel quickly. Hence the stock 8.8:1 compression for 87 octane fuel. Boost the compression to 9.3 and you need mid-grade or more. So, does anyone want to buy my Hesco head??
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