C20xe porus head mod

[total_vauxhall]

Can anyone add the link to the instructions for fitting the tube and the sizes . I have got a spare head im about to send away for machining but fancied doing this mod to future proof it only problem is now i cant find the thread anymore

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[Stuart]

https://www.migweb.co.uk/threads/thought-id-have-a-go-at-the-porous-cracked-head-modification.340906/#post-3505511