What's the most HP for a 4.0?
- Thread starter diz rocks
- Start date
OCMI_Teddy
NAXJA Forum User
- Location
- San Diego
so who now has that piece?
derrickdrew17
NAXJA Forum User
- Location
- Duncanville
j99xj said:
I was searching long time ago and some one said on here or on Jeepforum that some one made a cross flow or more improved verson of the 4.0 head Is this true?? Because it seems this is whats limiting the performance of the 4.0. If it could breath better you might get better performance out of it.
Last edited:
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
Hesco make an aluminium head for the 4.0 but it's not a crossflow version. It does outflow the stock head though so there IS a performance gain. Valves are standard size but the pushrod holes are bigger so you can remove the lifters without removing the head, and you can fit roller rockers to this head with enough clearance under the stock valve covers.
The 2 grand price for an assembled head is enough to make your eyes water.
The 2 grand price for an assembled head is enough to make your eyes water.
derrickdrew17
NAXJA Forum User
- Location
- Duncanville
Yep you are right. Those are mity high heads.
OCMI_Teddy
NAXJA Forum User
- Location
- San Diego
Dr. Dyno said:
It's like hesco took a giant vice to your wallet:bawl:
A modern cross-flow, 4-valve cylinder head would be like starting with a fresh sheet of paper. But I just don't see justifying the costs for it, when you can do this with a stock style head:
5.0L Very high-buck stroker:
4.06" offset-ground stroker crank
Jeep 4.2L 5.875" rods
Small Block Chevy UEM-KB142 hypereutectic pistons
11.1:1 CR
Crane #751111 238/248 degree solid lifter cam
Ported big valve 2.02"/1.60" cylinder head
OEM 0.051" head gasket
0.038" quench height
Flometrics F&B 68mm billet TB
3.0" exhaust system
Ford 30lb/hr injectors with adjustable FPR or MAP adjuster
Custom PCM programming
328hp @ 5250rpm, 375lbft @ 3800rpm
Still naturally aspirated!
5.0L Very high-buck stroker:
4.06" offset-ground stroker crank
Jeep 4.2L 5.875" rods
Small Block Chevy UEM-KB142 hypereutectic pistons
11.1:1 CR
Crane #751111 238/248 degree solid lifter cam
Ported big valve 2.02"/1.60" cylinder head
OEM 0.051" head gasket
0.038" quench height
Flometrics F&B 68mm billet TB
3.0" exhaust system
Ford 30lb/hr injectors with adjustable FPR or MAP adjuster
Custom PCM programming
328hp @ 5250rpm, 375lbft @ 3800rpm
Still naturally aspirated!
98XJSport
Destiny is the rising sun
- Location
- Western Maine
NXJ said:
Is this your build? Otherwise, Im not sure if anyone has done a 5.0 stroker. Correct me if Im wrong, because it's something I would like to hear more about if it's been done.
98XJSport
Destiny is the rising sun
- Location
- Western Maine
From reading conversations that the good Dr. has had about that configuration, it's mathmatically possible, would require a custom crank I think it was, and would involve a possible but unsafe overbore...
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
Jakes Racing Engines used to supply a 5.0L stroker with 4.00" pistons and a 4.06" offset-ground stroker crank but they went out of business 2 years ago (just a month after Accurate Power went belly up) so you can't buy one now. You can still build one if you've got very deep pockets and balls like coconuts. 
While I'm still on the subject of nether regions, Hesco does have the customer by the short n' curlies when it comes to the pricing of their aluminium head because they have exclusive marketing rights to it.
While I'm still on the subject of nether regions, Hesco does have the customer by the short n' curlies when it comes to the pricing of their aluminium head because they have exclusive marketing rights to it.
OCMI_Teddy
NAXJA Forum User
- Location
- San Diego
Wouldn't Hesco built a 5.0L stroker if ya have REALLY deep pockets?
MudDawg
NAXJA Member #728
- Location
- Central Florida
OCMI_Teddy said:
Most likely...and in my opinion, the Hesco head is not overpriced considering the production volume....if you want pricey....check on a basic CNC fitted to run aftermarket head for a Suzuki 1150 dragbike engine....and if that does not widen your eyes....call Vance & Hines and price one of theirs, fully prepped.... I'm not about to rush out and buy a Hesco head because I don't need one that good....but it is a worthy investment if you are looking for max output.
Hello Gents,
This is an interesting and often asked question. I guess it's the nature of bein' motorheads:spin1: I am curious if any of you know anyone who has tried or substantiated the claims of Clifford Engineering as to the Redline/Weber FI upgrade on their rebuilt 4.0, with their cam,header, and intake. They claim in their catalog that it makes 400-450 pounds of torque. IF that's true, what would the approximate HP be? That'd be a MIGHTY MEATY powerplant if it ACTUALLY makes that kind of power. They've been in the I6 game for longer than any company I know of, so maybe it's for real. I just would like to hear it from an actual owner.
crusT
This is an interesting and often asked question. I guess it's the nature of bein' motorheads:spin1: I am curious if any of you know anyone who has tried or substantiated the claims of Clifford Engineering as to the Redline/Weber FI upgrade on their rebuilt 4.0, with their cam,header, and intake. They claim in their catalog that it makes 400-450 pounds of torque. IF that's true, what would the approximate HP be? That'd be a MIGHTY MEATY powerplant if it ACTUALLY makes that kind of power. They've been in the I6 game for longer than any company I know of, so maybe it's for real. I just would like to hear it from an actual owner.
crusT
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
OCMI_Teddy said:
You need to have deep pockets to buy just about anything from Hesco so yes, I'm sure they could build you a 5.0L stroker if you remortgage the house.
$2000 for Hesco's aluminium head definitely isn't cheap but they'd probably have to sell at least 50 at that price just to recoup the tooling costs. Since they're a low volume supplier and catering to a small market, they can't afford to lose a lot of money on this project. The same also applies to an even greater extent with the aluminium block that they're planning.
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
crusTodd said:
I've got only one answer to that claim; it's BS!
Flash
NAXJA Forum User
- Location
- Evanston Wy
crusTodd said:
Personally i thing it is vary much possible, but the Squeeze and forced induction would have to be in the mix.
That kind a power will not come ease.... or cheap. A Roller Cam would "help", to get that number but................some day, we will have a Roller Cam, to Dyno .:eyes:
Flash.
MudDawg
NAXJA Member #728
- Location
- Central Florida
Dr. Dyno said:
Dino and my self don't ALWAYS see eye to eye....but I call BS also....I built my original 2.5 using one of their "kits"....and if you listened to their claims, the mighty 2.5 should make maybe 200 hp...nope....MAYBE close to 300 NA on a completely non streetable 4.0....The Indy motor built by Navarro, turbo charged on alcohol was reputed to make only about 500-550 HP....
You want that kind of output from a 4.0 ....you will need TWO sets of Nitrous nozzles and/or a big ole supercharger...
Dr. Dyno
NAXJA Forum User
- Location
- Al Ain, UAE
MudDawg said:
But we're both crotchety old pharts with poor eyesight anyway. Sometimes I can't see beyond the end of my nose.
