Like other LS engines, a cam swap is common. The LSA has a very small camshaft. Upgrading to a LS9 Camshaft is worth about 30 hp. However, it won’t make any more power until 4,800 rpm. It's really only worth it if you plan on running at high rpm. Larger, Aftermarket Cams can add about 50 hp. Going as high as 0.630 in. of valve lift is also ...

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

Displacement Markings: Block Material: Timing Cover: Intake Manifold : Engine/Series: 4.8/5.3L: Cast Iron: Plain: Truck: LR4, LM7, or L59

Fastener Type: Fist Pass: Second Pass: Final Pass: Main Caps: Inner Bolts: 15 ft.-lbs.-80 degrees: Outer Studs: 51 degrees: Side Bolts

The Gen. 4, 6.2L truck engines are closely related to the LS3 used in Corvettes and Camaros. Basically stock engines can make 650 hp. under boost. With upgraded internals, they can handle over 1,000 hp. Below are some upgrades that will improve the performance of the L92, L9H, and L94 engines. Engine Block

These engines are truck versions of the high performance LS3. The stock engines all make over 400 hp. The engine blocks have the same casting number as the LS3 and L99. They share a 4.065 in. bore, Variable Valve Timing (VVT) and rectangle port heads. The blocks also have the internal oil passages for AFM.

The aluminum blocks are lightweight, compared to similar iron block engines. Just like all the Gen. 4 engines, the blocks have internal oil passages for AFM, even if it wasn't used. With upgraded internals, they can handle around 850 hp. What's the difference? The easiest way to tell the difference is to check the 8th digit of the VIN code.

Head gasket thickness is the distance between the engine block and the cylinder head, when the head is properly installed and torqued.

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