Quote:

---

I talked to them about 15 years ago, considering the conversion also, but is was expensive I think over $5K, and I thought you had to drill and tap the head bolt holes for 1/2" bolts? I also think they required external oil return lines to the oil pan?

---

A buddy of mine has a set of the Stage V conversion heads installed on a (get this) 440 that was sleeved back down to a 426.
It was built back in the early 90's.

Yes there are external oil drain back on the corners of the cylinder heads.
I don't think the head bolt size was increased, but I could be wrong.
The ones that are usually studs at the top use allen bolts through the intake port with a plug from the top if I remember right.

He's the king of "different" combination's.

His 16 plug Hemi Dart used to run a de-stroke crank that made it 396ci. After blowing up the Frankenstein motor enough he finally built it to a 472ci.