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Adger Smith · 10-01-2023, 11:49 PM

MH or Industrial blocks have a water hole for spark plug cooling passages that are in the MH or industrial heads. They are easy to spot.
If you find a block try to get one that has the Dash end number(-1) closer to one or zero.
The higher the dash number the more mold/casting modifications. Closer to zero or 1 is usually a block that has been cast matching the original prints. A -1 could be a lot better core than a block with a -15 on it.
Sonic testing is important

10-01-2023, 11:49 PM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 1965 426 wedge MH or Industrial blocks have a water hole for spark plug cooling passages that are in the MH or industrial heads. They are easy to spot. If you find a block try to get one that has the Dash end number(-1) closer to one or zero. The higher the dash number the more mold/casting modifications. Closer to zero or 1 is usually a block that has been cast matching the original prints. A -1 could be a lot better core than a block with a -15 on it. Sonic testing is important __________________ Adger Smith (Former SS) Last edited by Adger Smith; 10-01-2023 at 11:55 PM. Reason: add