Safe max HP for a stock frame

[Canuk40]

I am considering a few options to boost the power to my 1940 Ford sedan.
How much power can the frame safely sustain before you should box it?
I think that the most I would consider is approx. 300hp, with a 4 speed auto trans and 3.73 gears.

[V8COOPMAN]

Lots of guys long before you (including me) have done as much and more, without the need for boxing.......have at it. Sound frame to start with, of course. DD

[scooder]

No need to worry, frame will be fine. There is also a gert Big sedan body bolted to it, that ads some rigidity.
300 hp, were talking flathead here with a supercharger yes? 300 over head valve hp will make the 40 upset, unless it's an ardun or similar.
Martin.

[Ol' Ron]

Had a friend back in the 60's ran a blown Olds in the 10's, might have twisted abit.

[Talkwrench]

This 34 is not boxed most of the mounts are bolt on and has been running a blown 350 C*8V [500 +HP] since back in the 80's I have seen it run a flat 11 seconds, lifting the left wheel completely off the ground.. Its currently running a tunnel ram as it was driven all the way to Tasmania and back, many times it has crossed our continent [with the blower] to national hot rod shows. It belongs to Nev Anderson , he is one of our founding hot rodders here in Western Australia..

[Canuk40]

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My first thought is a late 50's hemi - max. 354 cu in. Inspiration comes from Don Garlitts. His museum has a couple of 40's in his personal collection in Ocala. They are stunning.