Product Description
Interstate-McBee M-4955366 Piston Ring Kit, STD – 2007.5–2018 6.7L Cummins ISB
Premium replacement piston ring kit for the 6.7L Cummins ISB used in 2007.5–2018 Ram trucks and other B-Series applications. Built to OE form, fit, and function for reliable sealing, proper oil control, and long service life. Standard bore (STD).
- OE-equivalent sealing: Restores compression and oil control on stock engines.
- Direct fit: Designed for factory 6.7L Cummins ISB standard bore cylinders.
- Service-ready: Pairs well with fresh hone, new bearings, and gasket set.
- Trusted quality: Interstate-McBee aftermarket replacement components.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4955366 |
| Engine | 6.7L Cummins ISB (B-Series) |
| Bore Size | Standard (STD) |
| Cylinders | 6 (inline-six) |
| Intended Use | Stock/OE rebuilds and refreshes |
| Sold As | Engine set for one 6-cylinder engine* |
*If you require a single-cylinder ring set or an oversize, contact us before ordering.
What’s Included
- (1) Complete piston ring set, standard bore, for one 6-cylinder 6.7L Cummins
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Ram 2500/3500 – 6.7L Cummins ISB (2007.5–2018)
- Ram 3500/4500/5500 Cab & Chassis – 6.7L Cummins ISB (select 2008–2018)
- Other B-Series/industrial applications where Cummins/Interstate-McBee 4955366 is specified (confirm by ESN and bore)
Install Notes
- Measure cylinder bore and taper; this kit is STD only. Use the correct oversize ring set if the block has been bored.
- File-fit only if required to achieve proper end gap. Check every ring in every cylinder.
- Confirm ring orientation and placement (top/second/oil) per the service manual.
- Light plateau hone is recommended for proper seating; clean bores meticulously.
- Use proper break-in oil and follow manufacturer procedures.
Recommended/Related Parts
- Full engine gasket set (6.7L Cummins)
- Main and rod bearings (standard or oversize as required)
- Piston set (STD or oversize to match machine work)
- Head bolts or studs (replace torque-to-yield fasteners)
- Oil pump and timing components (inspect/replace as needed)
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping and hassle-free returns
- Deep inventory for 6.7L Cummins rebuilds and maintenance
FAQ
Is this the right kit for my 2007.5–2018 Ram 6.7L?
Yes, this ring kit is for standard-bore 6.7L Cummins ISB engines in 2007.5–2018 Ram trucks. For edge cases or mixed-year builds, verify by ESN.
What does STD mean?
STD = standard bore. If your block has been bored/honed beyond factory, you’ll need the correct oversize ring set.
Does this kit cover all six cylinders?
Yes—this listing is an engine set for one 6-cylinder engine. If you need a single-cylinder set, contact us.
Can I reuse my old rings?
Not recommended. Rings wear to the original cylinder and won’t reseat properly after a rebuild.
