340 or 408
I know the 340 is a classic and the 408 is a torque monster. But something about the sound of a 340 spinning to 6800 rpm.
The plan was to build an aluminum head 340 with 10.25-1 compression pump gas deal with solid lifter cam. looking for 400 hp.
The Motor i am getting is a low mile 340 out of a 73-74 duster that rolled. I am not sure whats in there for components, but when did they stop putting a steel crank in the 340? My engine builder says we will use a better aftermarket rod anyway as well as a forged piston. The only thing we are missing in the end is a stroker crank. So i am torn between 340 or 408? I am spending the majority of the money anyway, so whats another $600 for a crank. The rest of the drivetrain will be 2500-2800 stall converter with 3.55 limited slip.
What is the smart way to go here?:happy1:
Well, in the other forged vs cast thread the guy was looking for 500hp. But if you goal is 400hp I think that is well within the relm of cast crank needs.
I bet it would be less that $600 more for a stroker crank when you figure machining your old 340 crank.
But the 416" stroker (w/340 block) is cheap hp/$. The cheapest if you are looking for streetablity and not a big "acting" cam.
My 416 revs surprisingly quick. I have a comp 274-S small solid cam. I'm probably at 430-450 hp. Very streetable to drive to the grocery store in it which I do.
What solid cam are you looking at for your 340? A stroker sort of "soaks up" cam.
Very generally speaking, you can go up one notch hotter cam and it typically will behave like a 340 with a notch lower cam.
66 more cubic inches with one size bigger cam, could give you about 50 hp gain.
Here's my 416 idling with TTI hearders/X pipe/full exhaust, comp 274-S solid cam, Edelbrock heads, M1 single plane.
[ame="http://www.youtube.com/watch?v=-8QSTlvdqSs"]416 Idling sound walk around - YouTube[/ame]
