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Timetraveler · 01-07-2017, 05:22 PM

GM did use some blocks for 3.875 and 4.00 such as the 3789817 is a 62-67 327 block but I have one that is 3.875 and was used with a 3.00 crank for 283 in 1966. This makes for a very thick cylinder wall but leaves a lot of room to bore.

01-07-2017, 05:22 PM	#3
Timetraveler Member Join Date: Aug 2002 Location: Florida Posts: 103 Likes: 79 Liked 12 Times in 6 Posts	Re: block Id GM did use some blocks for 3.875 and 4.00 such as the 3789817 is a 62-67 327 block but I have one that is 3.875 and was used with a 3.00 crank for 283 in 1966. This makes for a very thick cylinder wall but leaves a lot of room to bore.