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Click on image for the lowdown. 
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| | | Forums66 Topics128,049 Posts1,055,552 Members48,425 | | Most Online14,466
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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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Yes, 261 heads have 6 extra coolant passages to match up with the coolant passages in a 261 block; however, it should cause no harm if they are blocked by the 235 head gasket and 235 engine block. | | |
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