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17:54:45 - 11/14/2024
V6 Dakotas
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Huggins
Dodge Dakota
JOIN HERE
5/17/2006
23:28:15
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 Subject: Cylinder Head Flow Numbers
IP: Logged
Message:
Hey, I'm just curious... Has anyone on here actually had their heads flowed after they went in and did their minor port work to see if they actually gained anything or for that matter has anyone actually flowed their heads at all... Performance places such as Hughes Engines and KRC Performance are more than welcome to post their flow numbers as well even if you have to get them from a 318 cylinder head "must be a magnum head", because the 318 is an almost identical port cylinder head... If possible I'de like to see the numbers all through-out the lift points of the valve such as .050", .150", .200", .350", .450" & .520"... I went with .520" because that is max lift for the cam and rocker combo I'm running, so if you like just post the lift numbers and go up to .600" if that's what you flowed to... The flow numbers must also have come from the 28" of water mark too, so no cheating... If you are using a bigger valve, please state it if you don't mind so we can keep things as accurate as possible... The flow numbers I have thus far been able to obtain with the stock valve and valve seat are as follows starting with the stock port flow numbers...
Stock
.050" = 32.1 CFM
.150" = 102.5 CFM
.200" = 132.8 CFM
.350" = 172.7 CFM
.450" = 181.5 CFM
.520" = 183.0 CFM
Ported
.050" = 31.9 CFM
.150" = 101.7 CFM
.200" = 136.6 CFM
.350" = 202.2 CFM
.450" = 227.8 CFM
.520" = 223.1 CFM
As you can see my ported intake hits a wall or stalls out in other words, which I know why and will be shortly fixing along with greatly changing the entire runner... Any flow numbers would be greatly appreciated, that way I can kinda see what the performance guys are getting and I will know a little more as to what I need to strive for...
Oh some other things I would like mentioned are what size bore adapter was used and wether or not an adapter was used on the port itself... My bore adapter was a 4" with no port adapter...
Again, thanks for posting any numbers...
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J and J Auto
GenII
5/21/2006
01:01:42
|  RE: Cylinder Head Flow Numbers
IP: Logged
Message:
I think the fastman has some flow charts on his
site yes the V6 and 318 heads the ports are almost
identicle
If you start porting the V6 heads the low end will
drop off real fast as your numbers shows slightly
depending on what your doing and how you plan to
run the motor the top end can have some nice gains
My 4.0 stroker is ported radicly with stock valves
vertualy no power under 2000 rpm but I am running
a 2200 stall and 4.10 gears to solve that prob
I really wish I would have increased the valve
size 309/322 at the wheels I may have gotten
another 20 25 hp there above 3000rpm she really
comes to life
Thats one thing I never invested in was some bench
flow equipment wish I would have
To me tools are just like gold an investment and
one can never have to many tools
Larry
J&J Auto
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Huggins
Dodge Dakota
JOIN HERE
5/21/2006
01:20:21
| RE: Cylinder Head Flow Numbers
IP: Logged
Message:
Right you are, but these kind of tools tend to get very pricy:))
Actually the port numbers I have posted above are from a radically ported port, but I'm fixing to go in, after I calibrate my own self made flow bench, and completely remove the entire runner side where the pushrod is... I will be using a tube to feed the pushrods through and removing even the part of the runner where the rocker stud is "this is actually the wall I was referring to earlier that was hurting my flow numbers"... Right now with the current port design the port can't support air flow for the stock valve size much less a bigger valve... It tends to get very constricted even after going in and opening it up... After this I may possibly go in and start playing with valve sizes, but for the time being, I have more problematic issues to attend to...
I will try to find the other flow numbers you were referring to...
Thanks for your input Larry...
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Huggins
Dodge Dakota
JOIN HERE
5/21/2006
01:36:39
| RE: Cylinder Head Flow Numbers
IP: Logged
Message:
Ok found the website and I just have to say, 265cfm at .500" lift is almost remarkable... There is something a little funny about their stock intake though, because it didn't flow anything like what mine did, but then again they were flowing a 360 and not a 318 or v6 head... Also they were using a bigger than "stock" valve... I guess they would show the best improvements of the three plus there's obviously more people out there buying heads for the 360 over the v6 after all, so why not right://
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