Enginetech S93156-STD is a premium standard bore piston ring set for 2002-2009 Chevy, GMC, Buick, Oldsmobile 4.2L 256ci I6 engines, sold as a complete set covering all cylinders.
Important Notes:
- Sized for standard (unmachined) cylinder bores. Verify your finished bore diameter with a precision gauge before ordering.
- File-fit and gap each ring to the manufacturer's end-gap specification for your application before installation. Improper end gap causes blow-by or ring-end butting under heat.
- Replace piston rings as a complete set during any rebuild. One set covers all cylinders for the engine.
- Premium. Steel top. 1.2 x 1.5 x 2.5mm. Does not fit early OE pistons with 1.2mm second ring.
| Part Number | S93156-STD |
| Grade | Premium |
| Bore Size | Standard |
| Ring Stack (Top/2nd/Oil) | 1.20 / 1.50 / 2.50 |
| Standard Bore Diameter | 3.661 in |
| Quantity | Complete set - covers all 6 cylinders |
| Engine | 4.2L 256ci I6 |
| Year Range | 2002-2009 |
| Makes | Buick, Chevrolet, GMC, Isuzu, Oldsmobile, Saab |
| Country of Origin | JP |
Sold as a complete piston ring set - one set covers all cylinders and is required per engine.
Fitment:
- 2002-2004 Oldsmobile Bravada 4.2L 256ci I6
- 2002-2006 Chevrolet Trailblazer EXT 4.2L 256ci I6
- 2002-2006 GMC Envoy XL 4.2L 256ci I6
- 2002-2009 Chevrolet Trailblazer 4.2L 256ci I6
- 2002-2009 GMC Envoy 4.2L 256ci I6
- 2003-2008 Isuzu Ascender 4.2L 256ci I6
- 2004-2005 GMC Envoy XUV 4.2L 256ci I6
- 2004-2007 Buick Rainier 4.2L 256ci I6
- 2005-2009 Saab 9-7x 4.2L 256ci I6
Enginetech piston ring sets are manufactured to OEM specifications and offered in both premium and cast grades to match the demands of stock rebuilds and moderate-performance builds. Each set is application-specific, with ring widths and end-gap characteristics matched to the bore and groove geometry of the engine family it serves. Ring sets are sold by bore size - standard for unmachined bores, with oversizes for blocks that have been bored and honed - so verify your finished bore diameter with a precision gauge before ordering, since rings sized for the wrong bore will not seal correctly. Always file-fit and gap each ring to the manufacturer's specification for your application, and replace rings as a complete set during any rebuild. Enginetech documents every set with the ring stack dimensions, bore size, and cross-references so the correct set reaches the bench the first time.
WARNING: This product can expose you to chemicals including lead and nickel, which are known to the State of California to cause cancer, birth defects, or other reproductive harm.
