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		| tunnelport engine | 
	 
		| By John - 03/06/2001 2:55:07 AM; IP 63.161.101.137 | 
	 
		|  I purchased a tunnelport engine that has not been run since complete overhaul  10 years ago.  It has the sodium exhaust valves, should I replace them with SS valves?  Also at what RPM will these heads out perform the medium riser heads? What can I expect to gain by installing a 428 crank in this engine?  What are the downfalls?  I was also told to replace the rockerarm assembly with Dove roller rocker arm assembly, what do you think?   Thanks for imput.  | 
	 
 
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