More information on the Solvent to free the Exhaust Heat Control Valve. The description on the MOPAR 8 oz.can that I have is: "Mopar - Heat Control Valve Solvent Penetrating Fluid. Part No. 4-187: Part No. 3419 128. dated 1972. Contains aromatic petroleum distillates, butyl cellosolve and colloidal graphite. The can says: Distributed by Chrysler Corp." "A specially formulated to dissolve lead-oxide deposit formation on manifold valve shaft, allowing heat control valve to operate freely at all times. An excellent rust penetrant." A person should be able to find this product at a parts house under another brand. John & Arlys Chesnutt, Portland, OR 1957 300C and 1970 300 Convertible ------------------------ Yahoo! Groups Sponsor --------------------~--> You can search right from your browser? It's easy and it's free. See how. http://us.click.yahoo.com/_7bhrC/NGxNAA/yQLSAA/8LmulB/TM --------------------------------------------------------------------~-> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/