I have a 528 Hemi with Stage V aluminum heads and I think that the fan/radiator set up is the key to keep these siamese blocks cool. I ran a fixed fan with a shroud and an aluminum radiator; no problem whatsover on the road. But once I got in traffic it climbed very quickly and I changed over to 2 electric fans and it helped the in town driving considerably.

QuickD100 and I bought our bare blocks from JEGS.

Last edited by Hemi_Ram; 12/28/08 12:40 PM.