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Re: 543 440 Combo's
[Re: Dragula]
#2854674
12/03/20 08:18 AM
12/03/20 08:18 AM
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Joined: Dec 2013
Posts: 403
Romulus, MI
GTS340
mopar
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mopar
Joined: Dec 2013
Posts: 403
Romulus, MI
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Been 6.02 so far at 3000lbs...with my little 400/512....It just seems like it does not pull as hard down track as my previous 440/512.....Which got me thinking about the bigger strokers they offer...The 526 and then the 543....Seems like my current combo with 20 more Hp would make it...
I just don't know about a 4.5 stroke in a stock block... Are you implying that the RB platform makes more power than a B platform in the same type of build? 1.6 intake rockers, have someone who knows what they're doing revise the Indy CNC ports/valve job, and porting the intake manifold would have got you there. As far as longevity, I agree with HardcoreB's recommendation.
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Re: 543 440 Combo's
[Re: GTS340]
#2854679
12/03/20 08:28 AM
12/03/20 08:28 AM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Yes is my quick answer.
We went 6.13 with a pump gas 512/440 without a lot of effort, and our race gas 400/512 runs about the same ET after lots of effort.....We suspect its the longer rods that allows the 440/512 to pull harder on top, but that's just a guess. It also took us a while to get the little 400/512 to mph the same. And you have to remember, its got smaller journals and weighs less, so where is the improvement?
I did learn, the 400/512 intake seems a bit more restrictive than the 440 based intake. I gained a bunch of ET when I ported the intake. So, it might be a plenum thing. We have debated this around the shop for a while as the small journal and light weight B combo should be faster than the RB, but it has not turned out that way for us. Same carb, same heads, same cam, same headers, same car.
So it begs the question, what happens if we go to a high compression 440 based unit of the next size up?
Last edited by Dragula; 12/03/20 08:44 AM.
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Re: 543 440 Combo's
[Re: Dragula]
#2854814
12/03/20 02:11 PM
12/03/20 02:11 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Build a 470, problem solved homey......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 543 440 Combo's
[Re: Dragula]
#2854887
12/03/20 06:27 PM
12/03/20 06:27 PM
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Joined: Aug 2008
Posts: 4,066
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,066
Mo.
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I did learn, the 400/512 intake seems a bit more restrictive than the 440 based intake. I gained a bunch of ET when I ported the intake. So, it might be a plenum thing. We have debated this around the shop for a while as the small journal and light weight B combo should be faster than the RB, but it has not turned out that way for us. Same carb, same heads, same cam, same headers, same car.
Dragula .....what cam, compression were use with the 400/512 combo i thought i read somewhere that you were useing -1's for heads ?
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Re: 543 440 Combo's
[Re: Dragula]
#2933097
06/14/21 09:49 AM
06/14/21 09:49 AM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,414
Toronto
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My parts arrived, and I would like to get back to this thread and see what HP you guys are at with one of these......I have Indy big easy 325 heads, so I am curious how far this will go. What kind of cam specs should I be shooting for? My little .680 lift 280 duration is staying with my 512/400 so I am going to need a new cam. I like the 280 duration, maybe more lift?
I will be in the 5's this year, one way or another... I am going to resurrect this thread from the dead as I am interested in how this build is going for you in the stock block, or if its running yet. What kind of clearancing was required? What external oil system did you end up with? Been considering this combo for my scamp with the Trickflow 270s and either a Solid FT or roller cam to get me into the 9's on pumpgas at 3400lbs.
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Re: 543 440 Combo's
[Re: mshred]
#2933203
06/14/21 01:29 PM
06/14/21 01:29 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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Running 6.0's at 113.7mph, trying to go into the 5's....I have about 13 passes on it, 11 all in a Friday Saturday stint where I ran two classes and made the semis in both and the starter quit in the lanes. Still tuning and replacing brand NEW parts. Plugs were dead rich....All new carb, convertor, motor....
The list of stuff that needing fixing/replacing was almost endless this year, but I am down to carb tuning, and another brand new high torque starter....And probably slicks very soon.
Then I learned I need my chassis re-certed to go 5's as its out, and probably a full face helmet & gloves...Not sure have to check.
Last edited by Dragula; 06/14/21 02:28 PM.
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Re: 543 440 Combo's
[Re: Dragula]
#2933250
06/14/21 03:47 PM
06/14/21 03:47 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,414
Toronto
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Running 6.0's at 113.7mph, trying to go into the 5's....I have about 13 passes on it, 11 all in a Friday Saturday stint where I ran two classes and made the semis in both and the starter quit in the lanes. Still tuning and replacing brand NEW parts. Plugs were dead rich....All new carb, convertor, motor....
The list of stuff that needing fixing/replacing was almost endless this year, but I am down to carb tuning, and another brand new high torque starter....And probably slicks very soon.
Then I learned I need my chassis re-certed to go 5's as its out, and probably a full face helmet & gloves...Not sure have to check. Yikes, sounds like some expensive bad luck, but also sounds like its movin and you'll be able to get after it. Maybe I missed it, but do you have the final engine combo posted somewhere?
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Re: 543 440 Combo's
[Re: mshred]
#2933362
06/14/21 09:26 PM
06/14/21 09:26 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
OP
I Live Here
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OP
I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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For the few runs I have on it, it runs very well. This year was wet and cold to start with, and I got zero testing in. So 6.07 at 113.9mph off the trailer isn't too bad leaving at 2400rpm and shifting at 6400...
As I lean it out, it will get meaner....It was super lean at idle, and then goes too rich at the hit....I have a wide band in the car this year....So I fattened up the idle, and leaned out the main jets and HSB, plus I have a 3-circuit shop carb to try out and my old 1250 2 circuit to see if its too big or not. So this Friday, I am going to to TNT if I can get the day off....Its a long shot due to a big IHRA event this weekend.
The list of busted stuff this year has been a real PITA......Broke the tongue jack on the trailer (my fault), broke the rear door on the trailer (not my fault), wiring & brakes on the trailer quite (not my fault), carb was off a bit, brand new starter fried.....stupid fuel pump has been an on going nightmare....GoPro died, and my AFR gauge gave me fits....
Last edited by Dragula; 06/15/21 11:46 AM.
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Re: 543 440 Combo's
[Re: Dragula]
#2933545
06/15/21 12:25 PM
06/15/21 12:25 PM
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Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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That's a lot smaller cam than I expected in that combo.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: 543 440 Combo's
[Re: an8sec70cuda]
#2933550
06/15/21 12:52 PM
06/15/21 12:52 PM
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Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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I went through a 541(4.375 x 4.500) that was built from a Mega Block several years ago.
Flat tops(12:1-ish), -1 heads, roller cam with 1.5 rockers.
I ported the heads and installed 2.25” intakes.
Made a little over 800hp with a 440-2/adapter and an 1150 on it.
With a ported Indy TR and 2 x 1050’s it made 848hp.
With the 4.375” bore It could be built out of a stock 440 block, but at that power level I’m not sure how wise that would be.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: 543 440 Combo's
[Re: Dragula]
#2933579
06/15/21 02:22 PM
06/15/21 02:22 PM
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Joined: Apr 2009
Posts: 3,414
Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,414
Toronto
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For the few runs I have on it, it runs very well. This year was wet and cold to start with, and I got zero testing in. So 6.07 at 113.9mph off the trailer isn't too bad leaving at 2400rpm and shifting at 6400...
As I lean it out, it will get meaner....It was super lean at idle, and then goes too rich at the hit....I have a wide band in the car this year....So I fattened up the idle, and leaned out the main jets and HSB, plus I have a 3-circuit shop carb to try out and my old 1250 2 circuit to see if its too big or not. So this Friday, I am going to to TNT if I can get the day off....Its a long shot due to a big IHRA event this weekend.
The list of busted stuff this year has been a real PITA......Broke the tongue jack on the trailer (my fault), broke the rear door on the trailer (not my fault), wiring & brakes on the trailer quite (not my fault), carb was off a bit, brand new starter fried.....stupid fuel pump has been an on going nightmare....GoPro died, and my AFR gauge gave me fits....
Impressive for sure! And only shifting at 6400....what gas are you running with the 14.5:1 CR?
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