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Volvo 5.7 Penta Exhuast Manifold Rear Drain Reduction Sleeve & Plug

evh5150

New member
Purchased my boat last year and the previous owner walked me through his winterization process. He said to remove the reduction sleeve off the back end of the manifold to allow for drainage. In doing that, the brass head of the bolt has rounded a bit because it's a pain to get in there with the wrench. Can these be replaced with stainless so they aren't so soft? Is there an easier way to remove/install them?
 
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