It may be plastic but if it gets stuck under a valve and get mashed it could cause damage to the valve job, it is worse than carbon and carbon can burn valves if its under the seat and valve. just my opinion, if it was mine(and its not) I would get it out before you try and turn over. Dan

http://s1055.photobucket.com/user/baldybenny/library/

1936 1.5 wrecker,1937 gmc coe,1939 Chevrolet coe,1942 4x4 coe, 1942 coe,1946 dump,1947 2 ton dump,another 1947 2 ton dump,1950 coe,1967 c30,1937 cat 22,1936 Chevrolet 5 window foremans coupe, 1914 ford speedster.