5 liter MOPAR

450+ shouldn't be too tough.

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Just depends on what the budget is.

There was also some mention of turning it 8K?
I can tell you for sure....... that part isn’t cheap...... especially since it’s not a drag car(only sees short term use).

My main question would be...... what’s the budget for the motor?
And does it seem reasonable to build an 8000rpm 318 that can make 450hp, and last lap after lap, for that kind of money?

The 273 path just sounds like less power and more $$$ to me.