More HP in a 400 4bbl

[SE72]

Does anyone have some tips of how to get more power into it. I have abt 250 hp now but was thinking of something like 350 to 400 hp. I was thinking of wich parts and prices, any tips is welcome

[Runner]

what is the motor, a bone stock mid 70's 400?

[SE72]

Yes its a 72

[Ghoste]

How much are you willing to spend?

[SE72]

Im not sure but something around 3 to 7000 usd, do u know how far i will get with that amount

[TruckDriver]

This is what I plan to do to mine. I'm aiming for about 4-500hp. This is from notes I took from this board and that old one...

750 edel carb.
edel. 4bbl. intake (I already have the 383 Performer intake)
windage tray
TTI Headers Ceramic Coating with Thermal Barrier inside
2-1/2" dual exhaust with X pipe, Dynomax 17748 Super Turbo Mufflers
Engle K54 cam, you can use the K56 as well for more midrange power at a slightly higher power band, anything bigger & the converter needs to be changed to match. (Probably add 30 + Useing the K54 cam, The carb., headers and cam, windage tray should give about a 100-150HP gain or so)

NOTE

I got these ideas from the members of this board. I'm still in the process of doing it.

[Ghoste]

One of the first things you will need to do is find and befriend a good machinist.  And I mean a GOOD one.  There is a lot of power potential to be found in proper machining and assembly.  Component selection seems confusing with so many choices and opinions out there but if you look past the glossy catalogs at real world results, it becomes clearer.
There are a few extraordinarily sharp Mopar race engine builders on this site and their advice is gold.
You will probably spend closer to the 7 than the 3.

[Chryco Psycho]

you can gain quite a lot with just closed chamber heads & a good cam choice , I highly recommend going through the bottom end as well though & get  a GOOD machinist

[TruckDriver]

you can gain quite a lot with just closed chamber heads & a good cam choice

I only heard of closed chamber heads, never known anyone to run them. What makes them work better? Whats the power gain like in HP? About how much would it cost me to have it done?

[Ghoste]

If you know anyone running the small chamber aluminum E-heads, they are closed chamber. Ron or Neil can explain the science better but it's about quench areaa and squish and flame front and so on.  Hmmm, voodoo?

[Chryco Psycho]

the closed chamber heads are far superior , by bringing the piston very close to the head [approx .040-.070] on the side of the chamber away from the spark plug it drives the air across the chamber at very high speed into the flame front from the spark plug this increases the power realized in the chamber due to higher mixing & turbulence & also has the benefit of resisting detonation , on a 400 the piston is usually too far away from the head due to low compression to really get the effect of but it still raises the compression by 1 point over the open chamber heads which will increase power
generally you can get 516 castings very easily & cheap , to machine the heads & replace the exhaust valves with 1.81 valves & have the hardened seats installed with porting will run approx $750-$850 = the cost of valve springs, retainers & the heads themselves

[dustyswinger]

Stroke it...440 source has rotating assemblies from $1389.00. My small block stroker made 515 HP and 515TQ. A big block will easily make 525-550 hp on pump gas. ?  ?
Try this ? topic also


? http://www.dodgecharger.com/forum/index.php/topic,427.0.html