There should actually be three breaks, 90-94 / 95-97 / 98 and up.

The 90-94 heads have the largest combustion chamber. and a D shaped exhaust port.

The 95-97 heads are virtually identical except for a much smaller combustion chamber. IMHO the best with the least amount of work.

98 and up heads have the same smaller combustion chamber as well as a smaller round exhaust port. A change designed to promote exhaust velocity & heat up the catalytic converters more quickly. If you're into porting you can apparently get these to flow better than the 95-97's.

 

Not sure what Im doing for heads just yet. If mine arent cracked or warped I will use them again.If they need too much work I will just get a set of newer castings.

I got my 422 cam today and was wondering what springs are a direct swap for these heads? I see people using the Comp 988's but also seen something about getting different retainers also? Info?

 

COme on guys! Dont bail on me now!

I need to know about the springs and if I need to order different pushrods to work with the cam.

 

Hello, hello? {tap,tap} This thing on?

 

Crane used to make a set of retainers that would work, but you had to machine the valve seal boss down for clearance.

Smith brothers can make you the push rods you'll need. 5.55" long if nothing has been milled, if it has just subtract the amount from the 5.55"

You can use the stock retainers & locks, they fit a little loose but work just fine & don't need any machining. I've gone over 20 000 kms using the 988 springs with the stock valve train without issue. & my 4.0L hits the 6500 rpm limiter on almost every burnout & has over 1000 passes down the 1/4 mile!!

Trev

 

Ah,very good! Thanx.

Sux I gotta put this on the back burner for a bit,I just bought a new house and will close on the 25th so everything gets packed up for the time being.

 

idk know much about pulling with v6's, maybe a power chip would help, probably not for low end torque, but if you are pulling that much weight you need a larger vehicle, by the way, a diesel f250 and even f350 get the same mileage as 4x4 4.0l rangers. they also have way more power, but thats is what i would do IMO! no one please quote me on this!

 

That link makes me orgasm... 4.0L OHV... pure sezyness...

 

Motor should be out tomorrow....lot of set backs on this project lately!

Talked to Smith Bros today and they said they have been getting calls for up to 5 different lengths for 4.0 pushrods this past year. They think that Comp is not using the same base circle for the cams anymore which would require different pushrods depending on what cam blank Comp starts with. So I am waiting till next week when Im ready to essemble the motor and will use my checker to get a true length.

 

Are you going to dyno this motor when its done? Im curious on the numbers its going to make.

 

Prolly not. Never did before hand so I wouldnt have anything to judge against. Im guessing once its done it might be in the 200 crank HP range. If the head work and cam swap is worth 30-35 hp I would be surprised.

 

yeah you put the bigger cam in right?

 

Comp #422 Comp #988 springs and Smith Bros pushrods as soon as I take a measurement.

Heads should be getting ported this weekend as long as the check out ok for cracks.If they are bad I will go with some new 95-97 heads instead.

 

why go to previous model heads? instead of going with say 00 heads?

 

OHV vs. SOHC.

Can't wait for the finished product.

 

00 is OHV. SOHC started in 01.

 

I knew that, had no idea the heads were interchangeable between the two motors . . . I guess that's why I say out of the 4.0 section.

 

No worries.

 

From what I understand the 98-00 are the same as the 95-97 except the these have a better flowing exhaust port.

 

do the rocker spacers improve anything other than oiling issues?

 

Whats the deal with my intake gaskets?

My factory ones I removed had the rear coolant crossovers blocked off with the rubber gasket where my new gaskets have open crossovers at all 4 corners?

 

thats interesting would like to know that answer too.

 

where'd you get the gasket FORD or auto parts store, i know certain models have two different style headgaskets, like the 3.8 you get the headgasket from an auto parts store its going to be different they the one from ford. its a design change to fix an issue i think...not sure.

 

Gasket set,timing chain set and head bolts all were bought off part stores on eBay.

 

Well my heads are cracked so looks like Im lookin for another set now.

Also, what are the sets for pullin this cam? Set motor at TDC then what? Cam position sensor need to be removed? Never did a cam swap on one of these motors.