Im running -6 an on both rear sides to a Y connector and dumping a single -6 over board on both engines.

I would agree independently to avoid any transfer. I was trying to eliminate the amount of dumps however as Rookie mentioned utilizing the exhaust and that actually may serve two purposes (possibly). Just thinking the exhaust might help pull or suck the water through.

Im probably over thinking but better than under I guess. Lol

Thanks for all the help Jason. I realize every platform will alter and have to adjust accordingly however that’s a good baseline to start. I remember seeing those restricters you posted. Pretty slick and easily adjustable or replaceable.

One thing I’m curious of is what your doing for a t-stat if any. I would assume you are and drilled holes but your advice on that would be helpful. I’m really curious as the size stricter you used for the bypass. Header temps ok prior to stat opening? Again that’s if your using them.

Again thanks for your time and help. I really enjoy experimenting and ongoing look for ways to improve however that’s a great place to start and save me some time. Plus good info for others.

That must have been some chitty days when the valves said good by. Dammm.

More non closed cooling related. Not sure if there’s any improvements to make on closed cooling. Probably though.

Jason did you have any comparison from std firing order vs the 4/7-2/3 swap. That would be real interesting to know also.

Personally I don't like more water in the exhaust then needed, your concerns of more penetrations in the hull is valid.. I use wafers in place of the t-stat settled on the 3/4 hole and dumps off the rear intake and seems to work for my application.. all engines and exhaust systems will react differently. you will fine tune it once it's in the water and running.

Thanks and yes I’m finally on the way to getting in the water. Long project. Business put most on hold. I have dry Stellings to the tip so I’ll have to check that out but certain I will have options. Btw I still need to get john sr on your boat. He’s 80 now even though one would never know it however I wanna get him on the water over 100 mph. 😎

I have 2 -6AN lines coming off my intake.
Thats how it`s always been .
I grab water temp back there too.
I don`t know what it helps or doesn`t lol


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I ran 140°F stats with 4-3/16" holes. This would allow the blocks to generate a little heat. ~110°F while idling. On long runs they would get to 140°F but one block would slowly climb into the 160° (old stats) so I put another hole in it. It's funny that this thread came up. I am now going with 120°F high flow race thermostats.They appear to be able to flow some water. I was just installing them tonight.


No, I have never ran a comparison. Valako and I talked with his Comp Cam tech guy and he said the biggest benefit to the swapped firing order was the cooling aspects and minor HP gain.
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Getrdun - if you use tstats you’ll have to get tstat spacer with that intake or mill the divider i guess