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FE Technical Forum / Re: 1970 f250 390 build
« on: May 12, 2024, 07:20:14 AM »
Keep in mind, header flanges are different for aftermarket heads and the truck iron.
Some can be drilled or slotted to allow the gasket and port to be aligned and seal, some cannot. I have a stroker in my own truck and I decided to port the iron. Nowhere near the performance of TFS, but my headers were ceramic coated and fit well. 490HP @5000 with an almost too mild hydraulic flat tappet, would be deep into the 500s with the TFS
If you have the headers already, buy a pair of gaskets for a CJ car and see if there is room to mover the bolt holes around. Unfortunately, I do not think anyone makes the correct header if it's a 4x4 anymore, FPA used to but stopped making 4x4 headers
Some can be drilled or slotted to allow the gasket and port to be aligned and seal, some cannot. I have a stroker in my own truck and I decided to port the iron. Nowhere near the performance of TFS, but my headers were ceramic coated and fit well. 490HP @5000 with an almost too mild hydraulic flat tappet, would be deep into the 500s with the TFS
If you have the headers already, buy a pair of gaskets for a CJ car and see if there is room to mover the bolt holes around. Unfortunately, I do not think anyone makes the correct header if it's a 4x4 anymore, FPA used to but stopped making 4x4 headers