Destroked 400?

[XP29H9]

A buddy of mine and I were talking about building a 400 engine.  He said that a man once told him that you can destroke a 400 engine to make a high rpm screamer with a lot of power.  Anyone ever heard of this?  From what I can find, it would definitely be a high power motor that turns a lot of rpms, but take a lot of maintenace to keep tuned. 

Any suggestions?  Or.. does anyone have any experience with destroked motors?  Opinions?  Do tell...

Thanks! 

[cdr]

no reason to destroke it ,it is a 3.375 stroke will already turn lots of rpm if heads,cam are correct

[cdr]

to turn lots of rpm cost lots more money than going 500 inch stroker

[hatersaurusrex]

Isn't that called a '383'?

[cdr]

Isn't that called a '383'?

400 has the same stroke as 383, 400 has 4.340 bore,383 has 4.250

[Chryco Psycho]

Can be done , probably just as effective to go to 440 rods lighten the piston & rod weight way down .

[XP29H9]

Well I'm thinking wouldnt it just be easier to build a 440?  I can either have a 400 or 440.  Everyone I hear and read talking about a 400 or building a 400 eventually says something like "the 440 is almost ready to drop in" or "getting a 440 soon".  There's no replacement for displacement right? 

How many rpms does a 440 turn? just wondering..

Are there any advantages to a twin carb set up?  or is it just as effective to have a single?   

I appreciate any and all input.

[cdr]

http://www.dodgecharger.com/forum/index.php/board,30.0.html

[Stretch]

400 block+ 440 crank+ 451+ Oh Hell Yah!!!

[c00nhunterjoe]

In general terms you are correct, more displacement means more power. BUT. The power is limited to how good your heads are. A450 inch motor will need some good flowing heads to make your max potential. In my opinion unless your are going to spend some decent money on heads then stick with a smaller displacement engine. But again, that's just me.

A 383 or 400 with a set of out of the box eddy rpm heads will max very good hp and tq numbers. It will rival that of th avg stroker build because thebigger cubed motors are essentially choked by the limited flow of most heads. The main difference between the stroker power and 383\400 power is the larger cubed motor will peak out at a much lower rpm then the 383\400 will based on the heads.

[1974dodgecharger]

In general terms you are correct, more displacement means more power. BUT. The power is limited to how good your heads are. A450 inch motor will need some good flowing heads to make your max potential. In my opinion unless your are going to spend some decent money on heads then stick with a smaller displacement engine. But again, that's just me.

A 383 or 400 with a set of out of the box eddy rpm heads will max very good hp and tq numbers. It will rival that of th avg stroker build because thebigger cubed motors are essentially choked by the limited flow of most heads. The main difference between the stroker power and 383\400 power is the larger cubed motor will peak out at a much lower rpm then the 383\400 will based on the heads.

thx for that info...seems adding a nice set of headers, cams, and what not without going into the engine itself gives ya more power..

[Cooter]

YOu know, "Destroking" a 400 Chrysler? Why? To gain high RPM power? I got news, the stroke in a 350-361-383-400 BB Chrysler is shorter than that in a 350 Small Block Chevy. They routinely spin them things past 8000 RPM. Course, they ain't slinging a heavy set of 4.340 Pistons on the end of the SBC rods either, but high RPM power is best left ot them "Roundy Round" guys. TORQUE is king on the street, and more stroke equals more torque.

And the 440 (Nearest and dearest to my heart), poor thing came through with a stroke of that of a small block 400 Chevy. (Or a "383" Chevy if you use the 350 block), and I see those thigns being spun rediculous RPM.

Yes, a 440 WILL spin past 7000 RPM. How do I know? Well, I've done it on occasion. If you have enough motor, you don't need RPM. Only Small Block guys need all that RPM to make power. BIG inch motors get it all done below 7000 RPM.