Nov 04, 2009 · 4) Starter is mounted on the transmission, no allowance for block mount starter as on the RWD LSx blocks. 5) Water pump is offset for for clearance reasons. LS4 is 5.3L that uses the 243 casting LS6 heads but with the softer LS1 valve springs and uses GM's D.O.D. Pace Performance offers the best pricing on products offered by GM (General Motors). Including 11610633 - Replacement GM Starter Bolt - Fits Most OEM LS Starters, LS1. Mar 26, 2013 · Three of the leading suppliers high-performance starter are Powermaster, MSD, and Proform, and their experts can provide plenty of information to engine builders, racers and enthusiasts when selecting a starter for high-compression, high-performance engines. Pace Performance offers the best pricing on products offered by PACE Performance. Including N6492 - Brand New LS OEM Replacement Starter - Chevy LS1/LS2/LS3/LS6 & 4.8,5.3,6.0L Truck Engines.The engine is a 4.8/5.3 block bored to the stock LS1 bore. The crank is a 5.3 crank rebalanced to the 5.7 rods/pistons. The flywheel was bought off of eBay and it was supposed to be from a 2010 LS3 Camaro that was getting a lot of high performance goodies so they changed the clutch while it was apart.