This may seem redundant. You might even think their are no differences when it comes to pi intake gaskets.
At the place i work, we produce every ford pi intake manifold ever made and we still to this day produce it. One challenging aspect of this particular product and its special way of being made is the allowable amount of warpage from set datum points, such as from the intake flange front to the rear. Their can be warpage,but only so much. To reduce the tight allowable tolerances, thicker intake gaskets were used....kind of makes sence, right?
Fel-pro produced the original gaskets and they produce the aftermarket replacement as well. All the other brands produce gaskets but are not to ford spec. Gasket thickness is the major concern here.
![20220218_065216.jpg 20220218_065216.jpg](https://www.sn95forums.com/data/attachments/15/15211-bcbd5dfb27886a594051362a354554c0.jpg)
![20220218_065352.jpg 20220218_065352.jpg](https://www.sn95forums.com/data/attachments/15/15212-8738093511997454c2c6790c45b0efe4.jpg)
What you see is a felpro at the top and a cheap rockauto at the bottom. Both pi intake approved intake gaskets but only one meeting ford specs for a 4.6l intake manifold.
Ford came to us stating leak problems with returned intakes. What we found and basically already knew was the thinner gaskets would leak. So we purchased multiple brands besides felpro to debunk with our leak test process and this is what was found.
At the place i work, we produce every ford pi intake manifold ever made and we still to this day produce it. One challenging aspect of this particular product and its special way of being made is the allowable amount of warpage from set datum points, such as from the intake flange front to the rear. Their can be warpage,but only so much. To reduce the tight allowable tolerances, thicker intake gaskets were used....kind of makes sence, right?
Fel-pro produced the original gaskets and they produce the aftermarket replacement as well. All the other brands produce gaskets but are not to ford spec. Gasket thickness is the major concern here.
![20220218_065216.jpg 20220218_065216.jpg](https://www.sn95forums.com/data/attachments/15/15211-bcbd5dfb27886a594051362a354554c0.jpg)
![20220218_065352.jpg 20220218_065352.jpg](https://www.sn95forums.com/data/attachments/15/15212-8738093511997454c2c6790c45b0efe4.jpg)
What you see is a felpro at the top and a cheap rockauto at the bottom. Both pi intake approved intake gaskets but only one meeting ford specs for a 4.6l intake manifold.
Ford came to us stating leak problems with returned intakes. What we found and basically already knew was the thinner gaskets would leak. So we purchased multiple brands besides felpro to debunk with our leak test process and this is what was found.