Broken Camshaft Caps on the 3V Cylinder heads are unfortunately all to common. The poor quality cast material is weak and brittle. Adding aftermarket valve springs and high lifts camshafts pushed them to limit. Or, a simple valvetrain failure can cause you to scramble to find a replacement cap! MMR now has the answer.
The MMR cam caps are produced from aerospace Billet Alloy and feature increased cross sectional thickness to handle the highest of valve spring pressures. Increased stiffness means better performance and less loss through cam caps that are flexing upwards loosing valuable camshaft lift.
Camshaft Line boring is required with these. The tool is available for purchase or you can send your cylinder heads to your local machine shop.
If you have had a rear cam cap break, you MUST check the camshaft for run out. When the rear cam cap fails the cams can and will bend because they are unsupported. Failure to check this can and will damage the cylinder head and cam caps again!
2005-2010 Mustang GT 4.6L
2005-2010 F150 F250 F350 Expedition 4.6 & 5.4
ALL 3V engines including 6.8 V10
Includes 8 cylinder head caps to complete 2 cylinder heads (front cap does not require replacement because there is no upward force exerted upon it, this is because the timing chain is constantly pulling it down towards to crankshaft as the engine turns.
Laser etched for identification to aid in cam cap location (2-5 low to high from front)
Integrated Dowel with tighter tolerance to locate cap better under extreme pressures.