Posted by Tom Bowman on October 15, 2013 at 07:50:16 from (188.8.131.52):
In Reply to: to-30 over heat posted by Tony in Mass. on October 15, 2013 at 06:34:33:
Quoting Removed, click Modern View to see
I don't mean to hijack the thread, BUT, regarding the holes lining up for the passages: on the TO-20, coolant passages in the head look like "smiley-faces", but they line up with a single round hole in the block.
And, a large, oval-shaped oil passage in the block lines up with two small round holes in the head.
The head and the block are both labeled "Z120", so I'm sure they're the right parts, but it still looks funny.
Is there a reason for the different size/shapes?
The Fel-Pro 7558B head gasket has the "smiley-face" hole for the coolant passage, and the large, oval-shaped hole for the oil passage.
Here are some old pictures of my dirty block and head, to show what I'm talking about:
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