Heat causes the plastic to become brittle. The main problem is the inner chain guide on the drivers side. If the chain and guides flop around, the guide breaks and gets sandwitched between the chain and the sprocket. If this happens, the timing slips, the top of the cam cover breaks and the valves hit the pistons. Engine rebuild is next, a replacement engine or junk the car.

http://www.peachparts.com/shopforum/showthread.php?t=185820

It's not that hard but you do need some tools.

Checking is easy.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.