Thread: Do the 351M heads have larger valves?
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Old March 15th, 2015, 04:22 PM
bigblockv6 bigblockv6 is offline
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Default Re: Do the 351M heads have larger valves?
Magnum heads do have larger intake and exhaust valves from the 305 heads but will also lower the compression when installed on the 305. Also all Magnum heads are the same regardless of the engines displacement. You would be better off replacing the 305 with a larger 351 or 401M V6.
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