Inline Tube Compatible with 1967-69 Pontiac Firebird Full Size Car Long Branch Exhaust Manifold Bolts and Locks 15pc

1967-69 , , or HO & SD Long Branch Exhaust Manifold BoltsV8 EngineExhaust Manifold Bolt Set 15 pc. For Long Branch Manifolds These are for all V8 engine Long Branch exhaust manifolds,NOT the small manifolds. This bolt set has the exact head markings and lengthof the originals made to grade 8 specifications. Grade 8 is a hardened steel bolt which means when you go to take them out 10 years from now they come out instead of breaking off. If you are doing a concourse restoration this kit is a must. The originals are always rusted and pitted from getting hot and cold hundreds of times. The set also comes with the lock washers that were only used on the end bolts. The Locks goon the larger holes. If youlook the manifold not all the bolt holes are the same size - the larger holes get the locks.The locks are not on every hole. From the factory these manifolds would get very hot and expand and contract. The larger bolt holes required the locks because the bolts were not as tight as the rest so the manifold could expand with out cracking.