taken from a old post i saved


You don't need torun and efi block as you can use a sierra 1800 cvh bottom pulley and sensor and bracket, all direct replacements of 1600 items ( The pulley just needs a skim to make it narrower to clear the inner wing ) the pulley has the 36 - 1 teeth on it like the efi flywheel does so this can be used and you won't need to change your engine, doesn't this sound a bit easier?

Shopping list

1800 cvh crank pulley,
1800 cvh alternator pulley ( Uses thicker belt )
1800 cvh alternator bracket ( Skim 4mm of the side to move alternator over towards the driver side allowing all pulleys to line up exactly )
1800 cvh cambelt cover with crank sensor in it ( cut off just above the lower two bolt holes to allow the use of original top cambelt cover )

any questions just ask !!