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Old 04-23-2015, 12:48 PM   #1
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Default Manifolds and Risers

Thanks again Mike. Just realized all my misspelled words in post. It was late. I understand. Sad part is, I don't have a history on boat before last owner. Even then, I don't have much from him. My assumption is that he never replaced manifolds or risers. The boat was owned by someone in Huntington Beach California, so assuming salt water use. Need to move ahead and replace all. Out of curiosity, when riser is running hot, any way of knowing if failure is riser or manifold? Also, assuming nothing has ever been changed and both running lower than 150, is that a reliable indicator of proper function? And can you measure temps out of water running engine with water muffs? I assume that you would have to run at full throttle?
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Old 04-23-2015, 02:20 PM   #2
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Just in process of pulling the riser. Mine have the cast spacer. Trying to lift riser of above bolts but, can't manipulate over bolts while riser attached/connected to rubber sleeve. What's the best way to get that sleeve slid back so that I can get riser above top of bolts and remove? Can't pull riser out toward me because of bolts. Make sense?
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Old 04-23-2015, 04:05 PM   #3
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Ok for correctness a lot of folks call the elbow a riser but the riser is really that spacer you mentioned.

Elbow typically fails before the manifold, cracks form where the raw water is injected into the exhaust stream.

Never run the engine much above idle on muffs, may not be enough water flow to cool. Also the water hose may collapse from the pumps suction if a cheap hose.

To remove your set up loosen the other end of the rubber hose where it connects to the Y-pipe, this will also allow you to inspect the flappers which probably need to be replaced.

What engine and drive do you have?
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Old 04-23-2015, 04:39 PM   #4
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5.0 alpha gen 2
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Old 04-23-2015, 04:48 PM   #5
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And after loosening clamp on hose connecting to y pipe, I would just pull that whole pipe out along with the elbow, leaving it all connected?
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Old 04-23-2015, 07:55 PM   #6
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Quote:
Originally Posted by lifespan View Post
And after loosening clamp on hose connecting to y pipe, I would just pull that whole pipe out along with the elbow, leaving it all connected?

exhaust.JPG

You want to remove item 1 - 3 with the elbow

Loosen the lower clamps then use a flat blade screw driver to break the seal between the hose and y-pipe
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Old 04-24-2015, 01:52 AM   #7
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Pulled the elbows today and wow! Completely closed off with rust, flaking everywhere. Jacket was really bad. The one that was running hotter was worst. The other, although seemingly running normal temp, was really bad as well. Not sure how to post pictures here, but would love to do that if someone knows how.

In the market now for the entire kit. Any best resources, with best prices for manifolds, elbows, risers and all gaskets?
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Old 04-24-2015, 02:19 AM   #8
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I haven't ordered mine yet, but while looking around, go2marine.com seems to have good prices. I am going to go with aftermarket ones.
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Old 04-24-2015, 02:22 AM   #9
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Thank you. I did see them. I would imagine that providing them the engine serial number would make sure I get order exactly right?
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Old 04-24-2015, 12:06 PM   #10
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The 5.0l and the 5.7l take the same headers/risers/elbows throughout their history (with a few minor exceptions). I haven't seen one whole kit that has everything, so you'll have to order the manifolds, spacers, risers separately. Just as long as they all say for small block Chevy or 5.0l or 5.7l.
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