Rebuilding a 65 273..I need some help.

65TerrorCuda said

I wonder what he means by big valves.

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Good question. All the 273-318 heads had 1.78/1.50 valves You would need to use a 340/360 head to get bigger valves. For a low compression 273 you don't need a big open chamber and can't use the larger valves and larger ports.