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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#46232 06/13/2005 1:36 AM | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | if you need a new head anyway, pull the old one and measure the bore - 3-9/16 = 235 and 3-3/4 = 261
also I've been told the threaded oil pressure sending hole in the drivers side of the block is 1/2" on 261, but smaller [3/8?] on the 235
Bill | | |
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