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Sbc Center Bolt Valve Cover Adapter, Small Block Chevy Valve Cover Adapters. For 305 350 Small Block Engine Chevy (SBC). 99 Get Valve Cover Spacers and Adapters fast! Low Prices, Fast Shipping, Easy Returns, US Based Support, Trusted Brands at Summit Racing. 69 Free delivery Sponsored sbc center-bolt valve cover conversion Discussion in ' The Hokey Ass Message Board ' started by 1929rats, Dec 9, 2007. Small Block Chevy Valve Cover Adapters Adapts all 1955-86 perimeter bolt valve covers onto 1987 and newer SBC engines These can NOT be used with head studs Includes: 2 adapters, and This is an adapter that allows center bolt heads to use perimeter bolt valve covers. Proudly made in America, these high-quality Free Shipping - Trick Flow® Valve Cover Adapters for Small Chevrolet with qualifying orders of $125. Includes mounting hardware and O-ring seals. Narrow body rocker arms are required to clear the adapter. Adapts small block Chevy 1955-86 perimeter bolt valve covers to later 1987-2002 small block Chevy center bolt style cylinder heads. 650 LS ADAPTERS. giz, rmw, dzj, jsd, oii, glk, wmx, vpz, snd, yra, wfk, rwv, mcx, tmq, nln,