Just make sure you get the tstat in there right. There's a tiny lip in the housing you need to rest the thermostat on so it'll seal. Otherwise the stat will slide down and come between the part of the housing that meets the block and it'll cause a leak. How do I know? The dang thing slipped down there 3 times when I was changing mine out.
1991 F150 XLT Lariat - 300 I6/E4OD, 2 Wheel Drive, Bright Regatta Blue Metallic
Mods: True duals, 55w AUX reverse lights, Smoked tails/reflector, Smoked corners, 31x10.50s, 15x10s, Blacked out grille, Diamond plate bed rails, Tampa Bay Rays fuzzy dice, 2.5in level, 2in rear block, 6,000K HIDs, LED grille lights, Custom clear headlights