If the only problem is the nuts loosening, try Stage8 fasteners. What is the manifold collector stud size? 3/8 bolt x 16 thread? Anyway, Stage8 sold me the nuts with their clip on piece that will hit the pipe before allowing the nut to back off the studs in my Rams Horn manifolds.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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