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This listing is for a set of (8)Sealed Power Speed Pro Hypereutectic Flat top w/ 4 valve reliefs Pistons & matching Mahle or Hastings Moly Rings compatible replacements for 1968-85 350 Chevy. 350 BASED engine (4.000" bore x 3.480 Stroke). In your choice of Over sizes. Click on box for over size needed before placing in cart. Includes matching Perfect Circle Ring set!! Ring dimensions 5/64, 5/64, 3/16 Accommodates pressed or floating wrist pin installation. LOCK RINGS for floating pins ARE SOLD SEPERATELY and are not included with this set. LR63 SPEED PRO X 16