Need Help Quick. 400 stroker build or 440?

MidTexCuda said

I have a line on two cores. one a 400 and one a 440 both the same price.
I will stroke them both.
I am either going to go 511 with the 400 or 540 with the 440.0
I am buying the blocks on Sunday. I know the in's and out's of both I just need to know what would be better in a super light big tire street car with an auto.
All my current bolt on parts are 440. but I can sell them.
Pump gas.

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The 400 block will take over 800 hp, the 440 will be pushing it over 650 hp. The 440 main webs are weak. A 512 motor (400 block, 4.25 x 4.375) with the right goodies will over power most any tire on the street, so, the cube difference just isn't a big deal. For all out racing, the heads will dictate the power more than the difference of 28 cubes. As far as rpm, If you want max power at 6500, then a small port head like an SR will make great torque, and the 440-1 heads will move the torque peak up a fair amount, but will make more hp. As far as rpm, if properly done a street strip motor can handle 6800 from time to time and live a decent life. That would allow the bigger heads with a little less duration on the cam.