4.165" Bore 5/64"-3/16" Moly standard fit piston rings.

Speed Pro Rings-4.165" Bore 5/64"-3/16" Moly standard fit piston rings

Speed Pro Piston rings dominate the racing industry with technically advanced design; dedicated research; and superior quality. Speed Pro rings deliver superior performance under grueling race conditions every weekend; on oval tracks; and drag strips world wide.

•         Fits 377/400 
•          Ring Configuration 5/64”; 3/16”
•         Available in Std; 30; 40; 60 bore sizes