496 Mag - 360 hrs - time for manifolds?
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496 Mag - 360 hrs - time for manifolds?
Hey All
My Cobalt 255 has 5 seasons and 360 hours on it. The last 3 seasons running in the salt.
At this stage, is it even worth having the manifolds and heat exchanger boiled and inspected or do you just replace the parts now?
Is it worth buying OEM or is this a legitimate opportunity to buy on a reliable after market product that ups the HP without sacrificing reliability or fuel consumption too much?
thanks in advance for the opinions.
My Cobalt 255 has 5 seasons and 360 hours on it. The last 3 seasons running in the salt.
At this stage, is it even worth having the manifolds and heat exchanger boiled and inspected or do you just replace the parts now?
Is it worth buying OEM or is this a legitimate opportunity to buy on a reliable after market product that ups the HP without sacrificing reliability or fuel consumption too much?
thanks in advance for the opinions.
#4
We sell the heat exchangers (USA only) and manifolds (both Chinese and American made) for that engine if you need help with new. But Dave M is right...pop off the risers and take a look. If the manifolds look good you're probably ok. The heat exchangers are harder to evaluate. If 4 years old in BC, you can probably clean, properly test both circuits and be fine. Just know you're going to release crud into your glycol circut...no real way to stop it.
If you were in South FL, I'd have a different opinion. But up there....prob ok.
If you were in South FL, I'd have a different opinion. But up there....prob ok.
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Mr Cool for all of your heat exchangers and oil coolers , transmission coolers and more!
Locations in: Florida, Michigan & Washington!
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Hey All
My Cobalt 255 has 5 seasons and 360 hours on it. The last 3 seasons running in the salt.
At this stage, is it even worth having the manifolds and heat exchanger boiled and inspected or do you just replace the parts now?
Is it worth buying OEM or is this a legitimate opportunity to buy on a reliable after market product that ups the HP without sacrificing reliability or fuel consumption too much?
thanks in advance for the opinions.
My Cobalt 255 has 5 seasons and 360 hours on it. The last 3 seasons running in the salt.
At this stage, is it even worth having the manifolds and heat exchanger boiled and inspected or do you just replace the parts now?
Is it worth buying OEM or is this a legitimate opportunity to buy on a reliable after market product that ups the HP without sacrificing reliability or fuel consumption too much?
thanks in advance for the opinions.
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The early model 496 engine from Mercruiser years 2000thru 2004 had aluminum base manifolds and in salt water use they will corrode thru faster than the new iron units that Mercruiser has been using on the 2004-1/2 thru current 496 year engines. There are usually quite a few late low hour used sites here on OSO and on ebay for sale that can be purchased for a lot less than new from Mercury. I would recommend using the newer iron manifolds as they will last longer in salt water and you should also consider a flush fitting on the engines to make sure you are flushing the entire system after use with fresh water to slow down the salt buildup and corrosion that occurs in all salt water exhaust systems.
Best Regards,
Ray @ Raylar
Best Regards,
Ray @ Raylar
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thanks everybody
I thought (was hoping) you would all be more insistent to use this opportunity to add some performance (its easier to convince the wife if i am replacing something that needs replacing!) manifolds. From what i read, the manifolds are the least expensive way to add a little HP. I figured if i have to replace them anyway... : )
Does the serial number of the motor confirm its mfg date?
Its a 2005 Cobalt 255, but maybe the motor was built in 2004?
I thought (was hoping) you would all be more insistent to use this opportunity to add some performance (its easier to convince the wife if i am replacing something that needs replacing!) manifolds. From what i read, the manifolds are the least expensive way to add a little HP. I figured if i have to replace them anyway... : )
Does the serial number of the motor confirm its mfg date?
Its a 2005 Cobalt 255, but maybe the motor was built in 2004?
#10
Point taken, i hadnt heard of issues. I have several friends that have used the small block sets with no problems. Thanks for the info, I'll hafta look into it further.
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )