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  1. V

    log to center riser manifold?

    Im converting from log manifolds to center riser manifolds on a 1980 merc 260. 5.7l v-8, is it normal to get exhaust coming out of the riser water inlets when the hoses are not hooked up? Is it coming from where the water and exhaust mix at the outlet? Just curious if the riser gaskets are...
  2. V

    Orca or GLM?

    Im looking to buy new manifolds. Does anyone know which ones are better? Orca or GlM? thanks for all the help.
  3. V

    exhaust manifold question!

    i have a 1980 merc 260 5.7l v-8 with log manifolds and the riser that go straight down to the Y pipe. I want to do a thru hull exhaust conversion, and im wondering if the center riser manifolds with the straight back riser will work on my engine? it is a 350 chevy. thanks for any help.
  4. V

    feeling a little sluggish.

    Hi, I just purchased a 1980 Cobalt 19ft closed bow, w/mercruiser 260hp 5.7l V8. 4bbl carb. 19p stainless 3 blade prop. Engine runs great and has plenty of power. has trim tabs, with typical gear and two peoaple around 200lbs each, it runs 45mph on the speedo, between 4700 and 5000 rpms at WOT...
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