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Old 06-14-2004, 05:17 PM   #1 (permalink)
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Porting 460 exhaust ports- how far can we go ?

As can be seen from article at FM front page, 460 passenger car intake ports flow very respectable amount of air even in stock,unported form.Near to 300 cfm translates into roughly 600 hp potential.And this unported.
But the exhaust ports are the real problem here. How much can the shortside radius and the roof( the area around the valve guide)be worked on without the danger of making a hole to water jacket?
I am building a street 460 for a buddy´s 65 Galaxie( 10:1 compression, CC 292 Magnum hydraulic cam , Weiand Stealth intake and 1973 pass car heads (decked, new guides, adjustable valve train,guide plates)larger stainless exhaust valves).
By the way are the exhaust port plates still widely used ?
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Old 06-14-2004, 06:17 PM   #2 (permalink)
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Porting 460 exhaust ports- how far can we go ?

i went thisBIG.dont know what they flow yet


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Old 06-14-2004, 08:26 PM   #3 (permalink)
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Porting 460 exhaust ports- how far can we go ?

Here ya' go... How to port 460 heads.

http://www.reincarnation-automotive.com/

edit....

Well, nevermind... It looks like things have changed at that website. He now wants people to pay, and many of the pictures require some sort of .NET password to view???

It use to just have a lot of good info that was easily accessible. It's a cobbled up mess now with stuff overlapping, etc.


Good Luck!

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[ This Message was edited by: n2omike on 6/15/04 7:38am ]

[ This Message was edited by: n2omike on 6/15/04 7:38am ]

[ This Message was edited by: n2omike on 6/15/04 7:40am ]
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Old 06-15-2004, 12:14 AM   #4 (permalink)
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Porting 460 exhaust ports- how far can we go ?

That site is well worth the one time fee. Go to www.network54.com/Forum/85220 to get some feedback from people that have taken his advice. Look for Scott Johnston aka the mad porter.

You CAN overport the exhaust. It will still flow better than stock, however it will not hold a candle to a properly ported exhaust port.


Just my 2 cents,
Greg
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Old 06-15-2004, 12:51 PM   #5 (permalink)
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Porting 460 exhaust ports- how far can we go ?

It all depends on the casting number on the head. The early heads can take a little more work & yeild a lot more gain. The later heads are not worth the trouble to port. I lost all the pics I had but still have flow numbers somewhere.
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Old 06-15-2004, 01:36 PM   #6 (permalink)
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Porting 460 exhaust ports- how far can we go ?

Yeah the C8VE, C9VE, and DOVE heads were all good years for passenger car heads. The D3VE heads can also be made to work with a lot of work. I guess its gonna come down to application although there are a couple of guys going fast with the D3 heads. I believe the D2VE heads were the open chamber heads that werent worth squat.

If I remember right the important thing is to not do anything with the floor of the exhaust port as it is too low to begin with. The bowl should be opened up only to 80% of the valve area. Also try to keep a constant area all the way down the port. This keeps velocity up. The less the air has to expand and compress down the port the less turbulence you are going to see. Also keep in mind if you go too big on the exhaust port the header gasket is not going to have much to set on.

The only thing I regret after porting my heads is that I went a little too wide because I intersected the header bolt hole, which really wasnt a big deal but I had it filled with nickel rod anyway. Also I ground down the boss for the exhaust valve flat when it actually works better when shaped into a vane.

Like I said for 25 bucks there is a good amount of info on Scott's site. He is flowing as well as if not better than anyone else out there using stock iron heads (stock iron head vs stock iron head). Most importantly he has flowed the heads during the porting process so you can see what changes net the most improvements.

Greg

[ This Message was edited by: gregh429 on 6/16/04 12:39am ]
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Old 06-20-2004, 11:57 AM   #7 (permalink)
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Porting 460 exhaust ports- how far can we go ?

Thanks for the info guys.What´s the combustion chamber size in D3 heads?
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-66 Fairlane GTA 390 tripower near completed.
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Old 06-20-2004, 03:58 PM   #8 (permalink)
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Porting 460 exhaust ports- how far can we go ?

http://www.reincarnation-automotive....r-index-1.html
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