Head Dowel Sizes 6.0L PowerStroke® Diesel

Not sure what size dowels you need? This should help you.

18mm Dowels
18mm head dowels were used from Model Year 2003-2006.5 and had casting numbers - 1843080C1 thru #######C4. Example: a 2006 Model Year truck that was built in 2005, came with 18mm head dowels from the factory.

20mm Dowels
20mm head dowels were used for Model Year 2006.5 & 2007 with the casting #1855613C1. The rocker box bolt size and location changed, along with the fuel injector holddowns and are not directly interchangeable with the components for the earlier 18mm dowel engines.

SRH (Service Replacement heads) Dowels
SRH (Service Replacement heads) these heads are a 20mm head dowel casting #1855613C1, but the top is machined to use the earlier rocker boxes and injector hold-downs from the 18mm dowel engines. These were made by Ford for use on the earlier engines that needed heads replaced after they had switched production to the newer castings. These heads are the intended use for the 18-20mm stepped dowels, since they have 20mm dowel holes, but are supposed to mate to a block with 18mm dowel holes.

Refundable Core Charges

The Refundable Core Charges are refunded as soon as we determine that your heads are useable for remanufacture.

Factors which eliminate heads for core use include:

  • heads that were previously machined too thin
  • prior and severe cracks which are not repairable
  • prior deep cracks extending below seat areas
  • prior fuel in coolant injector hole cracks
  • prior o-ringing (unless performed by UCF)
  • heads that have been drilled and tapped for coolant return lines

Many smaller cracks in the seats are eliminated by replacing the seats and are usually fine.

We can also repair some cracks in the deck surface using Lock N Stitch® pins, but are unable to repair cracks which extend into injector holes, glow plug holes, or deep into a port.

Your core must be returned within 45 days of receiving your heads. Cores received after 45 days will NOT be eligible for refund and may be returned at buyer's expense.

Yes, this means you may not receive your full refund if your heads are not useable to us. We need heads that we can remanufacture and would need to purchase useable cores if returned heads are unuseable. If you believe your heads might not be useable, we offer the NO CORE option which reduces the price to cover us purchasing good cores and eliminates you prepaying for return shipping of your cores. You can also call or message us about your core concerns.

We DO NOT accept Chinese castings for cores.