Product DetailsSierra 18-8532 marine exhaust manifold mounting kit. Used with: 18-1957-1 manifold, For: Mercruiser GM Big Block V-8 454 cu. in. (models 330, 340 & 7.4L). Replaces: GLM 33765, Mallory 9-40575, Osco 9011-MK.
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.