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#76907 04/30/2007 9:36 PM | Joined: Oct 2006 Posts: 20 Apprentice | | Apprentice Joined: Oct 2006 Posts: 20 | I have been told a number of times that the 235 head, serial number 848 is a better selection for the 261 engine, because of higher compression. Are there any pitfalls with this match up, anything that I should be aware of. I found a 848 head and I have a 261 block and crank. | | |
#76908 04/30/2007 9:46 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | There are some extra holes in the 261 block between the cylinder bores. These need to be added to the 235 head to allow for proper cooling.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#76909 05/06/2007 2:01 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | The 850 head is the 848 for 261s.
If you use a 848 head you'll have to drill the two holes for the steam vents.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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#76910 05/06/2007 2:23 PM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | |
#76911 05/07/2007 7:20 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The 850 and 848 head have the same port sizes, combustion chamber shape, and valve size. The 850 just has more meat to lower the compresion on the 261. Don't expect any more flow out of the 848 head, all you are going to get is a smidge more compression, which makes a bit more torque.
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#76912 05/07/2007 9:16 PM | Joined: Dec 2005 Posts: 2,557 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 2,557 | Here is a picture of my 848 head that has had the coolant holes drilled for a 261 block. There are three pairs of holes, hope this helps you out. 848 head coolant holes drilled for a 261 block
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