I just rebuilt my 454 blower motor and changed my EMI to Lighting headers. I blew up the last one due to what I think was reversion. I am not sure what all I have in this motor regards to cam size. Has anyone ran a T off the thermostat housing to the headers and one for a dump with a ball valve to combat reversion. If so what do I need to know when doing this. Thank you in advance....

Well I am no motor head but what I have read due to the cam and your lob on the exhaust side does not close in time and sucks water back through your exhaust. I heard if you run less water through the exhaust it will lessen the chance of reversion if you have the wrong cam. I seen one boat in the performance boat magazine that had a jet with a T set up coming off the thermostat housing. If this is a stupid questions I am just trying to get info to save my butt so my wife doesn't get pissed because we're not on the water... Cheers ....

Are you saying that there isn't a T at the thermostat? And all of your engines "puke" water is being delivered to your headers?


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I was just asking if there was a split, or if all of the exiting water was going straight to the headers, which is wrong, no matter what header system is installed..... I'm sure it's common knowledge that one exit should go straight to the piss hole and the other to the headers...... Otherwise, from what I got from the original post, it sounds like there is only one water exit at the top and it is going straight to the headers, in which all of the water pressure to the motor is the same pressure to the headers that would cause way too much water to the headers and would cause reversion.... I may have read it wrong but there shouldn't be any water to the headers under 2500-3000 rpm..... If it is going directly there, it would cause a big problem


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I was just asking if there was a split, or if all of the exiting water was going straight to the headers, which is wrong, no matter what header system is installed..... I'm sure it's common knowledge that one exit should go straight to the piss hole and the other to the headers...... Otherwise, from what I got from the original post, it sounds like there is only one water exit at the top and it is going straight to the headers, in which all of the water pressure to the motor is the same pressure to the headers that would cause way too much water to the headers and would cause reversion.... I may have read it wrong but there shouldn't be any water to the headers under 2500-3000 rpm..... If it is going directly there, it would cause a big problem


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These are through transom jacketed headers.... If you shut the water off to them, the boat sinks... You need to get out more...

ECM has referred to OT headers three times in the same thread, I was just clarifying that these were eldifferento... 

Learning spanglish as a second language... Howd' I do?

GT

Hello, I want to offer my two cents' worth.  I have seen a lot of cooling system setups, and most often people overlook the volume and pressure that a jet pump is capable of.  If the cooling system is not plumbed properly, it leads to all sorts of problems.  I know with my own outfit, I run a thermostat, and I regulate my cooling water to be no more than 20 P.S.I.  Also, I regulate the water going into the headers, so that there is barely any visible steam.  This works, and has been working for 20 years.  Another important thing to remember is that when you shut off, there should be no water in the exhaust system. How you achieve this, is up to you, but it will work, and regulate the engine temperatures properly, without fluctuating up and down, or getting water into the engine itself. I hope this helps.