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41Fordor · 12-26-2010, 08:53 AM

Can easily be bored to 3 3/16 (239 standard) with the sleeves removed. With the smaller heads this gives a good compression ratio. That's what I've got.

12-26-2010, 08:53 AM	#3
41Fordor Senior Member Join Date: May 2010 Location: Cheyenne WY Posts: 187	Re: Is a 21A flathead desirable? Can easily be bored to 3 3/16 (239 standard) with the sleeves removed. With the smaller heads this gives a good compression ratio. That's what I've got.