HEI in Mopar ECU casing

mopower440 said

I'm not attaching the heatsink and module to the mopar box. I am attaching the aluminum heatsink with the module to the firewall, then the hollowed out mopar box just bolts over it to cover it. now im trying to think of how to attach the aluminum heatsink to the firewall without drilling holes in the firewall. Thought about just jb welding the heatsink to the firewall but then my idea of using thermal paste between the heatsink and firewall can't happen..

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I understand the current plan, but let me run something by you.
If you have a heatsink for the ECU you don't have to mount the ECU to the firewall.
You can leave the ECU and heatsink floating so to speak. (as long as you have a ground wire for the ECU it does not have to be mounted to metal.)
You could also use the firewall as a heatsink and ground and mount the ECU with the thermal compound between them.

Just some possibilities that I didn't know if you had thought of yet.