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Head Flow and Bore Size

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Old Feb 23, 2006 | 12:33 PM
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Silver-Dollar's Avatar
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Default Head Flow and Bore Size

How does bore size effect head flow? Being the eternal optimist, I am always looking at different cylinder heads. I notice that most flow numbers are through 3.90 or 4.0+ bores. Being that I have a bore size of 3.78 (5.3l), how much can I expect the flow numbers to drop?

Would a good guess be about 3%? 3.78/3.90 or 378/390

Last edited by Silver-Dollar; Feb 24, 2006 at 06:34 AM.
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Old Feb 23, 2006 | 02:20 PM
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Originally Posted by Silver-Dollar
How does bore size effect head flow? Being the eternal optimist, I am always looking at different cylinder heads. I notice that most flow numbers are through 3.90 or 4.0+ bores. Being that I have a bore size of 3.78 (5.3l), how much can I expect the flow numbers to drop?

Would a good guess be about 3%? 3.78/3.90 or 370/390
There is no set formula. Valve location and size will vary the reuslts. So will chamber design and valve job. Best to test the heads on the bore size you're running.

Ed
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