Early LS engines produced from 1997 through approximately 2000 have a longer crankshaft snout than later LS engines. This difference affects flexplate and harmonic balancer fitment, and it must be accounted for when pairing an early LS with any automatic transmission.
WHAT IS THE LONG-SNOUT ISSUE? The crankshaft "snout" is the front end of the crank that protrudes from the front of the block. The early LS snout is longer by approximately 0.400". If you use a flexplate designed for a later (short-snout) LS crank, it will not position correctly relative to the torque converter, which can cause the flex plate to contact the bellhousing or the converter not to engage the pump drive properly.
WHICH ENGINES HAVE THE LONG SNOUT? Generally: 1997–2000 LS1 engines (Corvette, Camaro, Firebird) Some sources define the cut-off as 2000, with 2001 being the transition to the short snout. Confirm by measuring your actual crank snout or checking the casting date.
WHAT YOU NEED: • A flexplate specifically designed for the long-snout LS crankshaft • Standard short-snout LS flexplates will not work correctly • Aftermarket suppliers offer long-snout specific flexplates — be sure the part listing specifies 1997–2000 or "long snout" compatibility
COMPATIBLE TRANSMISSIONS: • 4L60E and 4L80E bolt directly to the LS bellhousing pattern — no adapter plate needed • If using a TH350, TH400, 700R4, or other older transmission, you still need an adapter plate (see article SR-04907) AND the correct long-snout flexplate
CONFIRM BEFORE YOU ORDER: If you're not sure which crank you have, measure the snout or contact us with the casting number and VIN. Call 1-844-XPARTS-1 or email support@expediaparts.com.
