Engine Block Specifications. Block P/N: 12621983, 12623969. Material: 319-T7 aluminum. Block Casting Number: 12621766 ...

LS9. The LS9 was introduced in 2009 for the ZR1 Corvette. At the time, it was the most powerful engine ever produced by GM. It featured a 2.3L roots blower and made 638 hp. The heads, block, and internals were all upgraded for strength. It also used a dry sump oiling system. The LS9 was available until 2013. It was replaced in 2014 by the LT4. LSA

The information below applies to vehicles with the original engine still installed. If you have a second-hand vehicle that doesn't match the info below, the engine may have been swapped out. Follow this link for help Identifying an LS Engine by Inspection. Click on the RPO code in the table to see more details about that engine.

The intake manifold will tell you whether the engine came from a truck or a car. The car manifold has a rounded top and you can see the contour of the intake runners. The truck manifold is about 3 in. taller and has more of a box shape. If you see a supercharger you can skip the chart. You have either an LSA or LS9; Identification Chart

(The LS9 came with forged pistons from the factory.) Due to extremely high cylinder pressure, the heads can start to lift around 1,000 hp. At that point, you will need to basically build a whole new engine. The following upgrades will be required. A stronger, aftermarket engine block with 6 head bolts per cylinder

Engine Block Specifications. Casting Numbers: 12571048, 12601900, 12569513, 12568573. Material: Aluminum. Displacement: 5.3L / 325 c.i.d.

The block is secured to the engine stand. It may rotate with the added weight of the cylinder head. Installation Process. Press new Dowel Pins into the engine block. There are 2 dowels per side (in holes #7 and #8). They align the head to the block. Always replace them before installing your cylinder heads. If needed, lightly tap them in with a ...

Engine Block Specifications. Block Part Number: 12584724. Material: Aluminum. Casting Number: 12621766. Displacement: 6.2L / 376 c.i.d.

When engine load increases: The computer sends a signal to the LOMA. The LOMA solenoids close. Oil bleeds off the lifters. The lifters return to normal operation. **All 8 cylinders are now powering the engine.** How does it affect performance? AFM is good for gas mileage. AFM engines are 5-7% more fuel efficient.

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