The first time i flexed after the BL, i broke one of the plastic heater core nipples on the firewall. Luckily there was enough plastic to reattach w/ a new hose clamp.

to prevent this from happening you can just unsnap the plastic hose keeper clamp thing at the back of the engine. it will give your hoses the slack they need. i just wish i would have noticed it before.

let me know if you need a picture.