As of 7-1-25 we are now offering complete new T4 heads direct to the public for all Type-4 applications. Contact us for details. https://hamheads.com/home/
We stopped working with used bus heads in 2007 because more than half of the heads sent to us had terminal cracks deep inside the exhaust ports. These heads suffer greatly from extreme heat and countless heat cycles. A hefty percentage had been abused by other shops. With new, beefy AMC castings available at a price point lower than costs associated with cleaning, the most basic casting repairs (they all need some), even if the heads looked okay, this move to new heads was a no brainer.
At the end of 2013 we made the decision to stop working with used 914 and 912E heads as well. That year, of the dozen or so pairs sent to us for inspection, only three pairs met our strict criteria for remanufacture. The primary offense being hack work by other shops and heat related damage.
hamheads.com 