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37 pu exhaust/intake brass washers ?

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They go on the exhaust manifold at each end where it bolts to the block. There should be 4 and 4 special nuts that nestle in the tapered part. The nut can be replaced with stainless cap nuts by drilling through the ends of the caps. There should be 4 thick hard washers that clamp the intake to the exhausts manifold too.

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I think that those flex-locs are their substitutes for the rounded nuts used with the brass washers as the original nuts are not available ,that I know of. I would just drill out the cap nuts, use the round top nuts not pointed. I think that they are 3/8 nuts an they'll fit just fine. Be careful not to remove the threads.

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