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What is biggest valve possible for 3.9" bore?

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Old 03-20-2007, 03:33 PM
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Default What is biggest valve possible for 3.9" bore?

Sorry guys, I used search, but couldn't find the info I needed. I have a set of supposed Katech stage3 heads that just came with a car I bought. They have 2.08/1.60 valves. Will these fit the 3.9" bore of the 347 forged motor I'm building? Also, I don't see any marking on these heads saying what brand they are so I'm not positive they are Katechs, that's just what he told me.

Thanks for any info,

Gary
Old 03-20-2007, 03:40 PM
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2.055 would be the biggest I would use. A 2.08 valve would have severe bore shrouding and would cut your flow down to below what a similar port with a smaller valve would flow.
Old 03-20-2007, 03:54 PM
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Originally Posted by Ratical
Sorry guys, I used search, but couldn't find the info I needed. I have a set of supposed Katech stage3 heads that just came with a car I bought. They have 2.08/1.60 valves. Will these fit the 3.9" bore of the 347 forged motor I'm building? Also, I don't see any marking on these heads saying what brand they are so I'm not positive they are Katechs, that's just what he told me.

Thanks for any info,

Gary
What size cam are you going to run in that thing?
Old 03-20-2007, 05:26 PM
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Def too big.
Old 03-20-2007, 09:39 PM
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Originally Posted by marv
What size cam are you going to run in that thing?
Magic stick 4.




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