Tapping from engine

[Ken Johnson <KR-Johnson@worldnet.att.net>]

Hi guys,
I'm sorry that all I ever do is ask you guys questions, but you are the
only ones I can go to.(Your'e still safe... I haven't been able to
answer anyone elses questions yet :)  My car sometimes makes a tapping
noise when I drive it.  The noise will occur when I first start the car,
and remain until the engine has warmed up (about halfway to school). 
Other times, the tapping noise will suddenly appear as I accelerate from
a stoplight.  What is it?  I thought it might be a valve(s) or cylinder
head.  If it is, can I bolt the 20v head onto my engine?  I own an 85
CGT.  Could I swap a used TQ5K engine for about the same price?
	Thank you for your comments.


Peter Johnson	(Need to convert my car to euro-specs.)