521 Stroker Kit recommended by Carl

[1985 Ford F-150]

I dont think 4.5 inches is big enough to be woryin about that. A bone stock 400 has a 4 inch stroke.

 

[Truckin4life]

I think a 547 is more stroke then that, couldbe wrong as it has been along day...

 

[1985 Ford F-150]

Look at what charles posted it says external balace cranks come in 4.3 inches and 4.5 inches. So im assumin that the 547 is the 4.5 inch one. I could be wrong but thats how I understand it.

 

[1985 Ford F-150]

Here this is from a local company.
http://www.rpmmachine.com/scat-strokerkit-fordbb-460to545-500hp.html
4.5 inch stroke and 4.39 inch bore=545

 

[1985 Ford F-150]

Heres for a 557.
http://www.rpmmachine.com/scat-strokerkit-fordbb-460to557-750hp.html
4.5 inch stroke+ 4.44 inch bore=557

 

[Truckin4life]

Yup correct...

Do you see any factory gassers with anything bigger than a 4.0" stroke?
I am tryin to figure this out as well...
Im pretty sure that much more than 4" you run into a vac problem due to neccesary cams....
Im just thinking out loud here.

 

[1985 Ford F-150]

No cause its too expensive to make big cranks when they can just bore it out to get bigger displacement.