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OK... Let me preface this thread by saying that I am totally new to playing with MoPars so my knowledge is small and my questions will be many over the coming months. Whats the easiest way to tell the difference between a 170 and a 225 slant six? I'm shopping for a replacement engine...

I have a 63 Plymouth Valiant with a 170 motor in it. I discovered recently that the exhaust manifold broke from age in 2 places. My questions are: Will a 225 head bolt up to a 170 motor so I could use a header? I read a bit about others talking about stroke difference in the engine. Whats this...