OK, now I follow you, thanks for clarifying that. My understanding is that the 4 long side bolts hold the upper and lower together down to the heads, but I can leave the front 2 and rear 2 of the upper cover secured so that I don't need to separate the upper IMG again. Right? Then I have 4 more bolts front and rear which are holding only the lower housing to the heads? This is making sense now.

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'00 Rodeo LS 4x4; "K&N" cone filter; S/S Manik Front, Rear, & Nerf; 'Modest' sound system; 1.5" R'ooper lift, 265/70/16 Dunlop RVxt, Skyjacker Hydros, OEM LSD (sans G80 code)