sorting thru my spare pushrod tubes,i've found most have carbon caked inside--sprayed some oven cleaner in,and ran an old 12ga bore brush thru-- works nice!..upper c-case baffle and valve covers clean up well,too,rinsed in laundry sink..Tom "110-in-the-works" --------------------------------- Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish.