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Message: <blockquote data-quote="GDTrumbo" data-source="post: 495617" data-attributes="member: 10665">Since these guy's are "rebuilders" and not really hot rodders they do pay most of their attention to casting #'s no matter what it came out of. I talked to one of them last night and was told that they like the '96-'98 Teksid block best (because of the comp. ratio surely). I can do without the jackscrews on the main caps myself. They prefer the the Romeo '02-'04 head castings (for the latest beehive style springs and lack of the ladder type cam bore caps). As for the cams, they wear out the '03-'04 Mustang replacement part numbers. As I stated before, rebuilders have found that the hollow cams in the trucks engines will actually "wobble" or "wave' in their bores under heavy loads/uphill which can play with cam timing slightly, so they opt for the solid barreled cams. So saying that there were '01 PI heads in the Vic's is true. Even stll, the '99-'02 and '03-'04 cam part #'s, identification #'s and grind spec's do not match.  There were many cam profiles used in the 4.6L since the 4.6L sat on a rack in the R&D department at Jaguar when Ford bought them in '89. Yes, this is an engine with Jaguar origins. So if you count, there are 10 short blocks, including some FRPP parts, 9 heads including the FRPP (P/N M-6049-D46) head for '96-'98. Then there are the long block combinations. About 15 in all, as well as several OEM cam profiles.So novi281gt, I was wrong about the '99 PI Vic, but all PI's are definitly not created equal.GT</blockquote>