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Re: 400 BB Mopar budget dyno test
[Re: Cab_Burge]
#1190581
03/04/12 02:44 AM
03/04/12 02:44 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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We have a stock stoke .030 over 400 in my boys Dart with the 383 crank. It has KB pistons and with Eddy RPM heads that we cut it has 10.6 comp. Has the MP .557 cam and a 750 DP. Never dyno'd it but in his 3550 lb Dart it has run 11.40's @ 117. Its pump gas drive anywhere street car. Thats real nice looking 400 you have there. Do you plan to try and dyno the 400 with any other combo's in it ? Ron
Last edited by 383man; 03/04/12 02:45 AM.
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Re: 400 BB Mopar budget dyno test
[Re: 383man]
#1190582
03/04/12 02:59 AM
03/04/12 02:59 AM
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Joined: Jan 2003
Posts: 5,484
SoCal
Brian Hafliger
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,484
SoCal
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I think the potential for much more power is there and I can say we did try a different topend package/camshaft and had good results.
I can't post that info yet...sorry.
Given the Thumpr cam has kinda low lift, especially using stock rockers I was surprised.
It sounded awesome with both setups and never missed a beat. Super simple combo that made great power everywhere. When I post the dyno sheets you'll see what I mean...very W I D E powerband.
Brian Hafliger
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Re: 400 BB Mopar budget dyno test
[Re: 383man]
#1190584
03/04/12 11:58 AM
03/04/12 11:58 AM
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Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
New Lenox IL
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Ron I never had any luck with 557 cam. simple upgrade to 590. BIG difference!  If yoour son wants to go faster, that will be easy/cheap fix. Don
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Re: 400 BB Mopar budget dyno test
[Re: scatpacktom]
#1190587
03/04/12 01:18 PM
03/04/12 01:18 PM
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Joined: Jan 2003
Posts: 9,870
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,870
Weddington, N.C.
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Dom, That 590 cam  might be just big enough to be a torque killer on Ron's son's 406. With his combo and weight the 557 seems to be to be just about right and it works very well for what is essentially a solid running and reliablly consistent package. 383-400's are more cam sensitive than any other motors in our stable due to that long rod short stroke. If I were to do anything on a 406 like that I'd run the longer 6.76 LY rod to get the piston weight down and lighten up the bob...that would work the heads even harder up top with no real downside.
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Re: 400 BB Mopar budget dyno test
[Re: Brian Hafliger]
#1190589
03/04/12 02:21 PM
03/04/12 02:21 PM
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Joined: Jan 2003
Posts: 74,942
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,942
U.S.S.A.
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Quote:
Quote:
What is going on with the guides in those 906 heads?
Not sure what you mean?
It looks like there is a lot of FUZZ on the guides in the pictures you took ?
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Re: 400 BB Mopar budget dyno test
[Re: hudsonhornet7x]
#1190592
03/04/12 06:19 PM
03/04/12 06:19 PM
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Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
pro stock
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pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
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I think the thumper is ground to sound more nasty than it really is? Similar to the Hughes Whiplash.
What pistons are you using? You using the B or RB rods?
383, Hemi 4-Speed, AlterKtion, D60
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Re: 400 BB Mopar budget dyno test
[Re: Brian Hafliger]
#1190593
03/04/12 06:24 PM
03/04/12 06:24 PM
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Joined: Jan 2008
Posts: 4,254
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,254
Canada
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Quote:
Just finished doing a 2 part build using a 400BB Mopar.
We took a steel 383 crank, stock rods, KB flat top pistons and filled the stock 400 block. First test was with 906 heads, milled .050 for 79cc and compression was 9.8:1 and zero decked.
We chose a thumpr hyd. cam, stock rockers, bowl cleanup in the ports, stock valve sizes (manley valves)and comp single springs.
Topped with an rpm intake, 1" open spacer and a box stock 750holley it made 427HP @ 5700rpm and 443Tq @ 4200rpm using TTI 1 7/8 headers. Here's a pic....
What are the specs on the Thumpr cam and is it a tall fill or short fill? What kind of water and oil temps were you seeing with the fill? Also, how much of a recess is left in the chambers in the quench area after milling the heads .050? Where you able to get any kind of half decent quench clearences? Or will I have to wait for the magazine article to find out?  
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