Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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did you check the manifold itself for warp page ?
take it out and lay it on flat table and see or send it to machine shop for them to check ?
you should be sealing , if you replaced the bolts & gasket and torqued them
you might have to replace teh exhaust manifold itself
Please let me know
ASE Certified Technician