Port size adapters for GMC large port to small port manifolds. 228 to 302 or turned around, 302 to 228.
Port size adapters replace the alignment sleeves when mis- matched heads and manifolds are used. Example: a 302 head with an early 1950's aftermarket hot rod intake manifold made for a 248 or 270, or turned around, a 228 head with a late model large port intake manifold. Set of 3. Part #PSA228302.: $32.50
