CUUDAK
Well-Known Member
Actually the 400 has a bigger bore but less stroke. Different beast altogether imo!This is the type of build I'm looking for but with a 440. I wonder what the difference would be?
Actually the 400 has a bigger bore but less stroke. Different beast altogether imo!This is the type of build I'm looking for but with a 440. I wonder what the difference would be?
This is the type of build I'm looking for but with a 440. I wonder what the difference would be?
Considering the stock rockers, and almost stock heads yes I'm happy. Made good tq too considering the header was a bit large and stock stroke is only 3.380.
I was worried we wouldn't make 400 HP with the stock rockers...it sounded really good at 6000rpm!
A 1.6 or even 1.7 Hughes rocker would be the next step for me. After that, I'd look hard at the eddy heads. For the cost, I think they would be a definite plus. I would not overlook the Victor std port heads either....
I'd have to agree - heads and good rockers too. One thing to notice is the power curve. Torque is peaky with the 3.38 stroke and heads wont change that much. If it's in a street car and you can work the compression and quench from the get-go, I'd do so. The torque is low in the rpms where a street car uses it most - below 3K rpms. This is the main reason why the 383/400 platform isn't used more. At least IMO anyway.
What is the actual cost of this engine as pictured top to bottom?
And thanks for posting.
400 lbs. of TQ rising to 442 from 3000 - 5400 is a nice curve with the short stroke. I think the graph has a squished look and that would be the reason Moper said it looked "peaky."
No, not really. I think for street engine it is a peaky torque curve. I've attached a dyno test from a Challenger (new one) I found online. This is what a flat toraue curve looks like. The 400 will need gears to not feel sluggish, especially in a street car with 3 series gearing and a convertor around 2500.
I don't know...if you plot out the TQ from our 400 and spread it out like that graph I think you'll see what I mean. We had a wide spread of over 400ft. lbs. from 3000rpm to 5500rpm! It peaked at 5700rpm so...?
So what exactly are you going to do with that engine now (or did I miss that somewhere before?)
Going to sell it, stick it in a car, or put iti in the warehouse?
Ma Snart
The step on the IMM is 300rpm. If you take the numbers off the sheet (not the graph) and note the change over 500rpm they look like this:
3K - 3.5K 12
3.5K - 4K 19
4K - 4.5K 2
4.5K - 5K (-2)
On the one I posted:
3K - 3.5K 14
3.5K - 4K 4
4K - 4.5K 2
4.5K - 5K (- 8 )
Not an exact graph to trace both curves, but the torque on the 400 comes up fast, and drops off fast. At least by my perception anyway. It's again just my opinion, but I'd prefer a very flat torque curve for a street engine and that one isn't very flat.
It's not bad power to get. Its not a crappy engine by a long shot. But it IS demonstrative of a short stroke build... ie, steep power curves and peaky rpms. It will need to be coupled to gearing and convertor that puts it up in the 4K range to really be effective. That was my point.