Volvo 530 head differences

Hello,

I have been asking this one for a while and no one seems to have the answer.

Does anybody know what is the purpose of these indents inside the 530 head.

http://www3.sympatico.ca/borism/Headwork/Headnotch/93530NOTCH.gif

Is a 530 head from 93 non turbo

the indent on the side opposite to the sparkplug is much smaller than in

http://www3.sympatico.ca/borism/Headwork/Headnotch/91T530NOTCH.gif

which is also 530 head from 91turbo

1. Are the indents different because one head was on a non turbo (smaller
indents) and the other two were on a turbo.

2. Are the indents different because they updated the molds?

3. Why are they there in the first place?



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs http://www3.sympatico.ca/borism/
Aurora, Ontario

 

My guess is that they are reference points cast into the head for measuring
when machining the head.


Harold