New 512 Stroker Running hot

[Orig69]

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I was going to use this and go for a drive then do it again. Almost finished sealing front of radiator. Bottom hose now has spring. New coolant and water wetter. I also think I’ve found my oil leak I’ve been trying to locate since first start. It’s the valley cover. But have you ever seen one that is beveled and wedges under the heads? How the f@&$ am I supposed to fix this?

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I have a dual plane intake manifold so I use the original valley pan.

Did you have to install the valley cover first before installing the cylinder heads?

 

[Geoff 2]

Elec fans slammed up against the rad core can act as baffles, inhibiting air flow.

 

[451Mopar]

This is a random question but since your build is almost exactly like what I'm working on right now, are you using anything special on the bottom end? I'm talking billet main caps, ARP main studs, girdle?

I'm doing the RB version of this build but with 240 heads and a Sniper EFI. Same cam specs, same cubes, same intake etc...

The machine work to fit billet main caps is really expensive, and I think over kill at 600 HP. Check what your machine shop charges to fit the main caps to the block.
Do use main studs. With the studs, the mains might need align honed, but that us way less expensive than align boring aftermarket caps.
The BCR stuff is nice. Have the caps and girdle on a stroked 400 block. Not sure if they still sell these: Caps and Girdle System
I haven't used a SpeedMaster girdle, but that say 3/8" thick, but you will have to source all the hardware: https://www.jegs.com/i/Speedmaster/746/PCE288.1018/10002/-1
The 440 512" stroker has a 440 Source girdle and hardware. 1/4 Main Girdle Setup
I think it used to be less expensive back when I bought it.
The girdles make fitting the 4.15" stroker molded windage tray / gasket clear the 4.25" stroker assembly easier. https://www.jegs.com/i/JEGS/555/502001/10002/-1?_br_psugg_q=mopar+windage+tray

 

[451Mopar]

On the cooling issue, with the automatic trans, run the hot trans fluid output through an external trans cooler before running it through the lower radiator core. don't make the lower radiator do all of / or the majority of cooling the trans fluid as it will make the engine pump inlet pull hotter radiator fluid into the engine.