Sorry about what happen to you man,but will never get over the fact that peoples leaves there belts on for over five years without changing them on their 944.This is beyond my understanding.Either you refresh that head completely or maybe buy a good use one, they are cheap and a dime a dozen for the 2.5.Also while in there may I suggest (if it not done yet) to upgrade your water pump with a new style one (turbo) if not done yet. You can get it has a kit with all parts need including thermostat,for your infos I've use Conti-Tech belts on my 83 for years & had nothing but success with them.Good luck
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83-944 show room -sold___New ride 93-968 with SC steering wheel-ROW signal ligths- Susp M030 mods lowered,Porsche VA springs- Adjustable struts - Bilstein inserts - Bilstein sport rear -LSD -riding on Cup 1 wheels 17x8 frt 17x9.5 rear road contact Falken 452/ 225-45 ZR Front 255-40 ZR Rear -- Motor Mods /chip /K&N / mod air boxe just love the handling & power