The bearing cages can fail allowing the needle bearings scatter into the engine. This has been found to be a weak point in the LS valve train when running aftermarket high-lift camshafts and stronger dual valve springs. OE rocker arms feature a trunion bearing at the pivot point. The LS7 rocker arms feature a 1.8:1 ratio while all other LS engines are at a 1.7:1. One other difference to note is the LS9 block uses 12mm head bolts while all others use an 11mm. LS3 and LS9 blocks can use LS1, LS2, LS3, LS6 and LS9 heads.LS2 blocks can use LS1, LS2, LS3, LS6, LS9 and L92 heads.LS1 and LS6 blocks will only accept LS1, LS2 and LS6 heads.The LS7 cylinder head is equipped with a single straight valve spring while the LS3, L92 and LS9 feature a tapered “beehive” shaped spring.
The LS7 cylinder head is cast with identification number 8452 while the LS3, L92, and LS. The LS3, LS9 and L92 all use the same cylinder head foundation, featuring a four-digit identification number. There are aftermarket cylinder heads and blocks available such as the LSX that feature six bolts per cylinder for high boost applications.įeatured here are LS7 cylinder heads from RHS. This provides an excellent clamping load, and evenly distributes the clamping force around each bore location. All OE LS cylinder heads feature a cylinder bolt layout that provides four bolts per cylinder. If installed on any other OE LS block it would result in valves contacting the bores. The LS7 cylinder heads feature a wider valve layout when compared to all other LS cylinder heads. All other heads feature as-cast, rough finished chambers and ports. The LS7 cylinder heads feature CNC-machined combustion chambers, intake and exhaust ports. The LS3, LS7 and L92 heads feature rectangular intake ports measured at 1.250” wide by 2.550” tall, while the intake ports on the LS7 head are 1.350” wide by 2.40” tall. These can be identified by their tall, narrow shape and radiused top profile. LS1, LS6 and LS2 heads feature cathedral shaped intake ports and measure 3.125” high by 1” wide. Take these heads and have them Custom CNC ported by a company like West Coast Cylinder Heads and now you are talking some serious power potential! Depending on the application, the L92/LS3/LS7 cylinder head can support well over 1000+ horsepower. There are a wide variety of OE, original equipment GM LS cylinder heads that flow excellent numbers and perform right from the production line.
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