TA Performance offers high quality original replacement and performance oil pick up tube assemblies. Recommended for most rebuilds. Many early small and big  block Buicks used 1/2” oil pick up tubes, this was barely adequate for stock engines. Even Buick engineers recognized this issue and went to 5/8” oil pick up tubes on `72 and later 455’s. TA highly recommends upgrading to 5/8” oil pick ups on most re-builds. Ask a TA Technician about this popular upgrade.