Just in case you might want to try some home porting on the 289 heads you might want to read this and check out lots of pictures.Technical How To:Basic Cylinder Head Porting for Beginners - THE H.A.M.B.
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Just in case you might want to try some home porting on the 289 heads you might want to read this and check out lots of pictures.Technical How To:Basic Cylinder Head Porting for Beginners - THE H.A.M.B.