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What's the difference?

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What's the difference?

Post #1 by Keepmy6 » Tue Oct 30, 2018 9:46 am

I'm new to this forum and I have limited mechanical knowledge. Big six, small six? What is the difference and does it effect the application of parts? I have a 250 I6 in a 73 comet.

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Re: What's the difference?

Post #2 by ludwig » Tue Oct 30, 2018 12:57 pm

Big Six generally refers to the 300 ci truck engine. Small Six is the Mustang/Falcon/Comet car engine, all the variants: 144, 200 and 250. The 250 is a stroked 200 with a taller block.

Other guys will share more specific data, but that is the basic difference. There is nothing interchangeable between the big and small six. Several things are interchangeable between the various types of small sixes, particularly the cylinder head/intake setup. There are advantages to using later parts on an earlier block: higher compression ratios, more transmission choices, different carb and distributor setups.

Get a copy of the Falcon Performance Handbook at the shop on this site. It will tell you almost everything you need to know for a good build-out. The rest you can get from the savants who post here regularly.

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