Porting stock intake...

Fox Hound · 08-09-2002, 12:45 PM

Anyone know of any good links to that shows how and where to port the stock upper and lower intakes? Extrude honing would be nice but too much $$$$.

chris91LX · 08-09-2002, 01:32 PM

I've seen articles about people who actually cut the intake in half to port it, mostly guys who are doing alot of street racing and want to appear stock. I can't remember where I saw them, but if I find them I'll post it up. FWIW I don't think the stock intake is worth porting. IMO you could port the crap out of it and it might flow as well as a stock Cobra intake. If you look at a sisde by side comparison of the stock intake and a Cobra, you'll see what I mean. Your better off saving for a Cobra or another aftermarket intake IMO.

RPM427 · 08-09-2002, 02:03 PM

To port the stock intake is a lot of work. It is not worth it most of the time, but if you really want to do here is a breif description how.

To port the lower you can run a bead of weld along the top of the intake tract. That gives you more materail to remove from the inside. Now you need to gasket match the intake to your heads. There are lots of articles online explaining that.
If you still have stock heads, porting your intake will not improve performance, the stock heads are the bottle neck.

To port the upper, cutting it in half is only way top do it right. That way you can access the ports inside the intake. Edelbrock is nice enough to make an access cover on thier intakes for this purpose. This is alot of work becase you need to be able to weld it back together.

You have to make sure you removed the same amount of material from each intake tract otherwise is will not be balanced. You will also need to match up the upper and lower tracts perfectly and then make a new larger gasket. Or design the intake tracts to fit a truck/holley upper-to-lower gasket/spacer.

eatsgmcar · 08-09-2002, 03:48 PM

Buy an old (used) E7TE head.
Cut the head in straight line over the center
of the intake and exhaust valves. You ll know
exactly where and how thick you can remove
the material.

I did 12.723 @ 105.93 mph with stock ported
head.

Regards,

Fox Hound · 08-09-2002, 04:00 PM

Gee, this sound like more work then it is worth. I guess its probably easier just to get an aftermarket one. Thanks for the replies, though. If it was cheap and easy I guess everyone would be doing it, huh, and since everyone is buying an aftermarket intake there must be a reason for it...

RPM427 · 08-09-2002, 05:41 PM

eatsgmcar: He is talking about ported the stock intake manifold - not the heads.

08-09-2002, 12:45 PM	#1
Fox Hound Registered Member Join Date: Nov 2001 Location: Bay Area, CA Posts: 58	Porting stock intake... Anyone know of any good links to that shows how and where to port the stock upper and lower intakes? Extrude honing would be nice but too much $$$$.

08-09-2002, 01:32 PM	#2
chris91LX Registered Member Join Date: Oct 1998 Location: Suburban Chicago, Hanover Park Posts: 695	I've seen articles about people who actually cut the intake in half to port it, mostly guys who are doing alot of street racing and want to appear stock. I can't remember where I saw them, but if I find them I'll post it up. FWIW I don't think the stock intake is worth porting. IMO you could port the crap out of it and it might flow as well as a stock Cobra intake. If you look at a sisde by side comparison of the stock intake and a Cobra, you'll see what I mean. Your better off saving for a Cobra or another aftermarket intake IMO. __________________ My Ford Club http://www.midwestfords.org/ Best time N/A 12.9 @ 107 1.711 60' 125 shot - 12.04 @ 113 1.59 60'

08-09-2002, 02:03 PM	#3
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	To port the stock intake is a lot of work. It is not worth it most of the time, but if you really want to do here is a breif description how. To port the lower you can run a bead of weld along the top of the intake tract. That gives you more materail to remove from the inside. Now you need to gasket match the intake to your heads. There are lots of articles online explaining that. If you still have stock heads, porting your intake will not improve performance, the stock heads are the bottle neck. To port the upper, cutting it in half is only way top do it right. That way you can access the ports inside the intake. Edelbrock is nice enough to make an access cover on thier intakes for this purpose. This is alot of work becase you need to be able to weld it back together. You have to make sure you removed the same amount of material from each intake tract otherwise is will not be balanced. You will also need to match up the upper and lower tracts perfectly and then make a new larger gasket. Or design the intake tracts to fit a truck/holley upper-to-lower gasket/spacer. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

08-09-2002, 05:41 PM	#6
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	eatsgmcar: He is talking about ported the stock intake manifold - not the heads. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

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08-09-2002, 03:48 PM	#4
eatsgmcar Registered Member Join Date: Jul 2002 Location: Pont Rouge, Quebec, Canada Posts: 45	Buy an old (used) E7TE head. Cut the head in straight line over the center of the intake and exhaust valves. You ll know exactly where and how thick you can remove the material. I did 12.723 @ 105.93 mph with stock ported head. Regards,

08-09-2002, 04:00 PM	#5
Fox Hound Registered Member Join Date: Nov 2001 Location: Bay Area, CA Posts: 58	Gee, this sound like more work then it is worth. I guess its probably easier just to get an aftermarket one. Thanks for the replies, though. If it was cheap and easy I guess everyone would be doing it, huh, and since everyone is buying an aftermarket intake there must be a reason for it...