Coolant feed line, different sizes?

[GLHandGTS]

I went to put my coolant feed line for the turbo on my longblock last night and ran into a problem. My line didn't match up to my new common block for some reason... did they change over the years? Did the thread going into the block change from early gen motors to later common blocks?

Aaron M
'86 SC
13.4 @ 114, 2.5 60'

[als]

is there a fitting there that the line go in to? the line won,t go into the block . als