TR3/4 EXHAUST VALVES

[KENMUN@aol.com]

I'M TRYING TO BUILD A TR3 RACE MOTOR HEAD FROM 3 DONOR HEADS OF UNKNOWN 
ORIGIN. THE PROBLEM I'M HAVING IS THAT THE EXHAUST VALVES I WANT TO USE DON'T 
FIT 
INTO THE GUIDES IN THE HEAD I WANT TO USE. THE DIA. IS TOO LARGE. THE EXHAUST 
VALVES STEMS HAVE A SMALLER DIA AT THE TOP TRANSITIONING TO A LARGER DIA. 
TOWARDS THE HEAD OF THE VALVE. I'M ASSUMING THE CHEAPEST FIX IS NEW GUIDES. THE 
QUESTION IS WHAT GUIDES DO I NEED? THANKS, KEN M