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i know a lot of people say go grade 8 but whats the thread and length size?
- Take your chances w/ removing the spacers and cut the bottommost brace on the factory manifold. Although initially intended to lend structural support to the manifold, it's been demonstrated that the brace also impairs the ability of the manifold to expand and contract front to rear causing subsequent manifold warpage, cracking or breaking of bolts. Even if using the factory spacers, cutting the brace has shown no deleterious effects and could be argued to be preventative insurance.