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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #51  
Old 03-16-2009
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Quote:
Originally Posted by deathbypsi View Post
Why do I keep seeing a year break in the year of the heads? Whats the diff between 91-95 and the 96-99 heads?
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.
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  #52  
Old 03-19-2009
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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?
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  #53  
Old 03-25-2009
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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.
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  #54  
Old 04-05-2009
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Hello, hello? {tap,tap} This thing on?
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  #55  
Old 04-05-2009
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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
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  #56  
Old 04-05-2009
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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.
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  #57  
Old 04-08-2009
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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!
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  #58  
Old 04-08-2009
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Quote:
Originally Posted by Redrocket View Post
just incase you want it here is the site for ohv performace. just thought you might want to take a look at it.
http://www.moranav6racing.com/catego...?CategoryID=32
That link makes me orgasm... 4.0L OHV... pure sezyness...
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  #59  
Old 04-30-2009
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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.
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  #60  
Old 04-30-2009
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Are you going to dyno this motor when its done? Im curious on the numbers its going to make.
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  #61  
Old 04-30-2009
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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.
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  #62  
Old 04-30-2009
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yeah you put the bigger cam in right?
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  #63  
Old 04-30-2009
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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.
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  #64  
Old 04-30-2009
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why go to previous model heads? instead of going with say 00 heads?
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  #65  
Old 04-30-2009
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Quote:
Originally Posted by chevyslayer925 View Post
why go to previous model heads? instead of going with say 00 heads?
OHV vs. SOHC.

Can't wait for the finished product.
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  #66  
Old 04-30-2009
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Quote:
Originally Posted by sniper_101 View Post
OHV vs. SOHC.

Can't wait for the finished product.
00 is OHV. SOHC started in 01.
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  #67  
Old 04-30-2009
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Quote:
Originally Posted by fddriver02 View Post
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.
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  #68  
Old 04-30-2009
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No worries.
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  #69  
Old 04-30-2009
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From what I understand the 98-00 are the same as the 95-97 except the these have a better flowing exhaust port.
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  #70  
Old 05-01-2009
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do the rocker spacers improve anything other than oiling issues?
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  #71  
Old 05-11-2009
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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?
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  #72  
Old 05-11-2009
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thats interesting would like to know that answer too.
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  #73  
Old 05-14-2009
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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.
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  #74  
Old 05-14-2009
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Gasket set,timing chain set and head bolts all were bought off part stores on eBay.
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  #75  
Old 05-14-2009
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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.
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