my 400 street motor
#1385852
02/11/13 09:14 PM
02/11/13 09:14 PM
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Joined: Aug 2007
Posts: 2,449 nc
earthmover
OP
top fuel
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OP
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Joined: Aug 2007
Posts: 2,449
nc
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well working on the 400 like to see what you guys think of the build and how you think it will run.. stock stroke,rods,and pistons...cran cam hyd. 504/528 cut on 112 going in at 106...tm6 intake clean and matched, with 950 hp carb...heads are 906 little port work, factory oil pan cut and made to a deep pan, going to install baffels..also going to add no more then 150 shot of nos...727 , 3000 verta ,456 gears with ss duster ,70 duster ....so what do you guys think it will do ???? pistons are 70th in the holes, will have headers.... here is a link to the build as it is being done.. http://www.forabodiesonly.com/mopar/showthread.php?t=205404
Last edited by earthmover; 02/11/13 09:17 PM.
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Re: my 400 street motor
[Re: WO23Coronet]
#1385854
02/11/13 10:27 PM
02/11/13 10:27 PM
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Joined: Aug 2007
Posts: 2,449 nc
earthmover
OP
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OP
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Joined: Aug 2007
Posts: 2,449
nc
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Re: my 400 street motor
[Re: WO23Coronet]
#1385855
02/12/13 03:12 AM
02/12/13 03:12 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Quote:
Sounds like a stout build on the cheap! WAG on performance, high 11's on motor, high 10's on spray? Apparently the stock cast pistons can take quite abit of SAB ($h/t and abuse). When do you think you'll be able to run it?
I think you may be a little optimistic, here. I hope it runs good and don't want to rain on anyones parade, but what I see is a stock 400, probably around 8:1 @ the most, with stock iron open chamber heads, and some miss-matched bolt on stuff. Not trying to be a buzz-kill, but at the same time lets not set the guy up for a big dissapointment. My guess would be closer to Mid/high 13's on motor, with mid 12's on the bottle. IMO: Might not be any faster, but would likely be just as fast and much more drivable with a 750 carb. Would run better with a dual plane intake. It may jump out of the hole with the deep gears, but the motor is definatley not set up to run a gear that deep and it will run out of steam quick.
My advice: don't expect too much. Whatever it does.... Have fun with it!
Last edited by StealthWedge67; 02/12/13 03:18 AM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: my 400 street motor
[Re: StealthWedge67]
#1385857
02/12/13 11:08 AM
02/12/13 11:08 AM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
Sounds like a stout build on the cheap! WAG on performance, high 11's on motor, high 10's on spray? Apparently the stock cast pistons can take quite abit of SAB ($h/t and abuse). When do you think you'll be able to run it?
I think you may be a little optimistic, here. I hope it runs good and don't want to rain on anyones parade, but what I see is a stock 400, probably around 8:1 @ the most, with stock iron open chamber heads, and some miss-matched bolt on stuff. Not trying to be a buzz-kill, but at the same time lets not set the guy up for a big dissapointment. My guess would be closer to Mid/high 13's on motor, with mid 12's on the bottle. IMO: Might not be any faster, but would likely be just as fast and much more drivable with a 750 carb. Would run better with a dual plane intake. It may jump out of the hole with the deep gears, but the motor is definatley not set up to run a gear that deep and it will run out of steam quick.
My advice: don't expect too much. Whatever it does.... Have fun with it!
I agree its not a very good combo at all . No ofense meant but it is a very low comp eng that dont need a single plane intake or a 950 carb. Just not a well thought out combo but I do understand you may be just throwing it together to have some fun. My sons 72 Dart is a .030 over 400 with Eddy RPM heads and the MP .557 cam. It has 10.6 comp with KB pistons and uses the RPM intake with a 750 DP. It weighs about 3550 with him in it and has run 11.40's @ 117 in good air with 3.91's. The 400 can run good without stroking it but it needs a piston to get some comp. Good luck , Ron
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Re: my 400 street motor
[Re: moparmafia]
#1385862
02/12/13 02:28 PM
02/12/13 02:28 PM
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Joined: Jan 2008
Posts: 4,255 Canada
WO23Coronet
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Posts: 4,255
Canada
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Seems like a decent combo to me, the only thing that doesn't fit is the "doggy" compression. Single plane, high stall, 4.56's, 3200 lbs, ported heads…I bet it will be suprisingley quick. He has a similar combo to the Mopar Performance Duster that was used to test the MP cams years back, and it was in the 11's. I still think the car will touch high 11's if the chassis is set up right and everything is just so. It also could be a high 12 car if the chassis is out of whack https://board.moparts.org/ubbthreads/show...e=1#Post7538803
Last edited by WO23Coronet; 02/12/13 02:57 PM.
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Re: my 400 street motor
[Re: StealthWedge67]
#1385866
02/12/13 04:01 PM
02/12/13 04:01 PM
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Joined: Jan 2003
Posts: 75,004 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,004
U.S.S.A.
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Quote:
Quote:
Some of you guys are not being POSITIVE ....
Ahhh, the new and more POSITIVE JohnRR..... LMAO. I think I miss the old John!
Blame my lady friend , she is always riding me for not looking at the world thru rose colored glasses
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Re: my 400 street motor
[Re: JohnRR]
#1385867
02/12/13 04:48 PM
02/12/13 04:48 PM
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Joined: Jun 2004
Posts: 6,780 Alabama
Mopar-Al
master
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master
Joined: Jun 2004
Posts: 6,780
Alabama
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Quote:
Quote:
Quote:
Some of you guys are not being POSITIVE ....
Ahhh, the new and more POSITIVE JohnRR..... LMAO. I think I miss the old John!
Blame my lady friend , she is always riding me for not looking at the world thru rose colored glasses
JohnRose-R I don't see it, my glasses fogged up when I even thought it
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Re: my 400 street motor
[Re: earthmover]
#1385869
02/12/13 09:24 PM
02/12/13 09:24 PM
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Joined: Jan 2003
Posts: 8,940 Holly/MI
Dean_Kuzluzski
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master
Joined: Jan 2003
Posts: 8,940
Holly/MI
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You have to remember.................there were lots of factory lo-compression motors that got MP cam stuffed into them, a single-plane HSD or TM6/7, headers, a holley and then they ran hard on the street or strip. How else did the wedge motors build any street credibility since even the 69-71 motors with 906's weren't as rated from the factory either.
The biggest booger in the soup is the really soft low-end torque from the lack of compression. High stall and lots of initial mech. advance will help.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: my 400 street motor
[Re: gch]
#1385872
02/13/13 12:42 AM
02/13/13 12:42 AM
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Joined: Mar 2012
Posts: 168 Washington State, USA
Winchester 73
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member
Joined: Mar 2012
Posts: 168
Washington State, USA
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before you spend money to cut the heads for compression you should read this: http://www3.sympatico.ca/big-d/460.htmthis guy made a 460 inch motor by grinding down a CAST crank to 400 mains and ofset grinding the rod journals.motor was built for 1500 bones and ran tens for years in a 3400 lb mirada.do the math 400 stroke =3.38 440 stroke =3.75 pistons move up .37 with a (free?)cast crank,how far are your pistons down?how much quench right now to the flat side of the chamber?
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Re: my 400 street motor
[Re: Winchester 73]
#1385873
02/13/13 03:21 PM
02/13/13 03:21 PM
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Joined: Aug 2003
Posts: 3,245 Between a rock & a hard place
cudadoug
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master
Joined: Aug 2003
Posts: 3,245
Between a rock & a hard place
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I had to dust off some notes to be sure, but here's a real world 400/72 Duster that I had in the 80's. OE 318 car, manual steering and brakes, weighed 3,384# with me and 3/4 tank.
OE 400 pistons were -.058 (average of 8 holes) down. Replacement rings and subbed a 383 steel crank. Why we did the steel crank I'll never know except that we "thought" the cast crank was junk. All we did was add weight, as the cast crank is lighter. DUH...
452 heads, ported to MP templates, 3 angle VJ.
MP .509 cam, TM-6, 750 DP
Hooker 1 7/8 Fenderwell headers (HATED those things!)
Stock 727 w/MVB, 10" B&M Holeshot (LOL!) converter, 3.91's 27" tall G60 Dunlop Qualifiers, with OE Ralley wheels.
BONE stock car, all steel, full interior, full exhaust to the bumper went low 13.80's @ 102
We made it go 13.61 @ 104 best by flipping spring hangers, subframe connectors, recurved dist, jetting, timimg, turn downs for the muffs at the rear end, etc.
Advanced the cam 6*...BOOM! 13.45 @ 106! Jetting changes resulted in a 13.38 @ 108 best.
Added a glass 6 bbl hood: 13.31 @ 108
Sealed the scoop: 12.90 @ 109
More jet/squirter changes: 12.78 @ 111
Still on Dunlop's and through full 2 1/2" exhaust.
I was accused many, many times of having a hidden bottle, or a low deck stroker. No one (ESPECIALLY Mopar guys) would believe that this smog motor could run with (and in many cases better than) their 440's!
We all know light wheels are a gain, right? I replaced the OE rallies with Centerlines. 15x7 rear on the same Dunlops and 15x3.5 fronts with a VW tire: 12.61 @ 113. And I'm driving it to work every day, rain or shine.
The car went on get a 440, blah, blah and eventually went 10.70's, but I digress. I had more fun with that 400 than I've had with many, faster Mopes!
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