Results - modified PI intake on NPI heads

91LX2Bfast · 11-19-2003, 07:49 PM

You guys have to check out the link.
KD took a PI intake, and reshaped the ports to fit the NPI ports on the head.
In his words from the link: "As for the process of how to make one of your own, see the other thread for the most part, just get some NPI gaskets, overlay them on the PI intake, scribe the outline of the NPI port size, wherever the line drops into the port makes the boundary of where the epoxy needs to go, then rough up the inside area, mix up and pour in your epoxy and let it set up good before trying to shape it with the die grinder. You'll probably have to do multiple pours in each port, in order to get it all in the right places you have to position the intake different ways to keep it from running down into the port or just running out of it. Also, I did put 2 sheet metal screws in each port from the backside so the threads were protruding out into the port where the expoxy needed to go. This gave the epoxy that much more to hold on to, and hopefully it will never come out. The screws were longer than needed and were just ground down while shaping the epoxy. This isn't a very difficult project, it just takes some time to do."
On page 2 of the link, there is a picture that shows the difference in the port cross-section size between a NPI and PI intake. Observe how much larger the PI runners are.
96_4.6 - when we were talking about your C&L upper, this is what I was trying to tell you about, the size difference between the PI and NPI intake ports.

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11-19-2003, 07:49 PM	#8
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	You guys have to check out the link. KD took a PI intake, and reshaped the ports to fit the NPI ports on the head. In his words from the link: "As for the process of how to make one of your own, see the other thread for the most part, just get some NPI gaskets, overlay them on the PI intake, scribe the outline of the NPI port size, wherever the line drops into the port makes the boundary of where the epoxy needs to go, then rough up the inside area, mix up and pour in your epoxy and let it set up good before trying to shape it with the die grinder. You'll probably have to do multiple pours in each port, in order to get it all in the right places you have to position the intake different ways to keep it from running down into the port or just running out of it. Also, I did put 2 sheet metal screws in each port from the backside so the threads were protruding out into the port where the expoxy needed to go. This gave the epoxy that much more to hold on to, and hopefully it will never come out. The screws were longer than needed and were just ground down while shaping the epoxy. This isn't a very difficult project, it just takes some time to do." On page 2 of the link, there is a picture that shows the difference in the port cross-section size between a NPI and PI intake. Observe how much larger the PI runners are. 96_4.6 - when we were talking about your C&L upper, this is what I was trying to tell you about, the size difference between the PI and NPI intake ports.