[Vwdiesel] Is a 1.5 diesel head interchangeable with the 1.6 diesel head?

[LBaird119 at aol.com]

In a message dated 2/13/2010 7:45:16 AM Pacific Standard Time, 
tonyandlillie1 at earthlink.net writes:

> It all depends on the head bolt size. The 1.5's use the smaller bolts, as 
> do the early 1.6's. Sometime they changed teh 1.6 to the larger bolts, I 
> think it was in 82. I know for a fact my 1.6 1982 Jetta used the larger 
> bolts, and the 1.5 head I had I needed to bore out to accept the bolts from the 
> Jetta. So, you need to know what size the holes are for those bolts. Other 
> than that, they should be compatible. Unless I'm missing something??
> 

  The oil return holes are different.  1.5 head has small return holes, 
11mm bolt holes;  '81 head has large return holes, 11mm bolt holes; 
'82 on has large return holes, 12mm bolt holes.
  What's his name (dieselparts.com?) sells a bushing to seal up the 
larger hole (front, center) when putting a large hole head on a small 
hole block or vise versa.  Otherwise you'll get a big oil leak.
    Loren