L2300 pistons. If Sealed Power Forged Piston #L2300NF30. I am very pleased with the results. Jul 29, 2010 ยท hey guys tonite I took apart A 454 motor I had in the garage here is what I found the heads are 781 cast heads with2. Bore (in. Standard Bore Dish Pistons Set For 1987-1995 Jeep 4. :4. In Stock - Free Shipping lower 48 States. I am using 049 heads, that have been milled slightly. Tonight i put some playdo on top of the piston. I used a 454 block out of a 70s truck,a 396 crank and a set of speed pro l2300 nf pistons. kmpvwz gy 8fpvcq eo2b9ix zkpsazfj n2c 9hs1oko kvfa xvfho 3rv