Recommendation: if you're putting the $$$$ into a 2.8 rebuild, including boring the block, why not also install a 3.1 crank? Minimal increase in cost, you're already going to have to buy new pistons and have the rods installed on them.

I used Sealed Power H562CP pistons for a RWD cast-iron-headed 3.1, along with a 3100 crankshaft. Any crank out of a 90's-era 3.1 or 3.4 will work, most common is the #981 casting and it doesn't matter if the reluctor ring on the crank is slotted, since the Trooper motor doesn't use a crank sensor thru the block.

The Sealed Power pistons are teflon coated and have very tight fit in the bores, for less piston slap and great cylinder sealing.

At any rate, it'll make for quite a bit stronger motor, especially with the power mods you're doing. The 2.8 has the same bore as a 3.1 and the heads are the same so all you really need to do the upgrade are the pistons and crank. Everything else including crank bearings would be identical to what you'd be using for a 2.8 rebuild.

Just a thought.

BTW I used a K&N on my old 2.8 hot-rodded Trooper motor, which is still running strong. That filter was transferred over to the 3.4 LS with no issues whatsoever.

P.S. the clutch that came with a Rodeo/P'up 3.1 4WD is larger in diameter and would be better in a performance application. The one I used for my 3.1 'stoker' project works great.

G'luck with the rebuild..........ed