Modified 4.0 Piston Selection

[87Warrior]

First time poster, long time lurker here. I have been doing a lot of research trying to get a basic build sheet assembled for my 4.0L that will be rebuilt. I am having the hardest time selecting a piston. With the below listed information, where should I look for pistons?

Objective: I am looking for help in creating a build sheet/list for a modified 4.0L. This motor will be based upon a 99 XJ block and will be going into my Comanche, which will be a daily driver turning 4.10's and a 30/31" tire.
Goal: I want to pull more power out of the motor yet maintain fantastic drive-ability and reliability without the need for premium fuel.

The motor will be getting a thorough going through and rebuilt. I am thinking work along the lines of bearings and seals/gaskets, cam, pistons, porting, etc. Possibly a header as well. At this point, I am not wanting to go the extra mile for a stroker. If I can build a higher power 4.0 and drive it for another 200K miles, I will be tickled to death. The 4.0 I rebuilt in '03 (stock, 0.030 over) is nearing the 90K mile mark in my Rubi.

This is my current line of thought:
- Stock 4.0L Crank and Rods
- Comp Cam 68-321-4 Camshaft
- Stock dished piston 0.030" over
- Block decked 0.010"
- 0.043" Compressed headgasket



Build Sheet (updated as decisions are made)
Block
Crankshaft: Stock
Connecting Rods: Stock
Pistons:
Oil Pump: Mopar High Performance
Gasket Set:
Timing Set:

Head
Head Gasket: Mopar/Victor 0.043"
Camshaft: COMP Cam 68-231-4
Lifters:
Valve Springs: Mopar High Performance P5249464
- Retainers: Mopar High Performance P4452032
- Locks: Mopar High Performance P4529218
Rocker Arms:
Head Bolts:

Additional
Injectors:
Header:
Head Porting
Balancing
Valve Job

I don't anticipate the need to specify bearings and seals, as I will leave that to the builder. PLEASE feel free to critique my build direction in correlation to the parts I have selected, are missing, or are your personal selection. Thoughts, comments, or suggestions?

Thanks

[gradon]

You can get sealed power or silvolite pistons, both good brands, for ~$150 shipped: http://cgi.ebay.com/ebaymotors/Jeep-Che ... ccessories
The thing you'll want to pay attention to is pin height and dish cc. Stock have 1.601" and the smallest dish, the sealed powers 1.592" and little more dish, and others 1.585" with smaller dishes, so pistons might be .016" further down the cylinder ATDC, and that .010" off the deck cut just to keep the same quench. Consider +.040" or +.060" pistons--they cost the same and you might get .1l. You might need to play with the map adjuster if the comp let's the engine breathe better.

[87Warrior]

gradon - Thanks for the information and ideas. It seems that with the Sealed Power's the additional dish (15.8cc total) and shorter pin height (0.009" less) it would be most wise to go with 0.00" deck clearance. The results yield a Static CR of 9.1:1, Dynamic CR of 7.9:1 and Quench of 0.043".

Back in '03 when I rebuilt my Rubi's 4.0, I ordered oversize pistons from Chrysler. I have been searching online and can not seem to find anything more than standard bore replacements. I plan on stopping by the local dealership to see what they can get. If Chrysler does still sell over sized pistons I assume they would have the stock 13.1cc dish volume and 1.601" pin height. In that case 0.00" deck clearance would probably be too much for 87octane.