[Tigers] Advice req'd on engine noise - URGENT

[Pointers]

Appreciate the quick responses.
Answers consolidated:

Theo: Chromed steel covers
Kirk: Yes, hydraulic lifters
Tom:
- # miles on the engine unknown.
- No, not experienced to tune in the diff between rod & main vs wrist pin
knocks.
- Believe I had isolated it to either #2 or #3 cylinders, via long screw
driver to ear.
- Re: additives. The guy who brokered the sale of the car 15 yrs ago, swore by
Rislone Engine Treatment and suggested I run it through. I bought a litre at
that time. Still sitting in the garage, as it has run great until this. Maybe
I'll run it through.