Any reason these wouldn't work on an S4 block? Part number 800-420
https://dartonsleeves.com/mid_06.html

 

isnt that what mike simard used for his 7 liter build

 

Mike and Twin Turbo Todd both built 7 liters with steel sleeves. Darton doesn't make a sleeve big enough so Mike and Todd built their own.

Mike's motor - Post #8 talks about the sleeves:
https://rennlist.com/forums/928-foru...ject-pics.html

Todd actually built a 7 and 5.5 liter using two different style sleeves of his own design, he made himself:
https://rennlist.com/forums/928-foru...the-works.html