[DeTomaso] modified port plates for 180's

[mark skwarek]

Thanks for your comments. 
 
Fortunately I have a miller and like to play around a bit. 
 
I agree Ken that it would be much easier to use Aluminum heads but iron is what I have at the moment. 
 
Will, I'm working on the intake side also. Yes the exhaust is under some pressure but the lower the pressure the better scavenging you should have.  
 
Goran, If you come across with another picture, I would like to see it. 
 
Right now this is a mental exercise for me. I may or may not do it. It would look unique. The first thing I would do is to mockup a cylinder and do some flow testing to see if there might be some benefits. 
 
Mark

--- On Mon, 1/5/09, Göran Malmberg <hemipanter at hemipanter.se> wrote:

From: Göran Malmberg <hemipanter at hemipanter.se>
Subject: Re: modified port plates for 180's
To: "Ken Green" <kenn_green at yahoo.com>, detomaso at realbig.com, ehpantera at yahoo.com
Cc: jderyke at aol.com, "Daniel C Jones" <daniel.c.jones2 at gmail.com>
Date: Monday, January 5, 2009, 2:57 AM





You do not see it on the image but my old 302 with 4V heads was modified to 
what was called "high port heads". This means cutted away the entire exhaust 
port casting outside the valve covers.And replace it with a massive aluminium 
bar having new exhaust ports grinded that raised the port by over an inch. 
Making for a very nice 180 header design.
www.hemipanter.se klick exhaust.
Goran

----- Original Message ----- 
From: Ken Green 
To: detomaso at realbig.com ; ehpantera at yahoo.com 
Cc: jderyke at aol.com ; Daniel C Jones ; Göran Malmberg 
Sent: Monday, January 05, 2009 6:19 AM
Subject: Re: modified port plates for 180's






I think people have said that the Cleveland exhaust ports were designed with sharp bends to fit the Mustang shock towers.  
 
I think all the aluminum SVO heads (A3 to the latest Nascar heads) have a smoother turn.  It would seem a lot easier, and maybe cheaper, to just use one of the SVO heads and get all the other benefits than start modifying 4V heads.  Of course, you also need a different intake manifold for the raised intake ports.
 
Ken

--- On Sun, 1/4/09, mark skwarek <ehpantera at yahoo.com> wrote:

From: mark skwarek <ehpantera at yahoo.com>
Subject: modified port plates for 180's
To: detomaso at realbig.com
Cc: "Ken Green" <kenn_green at yahoo.com>, jderyke at aol.com, "Daniel C Jones" <daniel.c.jones2 at gmail.com>, "Göran Malmberg" <hemipanter at hemipanter.se>
Date: Sunday, January 4, 2009, 8:21 PM







I am interested if comments regarding the use of port plates to modify the exhaust port so that it does not make a 90 degree turn  exiting the head perpendicular to the cylinder bore, but rather making a shallower turn which results in the port comming out the top of the head adjacent to the valve cover.  The head would be wider than stock but not as wide as when you add the width of the frist header bend. We try to make the intake as straight as possible but I haven't seen anything about making the exhaust as straight as possible.
 
Is there anything to be gained?  If so what and how much?
 
 This should work well with 180 degree headers. 
Mark