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| 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!
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#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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