OEM stock lengths for all series are now available as shelf-stock items. The Brand is RCD
Due to the overall length of the Stock 6.0 and 6.4 pushrods being almost 10 inches, we feel the strength of the OEM pushrods are not adequate for anything other than a stock vehicle. When the stress on the pushrod surpasses what is considered a reasonable window of operation, the OEM pushrod is not designed to support the additional load that the valve train system is experiencing.
If you have made any changes to the engine requiring custom length pushrods, we sell pushrod length checking tools with proper ball radius’ to replicate the OEM pushrod in both the 6.0 and 6.4 engines. Correct pushrod length will allow you to keep stock rocker geometry and therefore ,allowing the scrubber pad of the rocker arm to correctly ride the contact area of the valve bridge. If the pushrod length is not correct, it will change the pre-load of the hydraulic unit to be incorrect, resulting in premature failure.
All in all, pushrods are a very important link in the valve train that are often overlooked at the expense of performance and service life.
Note of interest: Ford has decided to supersede the original 6.0 pushrod length of 9.850 and is now going to supply only one length pushrod for both the 6.0 & 6.4 engines. We would suggest this superseded length for anyone with the stock 6.4 engine combination.