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Old 07-31-2018, 11:35 PM
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FSJunkie FSJunkie is offline
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Join Date: Jan 09, 2011
Location: Not The Hot Part, Arizona
Posts: 4,004
If you mean to ask if you should replace your 090 heads with 291, the answer is "No".

The 291 casting developed a reputation as the head to have because of it's lower CC combustion chamber volume that produces higher compression with the same pistons. The caveat is the smaller combustion chamber shrouds the valves more and the reduced flow counteracts power gained by increased compression.

You are better off having a more open combustion chamber like the 090 heads and achieving increased compression with piston selection. That way you get both higher compression and better flow.
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