Hey y'all so ive been having trouble with my 73 southwind bbf460. So last weekend I was at lake Elsinore and I put my boat in the water and as I was idling around waiting for it to warm up. So once I got up to temp, I pressed the throttle to the floor and it maxed out at 2800 rpms  after driving around the lake for about 5-10 mins the temp shot way up, so I turned the motor off and I went to look at the motor and noticed that my left header completely melted my 5th,6th, and 7th spark plug wires. So I don't know if I melted the spark plug wires then tried to press the pedal to the floor.... And was running on 5 cylinders?? So that makes me think my left header is not even getting water to cool it down .
Mind you the weekend before I ran the boat all day and it ran perfectly, and the motor was just completely rebuilt
Thanks for yalls help in advance

It only maxes out at 2800 at wide open throttle?


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Hey y'all so ive been having trouble with my 73 southwind bbf460. So last weekend I was at lake Elsinore and I put my boat in the water and as I was idling around waiting for it to warm up. So once I got up to temp, I pressed the throttle to the floor and it maxed out at 2800 rpms  after driving around the lake for about 5-10 mins the temp shot way up, so I turned the motor off and I went to look at the motor and noticed that my left header completely melted my 5th,6th, and 7th spark plug wires. So I don't know if I melted the spark plug wires then tried to press the pedal to the floor.... And was running on 5 cylinders?? So that makes me think my left header is not even getting water to cool it down .
Mind you the weekend before I ran the boat all day and it ran perfectly, and the motor was just completely rebuilt
Thanks for yalls help in advance

I had the same problem before... some sand in the lines connected to headers and some sand in my t valve.. cleaned it and no problems since I check my t valve frequently was this on wedsnesday last week u were getting towed and got close to see if you guys needed help

I really appreciate all the help guys. Yeah it wasn't good. Yeah I'll go check the lines on it. Would I just un hook the jacket from the bottom of the headers? And plug the hose in and try to flush the system? Or take a air gun and spray it out?


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I disconnected the line from the headers and ran a water hose from the inlet of the t valve... it honestly the wires probably were out too long. Snug them closer away from headers

Pretty balsey 5 cylinder.

GT

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Hmmmm... 78hp @ 2800 is "Balsey?" or " BALLSIE"?

3.5L GM 5 is cyl 212hp

Notsomuch, just sayin'

Dan'l

Pinto motor would do that and more
Honda jet ski, well, double that...wtf

454, one bent exhaust pushrod (at 90*)  still at 5300 rpm...Milkshake...

D

GT-

All good

Dan'l