BB Chevy Complete Engine Bolt Set - Professional Products now offers premium quality stainless steel bolt kits featuring 12 -point bolt heads. Kits are available for complete engine conversions or for just intake manifolds. The heads of all 12 -point bolts are polished. The various bolts in each kit are grouped together and labeled as to size and length plus the specific application is given, such as intake manifold, pan, alternator, water pump, distributor, headers, timing cover, fuel pump, valve covers, etc.