Compression Ignition Addict
Join Date: Oct 2011
Location: Tehachapi, CA
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I'll assume you thoroughly cleaned the surfaces of both the heads and manifolds before applying the sealant. Here's what I have on the sealants:
Intake Plenums: Motorcraft TA-30 (used to be Ford part F7AZ-19554-EA)
Everything else (oil pan, etc): Motorcraft TA-31 (used to be Ford part F5TZ-19G204-AB)
I'm guessing that maybe you have the 8-bolt manifolds vice the later 10-bolts? Maybe you need to add a "bridge" on top of the manifold to help stiffen them up (at least across where the 2 additional bolts are on the later versions ... is that where they are blowing?). There are billet manifolds out there, but I'll guess that they would be the later 10-bolt models and would need to have the extra 2 sealed up.
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.