Hi all, I am Eric and I am a new member,

I have the same leaks using the C5447-40 Cometic gaskets. I am building a 528" Hemi with the 088515 4.500" bore World aluminum block and the Edelbrock Victor heads.

It is a 2018 block and has 2 steam holes per bank, near the sleeve at cylinders 1, 2, 7 and 8. I also have the FelPro 1104 gaskets and would drill them for the steam holes.
I think they will cure the leaks but they are 0.051" thick.

Anybody has infos about the Cometic C15620-040," Chrysler Gen-2 426 Hemi .040" MLS Cylinder Head Gasket, 4.500" Bore, World Products Block" ?

Regards,