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Henry,
Not sure what 4V heads you may be referencing.
The ones we are involved with have shown no issues to date and those engines were pushed hard in testing.
I went to the UK to personally inspect them and discuss our projects. So far we are pleased with the results and have upcoming projects we will be including them in.
Our Project 24 has morphed into a second in house project, Project 27, using these heads and a 993 engine case.
Good luck with what you are about to start. There are many here who will benefit from what you are doing.
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