The bigger size valves flow real good on a flow bench. Same can not be said when the head is on a running motor.
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| Help with valves for slant head https://www.slantsix.org/forum/viewtopic.php?t=31974 |
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| Author: | mopardemon71 [ Thu Oct 30, 2008 8:41 am ] |
| Post subject: | Help with valves for slant head |
Ok I got 1.72 chebbie valves now 11/32 stem single lock for the intake does anyone know what valve would be the next size up in diameter? I'm thinking 1.80 area but some where I saw a 1.78 valve. |
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| Author: | SlantSixDan [ Thu Oct 30, 2008 8:51 am ] |
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1.77" & 1.44" valves from Engnbldr. |
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| Author: | Joshie225 [ Thu Oct 30, 2008 9:34 am ] |
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Actually the Engnbldr intake is 1.70". 1.72 is actually a pretty good size. Going larger may not help and may even hurt performance. |
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| Author: | Charrlie_S [ Thu Oct 30, 2008 10:15 am ] |
| Post subject: | |
The valves enginebldr lists for the slantsix are 3/8 stem. Mopar demon stated he has 11/32 stem valves, now, that means he has 11/32 guides. I would contact engnbldr, and see if he has any 11/32 stem valves that would work. Also there is probably, a valve from a chevy distributer that will work. |
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| Author: | Shaker223 [ Thu Oct 30, 2008 10:26 am ] |
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You can always have the valve turned down to fit your application too. |
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| Author: | Doc [ Thu Oct 30, 2008 10:55 am ] |
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There is a 3/8 stem Mopar BB exhaust valve at 1.74 and an oversize at 1.80 I have used these as intake valves on Slants. As noted, you do not really need to go that big in order to get good flow. DD |
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| Author: | Dart270 [ Thu Oct 30, 2008 12:02 pm ] |
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SBC 1.72 valves work very well. SB Ford 1.78s are a good step up, but not necessary for most bore sizes and builds. Lou |
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| Author: | slantzilla [ Thu Oct 30, 2008 2:38 pm ] |
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The bigger size valves flow real good on a flow bench. Same can not be said when the head is on a running motor.
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| Author: | walpolla [ Thu Oct 30, 2008 3:47 pm ] |
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stainless valves ex : engnbldr regards,Rod 
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| Author: | sandy in BC [ Thu Oct 30, 2008 4:37 pm ] |
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Unless you are pepared to spend a lot of time to do what is necessary to make bigger valves work you are wasting your time. Optimize the 1.72s and then see where you are at. I have 1.72 intake and 1.50 exhaust valves in my motor and it took a lot of millwork/relieving to make that half right......... |
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