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Cylinder head CC question

Old 02-10-2006, 08:34 AM
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Default Cylinder head CC question

Does anyone know if the Mark IV cylinder heads for the 365 mag and 330 "peanut port" heads have the same CC volume?
Gary
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Old 02-10-2006, 11:06 AM
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Default Re: Cylinder head CC question

I believe they are both 119 cc or thereabouts. You can check the casting numbers on www.mortec.com.
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Old 02-10-2006, 11:15 AM
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Default Re: Cylinder head CC question

.. ..also casting will vary from what the OEM specs are. One pair listed as a 119cc may be 122cc and another set may be 124cc. If you are boderline on a safe compression ratio your best bet is to have the heads CC'd.
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Old 02-10-2006, 11:17 AM
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Default Re: Cylinder head CC question

Thanks,
Just wanted to know if swapping heads would change the CR.
Gary
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Old 02-12-2006, 10:37 AM
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Default Re: Cylinder head CC question

Magnum heads should be Rectangular ports. The best bet would be to get the casting numbers and check mortec. I replaced my peanut port 118cc heads with a set of Large Oval (820s)110cc heads and picked up compression. You can CC the heads yourself with a piece of plexiglass some grease and a surenge. This will give you a pretty close estimate. You could have your heads milled down and pick up compression you may drop 3-4 cc's and pickup .3 compression points.

Last edited by jeffswav; 02-12-2006 at 10:43 AM.
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