94 4.0 upgrades

[Goldmachine]

The list of planned upgrades I have are
Comp 422 cam
Hedman headers
Dynomax exhaust
Mild port and polish on the heads and have them milled down a little.
Better coil

Would I need a tune for the cam, and are valve springs a must with that specific cam? Also what gains am I looking at with all of that?

 

[cp2295]

Comp 988 dual springs are required along with the machine work to make them fit on the heads. 5.525" pushrods are required (from smith bros, 3/16" ball ends, 5/16" tube diameter)

No you don't need a tune from what I've read, but it would benefit you.

Probably in the ballpark of 30-40hp.

I reccomend you get new rocker arms too. Depending on the wear and if they still look good get new lifters too.

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[Goldmachine]

I think new rockers would be a good thing considering the truck hs 205k on it.

Is there a link to those pushrods?

 

[downer]

pushrods.net just give them a call, they're very familiar with ranger applications

and i believe you'll need 5.550" pushrods for the 422, not 5.525"

 

[cp2295]

Oh I thought it was 5.550" for the 410 and 5.525" for the 422... Have not installed or checked length for the 422 so I have no idea from personal experience

Would make sense honestly for both to be 5.550" considering they have the same base circle..


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[Goldmachine]

So 5.550 pushrods, with a 3/16 ball end and 5/16 Diameter? Also what are some common wear items I should look for when I have the engine torn down?

 

[cp2295]

The pushrods and rocker arms. That's about it, uncommon wear items you should still check out regardless are the crank journals, rod and main bearings, cylinder bore/condition, cracks in the heads (which is actually kind of common, look between the valve seats)

Even tho they don't really wear out I would say change the timing set. Also check the cam sensor synchronizer make sure the teeth are still good and that the bearings in the feel good (i.e. No roughness)


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[Goldmachine]

I'm probably going to end up replacing all of the valve train parts. Lifters, rocker arms, and I was thinking the timing chain also. If the heads have cracks in them will they be pretty visible? I had the valve covers off to change the gaskets and didn't notice any cracks.

Also, does any one make head studs for the 4.0?