Hi everyone,

I’m going to put a Weiand 144 blower on a 272 y block and I’m just trying to work out correct estimated boost. I have used the formula on Weiand’s tech pages (see pic below) but I’m unsure what the 25.58 factor relates to. If anyone could help me out with a formula that would be great. Any other recommendations/experience blower related would also be welcomed.(I have had a search and found nothing specific)

The engine will be just a cruiser, nothing too serious. The project is happening, I just need to figure out how far I will dig into the engine. I am hoping to run a low PSI to keep the engine close to stock and comp down below 12:1.

Here is a list of things that I have planned/thinking about.

- new 1.54 rocker assembly + stiffer springs (still not sure how stiff)
- stock grooved cam or custom grind favoring exhaust (although I have read custom grinds have marginal gains over stock cams <5000 rpm.
- ecz-c heads or G not sure yet.
- head studs
- forged pistons

And all the usual little y block rebuild mods and all bearings changed out, also I have the manifold sorted out too.

I have probably missed some things but oh well.




Thanks, Dennis.

56 F100 - 272 Y Block
NSW, Australia.