water passage on the front of the head going into the block is different between 2.5 and 3.0. The 2.5 one is inset towards the back of the head like a regular 2.5 head. 3.0 is even with front of block like the 2.7 motor.
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'95 993 Monster in the making
'89 S2/Turbo aluminum grill monster: terrorizing another state
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