Help! advice needed with engine swap! 2.5D HSE

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also, as my old engine had the large pump casing ive had to build a sort of hybrid pump out the two parts, has anyone ever had the large pump casing machined down to fit the smaller aperture?

yep i had it done when i fitted a small hole m51 engine into a previous p38, had the correct 994 pump turned down to fit the hole.
should never swap the tops of the pumps they are set to thousands of a mm to far wont rev up then other end of the scale rev there nuts off!
some people have swapped tops with ok results but myself would rather it was done properly so i know its right especially when fault finding
 
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