Join Date: Mar 2003
Location: Was in CA... now in Goodyear, AZ
Definitely don't want to install the engine with the headers on. They will go in from the top with no problem. The driver side is a piece of cake. On the pass side, you will have to deal with the A/C lines and tweek the engine oil dipstick tube. Also on the pass side, the rear most flange bolt is a PITA if you use a regular header bolt (an issue on all headers). So use an allen capscrew and an allen socket on a short extention. Some have had clearance issues with the frame on the pass side also, but nothing a BFH doesn't fix. And check for welding slag around the bolt holes and grind it off where necessary. For that reason, I would do uncoated headers and make sure they fit first and then have them coated after. You will have to address plug wire clearance on both sides, which would be easier on the engine stand.
And FWIW, headers are absolutly a performance gain!
96 BBB, sewer pipe, TB bypass, BH OBDI, eaton w/4.10s, CPT Level 3, Edge 3000.