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Same problem on a set of St6 heads, showed up to be leak between valveguide and head. Showed up on one cylinder, but after testing with kerosene, all of them leaked through. I made special spring cups supporting O-rings pressing between head and guide, have not tested yet.... If you look upon the design, there is not much material between valvespringseat and port. Should have been assembled with a sealing compund. My



I've had these heads for a long time without a problem before now. I just had the VJ touched up on the exhaust and 2.08 valves installed in the intakes.

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.