LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

unshrouding valves on LT1 heads...cc change?

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Old 01-01-2004 | 02:32 AM
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dhirocz's Avatar
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unshrouding valves on LT1 heads...cc change?

Just wondering what you guys who run ported heads with unshrouded 2.02/1.6 valves get for chamber size with .010 milled heads. Need to know an aproximate number so I can finish my motor. Thanks
Old 01-02-2004 | 01:30 PM
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With the number of responses, it may become obvious the answer is debatable. It will depend on what the cc of the heads was to begin with, (54-57 1/2) and how much/to what degree of unshouding you actually do. 010" removal is worth about a cc and a half, so now the heads are 52 1/2-56 plus a guesstimate of 1 to 2 1/2 cc stock removal for unshouding. So now you end up with anywhere from 53 1/2 to 58 1/2.

Last edited by arnie; 01-02-2004 at 01:32 PM.
Old 01-02-2004 | 09:36 PM
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Oh well...gives me an idea...I guess the best thing to do is use a burette and figure it out. Kinda beats the point of using LT1 heads though, unless I deck them further, which I really dont want to do...
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