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The old 12 Valve is getting a little tune up...

1552 Views 24 Replies 11 Participants Last post by  DEMON76
I just dropped my truck off this afternoon to get a much needed tune up. It's a 98 CTD 12 valve Quad cab 5 speed with 105K miles. I needed to have the KDP done as well as a new serp. belt and a new fuel solenoid boot installed. I recently replaced the fuel filter, rubber fuel lines, lift pump and a bunch of other crap.

Now I'm having a 4K spring kit installed, the fuel plate will get a little grinding, I'm having a 4" Magnaflow exhaust installed with no cat and a straight through muffler, having the timing set as well as adjusting the valves and the injector pump timing. He'll also turn up the injector pump and see how much power I can get out of it before I start eating up the stock clutch. I'm looking for a balance between decent power and reasonable EGT numbers, I know I can take it higher but I don't want to be past 1050 - 1100 when towing if at all possible.

Can't wait to get it back and feel the difference, she's been feeling very sluggish lately. :)
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without specialty tools the timing isn't easy at all. The governor springs aren't bad but time consuming. I assume you are doing heavier valve springs too with the 4gsk. Pther stuff wouldn't be too bad just have to know where to turn what, but sometimes it's just easier to have someone else do it.

Yup like he said there, with a 4k governor spring you;ll need to upgrade the valve springs to 60lb HD springs. or you'll be tempting a valve to float and kiss a piston.
You shouldn't really need to worry about fuel pressure with that mechanical pump, they're pretty reliable and pretty strong. but if you put a guage on it with out a good snubbing device the pulses from the pump will rapidly destroy the bourdon tube in the guage, even if its a fluid dampend needle. then your guage is NFG with bad readings.
I've got a Southbend dual disk ceramic Works really good, not cheap. its actually the SBC 3600DD 6CB. I;ll have to see if it holds the next level of power coming, maybe 1 more upgrade in my future.

Now I can only assume you have the NV4500 in there. When a clutch is due for you, I would recommend upgrading the input shaft to 1 3/8" and corresponding pilot bearing. Then you can run a 13" clutch. Stocker is 1 1/4" input and 12 1/4" clutch.
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