1968 318 questions

Justin Sykes said
I recently scored a ‘68 318 for my ‘69 Dart. I’ve heard lots of good things about the earlier 318 blocks being beefier and the ‘68 318 having 9.2-1 compression ect ect. Anything special about the crank or rods? I also noticed it has open chamber heads, so if i put my closer chamber 302 heads on what kind of compression might I be looking at there? Blocks getting torn down and rebuilt, but i’d just like to know what to expect to find. Thanks all!

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the 1968 heads are they 675 casting heads? if so I mill .025 to .030 off then and use those instead of the 302 heads and sell them to someone for 300 or 400. They are not up to open chamber heads standard without some work, chamber and intake port work. A #675 head is a superior head in terms of flow and flow potential AND durability. The 302 is like a fast burn chevy head... great idea that's destroyed by penny pinchers who wanna save $ by producing thin castings. The 302 heads problem is a multitude of things... shrouding, cracking, they came on trucks mostly if not exclusively and therefore have the non passenger car valves which are heavy and bulbous at the stem transition to head and impede flow.
They can be made good, but it's not worth It when you can't escape the cracking. If you dont have a flow bench to work with them...you're guessing and could be doing work for a 1/4 the return.

Those pistons, look like badger or sterling brand. Clean the center and look for an overbore stamp, I think it's been rebuilt.