Big block running hot. Can’t figure out the issue

[legopnuematic]

Adding to the discussion maybe it will help although I’m not well read on reg vs reverse rotation, but I have a Gen VI 454 bone stock in the 86. But it has old fashioned v belt system. Presuming the water pump was swapped for a v belt pump when the engine went in.
So do they cool the same reg or reverse rotation? I’d think so. IE it doesn’t matter which way you push the coolant through the engine.
But reverse cools the heads quicker (aka the 90s lt1 engines, early aluminum head 350s).
Not sure if this helps w your issue or just rambling.

The reverse rotation/standard rotation pump thing is just the impeller mirrored as the serpentine setup spins the pump the opposite direction that a v belt setup (or flat belt setup that uses the grooved side of the belt) does.

The flow path to and from the radiator remains the same for either pump setup.

Photo is of two ford pumps (their open design makes it a good visual) one std and one rev rotation:

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[nvrenuf]

I'm glad the radiator turned out to be a big one, that should cool fine.

For the record, the 049 and 781 heads are basically the same casting so (if they are good) swapping between the 2 castings wouldn't make any difference.

 

[Slooptin]

I'm glad the radiator turned out to be a big one, that should cool fine.

For the record, the 049 and 781 heads are basically the same casting so (if they are good) swapping between the 2 castings wouldn't make any difference.

Sorry, meant 045 heads. I have another set of 049 cores sitting in my garage waiting to get some love.