What is the compression limit of pump e85 on a sleeved k2.5 liter? Can I run 14:1- 15:1? I don't want to run any other type fuel.

Also, can somone recommend a IM for that high of compression. Head is 4Piston 163. I do not want ITBs.

Thanks

 

Ported and polished ultra race manifold, with plenum spacer. Anywhere from 14:1 -> 15:1 compression would likely work, I know that Luke/4Piston themselves say that 14.2:1 is ideal for these builds, I think Wiseco may actually have an off the shelf option for that.

Hope this is a race engine and you're running some monster cams on it.

 

Since you already have a 4Piston head you could get a ported ultra race manifold from them also.

 

kinsler intake manifold