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'83 5kt Engine and head specs



I've been posed with an interesting possibility and wanted to get some 
opinions on it.   In searching for an MC motor for transplant into my '83 
CGT, I've come across a 1983 5kt for free.   Checking the specs in my 1982 
Audi brochure, I see the '82 5kt has the same size engine (2144) with 79.5 
bore x 86.4 stroke.  Interestingly enough, this seemed awfully familiar, and 
sure enough that matches the specs given two columns over for the CGT.  
However, compression for the turbo is given as 7.0 to 1 whereas the CGT is 
8.2 to 1; indicating to me the difference is in the head.  Is this true?

Although in the end (assuming no other modifications which would not be 
true) I'd have a 130 hp CGT instead of 165, it seems this would make the job 
simpler, and damn cheap in comparison considering the donor car would be 
free...  (Question:  what am I missing here?)

Would it be possible to swap heads between the two engines, use my exisiting 
block and existing CIS (and wiring), and add the turbo, downpipe, related 
parts etc...?  Has anyone any experience / documentation on a conversion 
like this?

Thanks for any comments,
Alan

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