North American Turbocoupe Organization



1987 new engine head problems
bigep74 Offline
Junior Member
#1
Hello everyone and how is everything. . so here is what happened brand new crate engine (a few mods lol) from Texas installed at my local speed/turbo shop . ran great and strong 1,000 miles later first oil change . 200 miles later oil everywhere after checking the dipstick is lifting out under boost (24pounds) . So then under normal driving the same issue low boost (10 pounds or less) . So I did the easy stuff first PVC ( motorcraft EV127A) catch cans changed every line on the vehicle even that hard to get to block breather under the intake no change . So did compression test and that was all good . pulled the valve cover off and I could see all the valve seals sitting inside the spring. So I pulled the head and took it to the local machine / speed shop here in town. and not one valve had sealed and all of the valve seals where just floating on the valves inside the spring

Just wanted to share the story with everyone and say watch the valves
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bigep74 Offline
Junior Member
#2
Just a update the local machine shop discovered all 8 valves where warped , and the valve seals where all the wrong size!!! they was actually the factory size seals and the head had larger valves installed . but everything else was good
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