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Old 03-28-2006, 01:46 PM
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Swapping Heads

I was told that putting 305 heads on a 350 block would increase HP, but risks burning a piston. Is this true, and if so, how much HP and how great is the risk?

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Old 03-28-2006, 09:13 PM
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The 305 heads will increase compression because they have smaller chambers. I don't know why they would "burn a piston".

HP increase? Depends on the rest of the engine.
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Old 03-28-2006, 11:23 PM
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Compression will be gained but at the cost of smaller valves in the 305 heads.
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Old 03-30-2006, 12:42 PM
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Dont waste you time with the 305 heads. They arent going to flow enough for your 350 ( small valves, small ports ). Opt for maybe some old camelbacks or a vortec head. Better flowing ports and bigger valves, plus with the 64cc chambers it should give you decent compression.
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Old 04-02-2006, 10:46 PM
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The "burning a piston" part of it could come from the higher compression and resultant detonation on pump gas.
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