How to build a 4.0 OHV for power, some limits and tips...


np205

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I like Doug's tuners, runs very nice.
 


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daniel3507

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i've never really thought about a cam till now. roughly whats the cost when its all said and done with the install? and when you replace the cam you need what?
 

'93BajaSport

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With all this talk of 300rwhp being hard to get.....has anyone actually found the torque/power limits of the stock 4.0 block and crankshaft?
 

bigredscowboy

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When you install a cam, the only two available for the 4.0 OHV are the 410 and 422 from Comp Cams, you really do a good thing for the overall performance from this engine. The 410 is what I would recommend for a 4x4 application
I was on Comp Cams website and they have two totally different CAMS listed for the 4.0L

what's up?
 

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Look at the three-digit portion in the middle of the part number: 49-410-8 and 49-422-8.

So no one has split a block or broken a crank before?
 

00RangerBlu

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Good info.
I have called CompCams(about the 422 cams) and was told that I didn't need longer pushrods or aftermarket springs.
 
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Ranger#1

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Mosinman76254

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You do not need longer pushrods for those cams Compcams offer. I have the 410 in my motor and it's quiet, no noise. Now if you needed longer pushrods I'd surely have at least a tick no?? :icon_thumby:

I did replace everything in the valve train tho but they were also stock applications.
 

'93BajaSport

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Yeah, but did you check the valvetrain geometry?
 

Mosinman76254

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The valve train geometry doesn't change with the 410 cam. That cam is designed to meet stock applications.
 

AllanD

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The OHV engine is a Torque monster that is based off the old FE engine line, like the 390, 427 and 428.
Huh?

I have an issue with your choice of the words "Based off of"

Dodge V8 and early 60's "nailhead" Buicks also used shaft style rockers
and the 4.0OHV isn't based on them either.

Yeah, it's possible you could use FE rockers on a 4.0, but...

But other than that the 4.0 other than it's design philosophy
as a low rpm torque engine has no relationship whatsoever
to the old FE/FT V8

AD
 

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Installed the 422 cams. No spring bind. On the dyno shows a 30 hp gain and 4 ftlb tq gain.
 
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8594

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hhhmmmmmmmmm.............. ive read that post before...........elsewhere word for word.............
This is most likely because he is a vendor and has posted on other sites. As opposed to recreating it he copies and pastes.

Huh?

I have an issue with your choice of the words "Based off of"

Dodge V8 and early 60's "nailhead" Buicks also used shaft style rockers
and the 4.0OHV isn't based on them either.

Yeah, it's possible you could use FE rockers on a 4.0, but...

But other than that the 4.0 other than it's design philosophy
as a low rpm torque engine has no relationship whatsoever
to the old FE/FT V8

AD
I could be wrong, but i dont think he was referring to buick or dodge motors. 390, 427, and 428 are all ford motors arent they? I know specifically the 427 is as used in the older cobrajet mustangs.

They won't share any major similarities, but the principals behind the motors also influenced the 4.0. Just like the 3.8 of my mustangs can swap out connecting rods with the 351W. And also rockers. The longer rockers of the windsor motor allow us to run a more aggressive cam, albeit with a little more rocker angle than I care for.
 


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