Engine builders please help.

[aaron88]

I am in the process of building a 1993 ford ranger 4x4 into a pre runner/class 2000 truck for some local races. Now onto my questions I am pulling the 4.0 out for a rebuild plus a little extra to wake it up not lookin for huge power just a little extra and I figured I might as well wile it's out and being rebuilt. Will be bored .20 or .30 over depending on what the machine shop says all new bearings ext now for my questions I will be running a comp 410 cam and I would like to run the 1.73 adjustable rockers also will I be okay with stock length push rods and valve springs or will I need to change those and if so what length and spring rate will I need to purchase.

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[aaron88]

I should also add that I plan on running 1995 heads to gain a bit of compression plus one of mine was cracked so they needed to be replaced any ways but I wanted the 1995 heads to gain a bit of compression I know with out the egr system I'll have to run 91 fuel but I'm not to worried about that I usually run 91 in it anyways and I always run 91 in my f150 so I am use to it.
Also debating on this because the other set of rockers says they might need addition clearance to the head and these say they are a factory replacement just not adjustable not sure what to choose.

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[jeremysdad]

4.0 uses shaft mounted rockers, not pedestal. Also pretty sure 4.0 is close to max on bore size stock. Could run into longevity issues if you go bigger than a .010 clean up.

 

[monstermazda]

If it need to be bore to 10 go with it. Something can happen and you still have bigger bores you can go to

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[aaron88]

I'll bore it as much as the machine shop says is safe not worried about having to do it again 4.0s are cheap and plentiful around here. and I called Harland sharp they said the rockets would not work but could set me up for right around 750-800$ ready to roll.


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