Exhaust port question
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New User
Joined: Feb 2006
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Exhaust port question
I am having a set of heads for a 429/460 port and polished. The feller that is doing it has come across a way of increasing the flow on the exhaust port side of the head. He put putty in the bottom of the port hole. He was telling me a of a product that you can put in the heads before installing the headers that will act like the putting and take up the space in the bottom of the port hole. He was thinking the name was Powerplates, but thats not it that is a product for the carb. He was pretty sure it was made by MPH but not sure of that. The way he talks it is like a brass or steel insert type thing. Has anyone heard of this or know where i can get them? If not I will have to the holes welded up at the bottom and i don't really want to have to do that.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
he is talking about port plates and I have never heard of anyone putting them on the exhaust side, I have only seen them used on the intake side and almost always on 351c 4v motors. basic premise is to raise the affective port shape, but I don't know that I would do this on the exhaust ports on a 460 head. I would have to see actual flow numbers with and without that done on the same port to believe it increased the flow on an exhaust port.
Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
I think he is just trying to fill in the base of the exhaust port not raise the top of the port or that's how I read the post. Not sure what one could use on the head for that and not have it come off but I am sure that if there is such a thing a speed shop would know about it.
As for port plates the Cleveland motors did get plates on the exhaust side. The head would have to be milled and a set of plates would then be bolted to the exhaust side of the head where this milled section is and this would raise the exhaust port exit by a large amount. I have not seen a set of heads done like this in a very long time. It's a very old trick and with todays heads people just don't do that kind of work any more and I have never seen it done on a 460 head.
As for port plates the Cleveland motors did get plates on the exhaust side. The head would have to be milled and a set of plates would then be bolted to the exhaust side of the head where this milled section is and this would raise the exhaust port exit by a large amount. I have not seen a set of heads done like this in a very long time. It's a very old trick and with todays heads people just don't do that kind of work any more and I have never seen it done on a 460 head.
Elder User
Joined: Jul 1999
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From: Missouri
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
RTM I know about those port plates on the exhaust side of the clevelands and the purpose was the same to raise the exhaust port for a straighter port but I am probably using the wrong term they use a port filler plate on the 4v heads that are epoxied into the port and the intake.
FTE *******
Joined: Jan 2004
Posts: 791
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From: Pittsburgh, PA
I have set of those MPG heads port plates. They work nice......Im done with them...on to A-heads a few years back. The port plates help liven up DOVE heads on the top end, I was pushing 6600-6900 RPM out of a DOVE headed 500 with them a few years back. It was a mild pump gas motor that made about 550hp with a MPG-heads/Cam Research Corp (Scott Main) solid flat cam.
