Our TSP 454 cid LSx short-blocks offer the best durability for the best price possible!  The GMPP LSX block comes from the factory with a 3.860" bore, and can be bored to a max of 4.250!"  Our standard short-blocks come fully-assembled using a Callies Compstar 4.125" stroke crankshaft, Callies Compstar 6.125" connecting rods, and Wiseco 4.185" flat-top pistons with -2.8cc valve reliefs.  We offer many upgrades for our short-blocks, and we will custom-build one for your application!  We try to keep a few 454 cid LSx short-blocks in stock, and if you order one of our in-stock short-blocks it can ship as soon as the next business day!   Feel free to give us a call, and we will help you select the parts that will best suit your application.  You can also call us to check if any of our engines in stock will work for what you are looking to do!  All short-blocks will be built using the 2005 and older 24x tooth reluctor wheel on the crankshaft.  If you have a 2006+ vehicle that you will be installing our engine in you may need the updated 58x tooth reluctor wheel!  BE SURE TO SPECIFY IF YOU NEED THE NEW RELUCTOR WHEEL WHEN ORDERING!  (NOT WHAT YEAR MODEL)

You can also upgrade to include the LS2 conversion kit that will include the LS2 timing cover with camshaft position sensor, LS2 valley cover, LS2 timing set, and the necessary cam sensor and knock sensor harness extensions!  This kit will be necessary to install any LSX-based engine into an LS1 vehicle.

Wiseco pistons will use a 1.2mm/1.2mm/3.0mm ring pack with a steel top ring and Napier second ring. This will be the standard ring pack used with any of our Wiseco exclusive piston sets, and this ring pack will be offered with any Wiseco off-the-shelf piston set as they make the change from their previous 1/16"/1/16"/3.0mm ring pack. All Wiseco piston sets will use the Wiseco/NPR-specific ring sets, and all Diamond Racing piston sets will use an exclusive Total Seal ring set. The Diamond Racing piston sets will come standard with an exclusive TSP/Total Seal plasma moly/napier 2nd ring set, and a steel top/Napier 2nd ring set is available for an additional cost. We do build many engines to keep in stock, and we do our best to offer a variety to suit everyone’s wants/needs. With that said, not all engines will be in stock. The average build time will normally take three to four weeks once all parts are at the machine shop. This is only an estimate since circumstances and wait times will vary. Please give us a call for an accurate, up-to-date time quote.

For any nitrous setup exceeding a 150HP shot or any boosted application exceeding 10 psi, we recommend a steel top ring set. The steel top ring will handle the added heat of the nitrous and boosted applications much better than a plasma moly top ring set. Unless otherwise specified, our engines will use a Napier second ring for maximum oil control. This is just another step that we take with all TSP short-blocks to ensure you get the best quality possible!  Due to the long stroke and smaller head gasket area of the 454 cid LSX engine, we do not recommend using more than a 150 HP shot of nitrous on this engine.  We do offer custom boost and nitrous engines using the GMPP LSX block in various sizes.  Please contact us for information and pricing.

All TSP engines will include 12 quarts of Joe Gibbs break-in oil for no additional cost. Proper break-in oil and procedures for your engine are just as important as the build process! The Joe Gibbs break-in oil allows for proper ring sealing against the cylinder walls upon start-up, as well as for the break-in period once the engine is up and running. Most off-the-shelf engine oils do not have the necessary ZDDP additives to allow for proper break-in of a new engine, and we want to take every precaution possible to ensure that your new TSP engine receives a proper break-in!