This is my first post so here goes!! Bought a 98 f150 4x4 with the w vin Romeo 4.6 for $850. Engine was out owner bought it with a blown engine thinking he would fix it one day and then I buy it. Sold it to me with an engine to go in it so I got it running and drive it about a month before the oil pressure dropped. Went to pull a part and got another 4.6 out of 94 town car put it in and it sounded great but smoked like crazy because the valve guide seals were shot. Read online about power improvement head swaps and ended up doing the swap. Drove truck to TN and burnt #8 intake valve because I didnt have time for a tune yet. Got head warrantied out but now I have a horrible tapping noise when warm on the right bank so I checked oil pressure and it's no good 12 to 10 psi hot in gear at idle at the sending unit tap, 0 psi on the tap at head on right bank. So my question is has anyone had success rebuilding a 4.6 or had any success having one rebuilt by a machine shop? I'm on a tight budget now because of what else I have done to the truck.