Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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There are o-rings at the fittings where the hoses go into the HPOP and where the fittings where the hoses go into the heads (the hoses themselves don't have o-rings as therey are flared). Here are the factory part numbers for those:
(Ford) 5C3Z-9N693-A, (International) 1823790C1 (o-ring for HPOP hose to pump joint)
(Ford) F4TZ-9N693-A, (International) 1815874C1 (o-ring for HPOP hose to head joint)
They are regular (I want to say the might be) -5 and -6 o-rings, but whatever the size, make sure you use Viton o-rings. I had one of the HPOP fitting o-rings blow and lost 4 quarts in 10 miles (as usual my wife was driving it at the time). Cheers!
1997 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, External Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed
SOLD - 1994 F350 CC DRW 2WD PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, DPPI DP, Bilsteins, $12 AIC, Coolant Filter, Explorer Overhead Console, A-Pillar w/ISSPRO Black Ice, EV Boost, and EV Pyro, Modified Pedestal, Gutted EBPV.