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Re: Fel-Pro 3mm & 4mm intake gaskets Ford 3.8
Posted to Technical Discussion Forum on 1/8/2007 2 Replies

Hi Damie,

I just did one of the Friday using the 4mm set. If you read Ford TSB #99-20-7 it should answer your question.

Ford released an updated thicker gasket because of sealing problems on this engine, so Fel-Pro followed suit with their 4mm set.

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