PATENT PENDING Unfortunately the 5.0 Engine was never designed for racing fuel operation (c16, q16, E85, methanol 100 octane and octane boosters), the plastic secondary guides are softened quickly by chemicals contained in these fuels that eventually make their way into the oil past ring gaps to the point of failure as shown below. Furthermore increased valve spring pressure and load from aftermarket camshafts and cams place the part under extreme load. This causes secondary chain failure and ultimately catastrophic engine failure.
MMR has the answer for these applications with its new Patent Pending Heat Treated Billet steel guides. The MMR guides completely eliminate this problem. The MMR chain guides are lubricated by oiling holes to prevent wear and utilize a unique design that rolls on the chain rollers rather than sliding on the links to all but eliminate wear and decrease friction and ultimately provide reliable operation for both street and strip vehicles. These guides are suitable and recommended for ALL Fuel types. 2 Guides included for 1 engine. Direct replacement. Plug and Play.
Provisional Patent Number 62/647,350
2011-2020 Mustang GT
2012-2013 BOSS Mustang
2011+ Australian 5.0 Models
*This is a heat treated steel part and moisture or human handling can cause minor surface rust (like a brake rotor), This does not affect performance of the item in ANY way and is no cause for concern. This item can show minor heat discoloration and wear pattern after initial break-in due to metal on metal friction and is no cause for concern.