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jlsanborn · 02-14-2014, 01:53 PM

The 402 is a 4.125 bore. I've heard of people boring those to 4.25 for 427.

02-14-2014, 01:53 PM	#78
jlsanborn Registered User Join Date: Jun 2011 Location: Spokane, WA Posts: 2,367	Re: Jason's 70 Big Block SWB Project The 402 is a 4.125 bore. I've heard of people boring those to 4.25 for 427. __________________ '77 K30 3+3 - "The Crummy" http://67-72chevytrucks.com/vboard/s...d.php?t=640134 '67 C10 L/SWB - Soon to be daily driver! http://67-72chevytrucks.com/vboard/s...d.php?t=471776