4.000” Bore 2.0 1.5 4.0 mm ring lands Use for GM 88894219 & GM12499231  NEWER MODEL GM 602 & 604 Small Block Piston Rings Piston Ring Set - ZZ4, LT1, LT4 Engines 12499231 Chevrolet Piston Bore size: 4.000" Oversize: Standard Set of 8 ring packs of P/N 12528817 Bore (in): 4.000 in. Bore (mm): 101.600mm File Fit: No Top Ring Included: Yes Top Ring Thickness: 2.0mm Second Ring Included: Yes Second Ring Thickness: 1.5mm Oil Ring Included: Yes Oil Ring Thickness: 4.0mm Oil Ring Tension: Low Gapless: No Quantity: Sold as a set. Notes: Designed for Chevrolet ZZ4, LT1, and LT4 engines. 12499231 - GM Piston Ring Kit - Small Block Chevy- 4" Bore- Standard Bore- Fits LT1,LT4, L05- 1990-1996 Car & Truck Engines- Complete Set- For 8 Pistons Oversizes in .005, .010, .020.

Be Sure to Measure the Rings that Come Off of the Piston First with a Digital Metric-Fractional Caliper, There are a Number of Different Thickness Both Metric OR Fractional  Used on 602's Pistons.