|
Re: big block with factory heads how fast can i go?
[Re: Thumperdart]
#205547
01/27/09 03:42 PM
01/27/09 03:42 PM
|
Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
|
master
Joined: May 2004
Posts: 3,210
robin hood country
|
AL
What was your combo, cam, compression, etc.
Was it the purple Duster?.
Mike
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
|
|
|
Re: big block with factory heads how fast can i go?
[Re: moparmafia]
#205548
01/27/09 04:27 PM
01/27/09 04:27 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
To be honest, your 5.99 in the 1/8 is a 9.40 pass and figureing 3200 lbs thats gonna take 720 hp and to get that 720 hp you need right about 320 cfm head flow.... I dont think you can get that from a stock head 
|
|
|
Re: big block with factory heads how fast can i go?
[Re: moparmafia]
#205549
01/27/09 04:31 PM
01/27/09 04:31 PM
|
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
|
Quote:
Quote:
First off let me state this for those who are not clear on this point a 5.99 in the 1/8th will be low 9.40's in the 1/4.
While I am quite sure it can be done my first question would be WHY? You are gonna need something north of 700hp and getting that from a set of factory iron heads will require a lot of money being thrown at them. The amount of money you will have to spend to achieve this woudl be better spent on better parts. I have gone 9.60's at 3050 with a set of iron heads, but I had enough can in it to go Comp racing  Only so much you can get from a factory type head, so you are gonna have to make the motor think you got more by using a TON of cam. Now throw in a power adder and at least you can keep the dollar amount spent at a sane level for the return.
its just one of those things i have always wanted to try. i really dont see it being the most expensive build i have done. i already have 2 sets of 906 heads fully ported. i have built 2 500 inch indy motors in the past and i cant see it costing near that but i could be wrong. most of my friends all run either ford or chevy and they have always laughed and said mopar has the ugliest and slowest cars. i guess its crazy to try and max out a factory combo but its just a personal thing now.
you say you have the heads , build it and let us know how it works out ...
|
|
|
Re: big block with factory heads how fast can i go?
[Re: MR_P_BODY]
#205551
01/27/09 04:40 PM
01/27/09 04:40 PM
|
Joined: Jan 2007
Posts: 568
Ky
moparmafia
OP
mopar
|
OP
mopar
Joined: Jan 2007
Posts: 568
Ky
|
Quote:
To be honest, your 5.99 in the 1/8 is a 9.40 pass
and figureing 3200 lbs thats gonna take 720 hp
and to get that 720 hp you need right about 320 cfm
head flow.... I dont think you can get that from a
stock head
you are probably right about the 320 head flow. i have never seen a factory head flow that much. we had a set here that flowed 305 but i dont think you could have gotten 1 more cfm out of it. but i had a 70 dart that weighed 3310 that had a 400 stroked to 500. it had mild 906 heads that flowed 256 and a comp .650. that car had spinning/ chassis problems like you wouldnt believe. i only made 4 passes and it went 6.59. it was nowhere near maxxed out and would have been 2-3 tenths quicker by hooking it. everyone said those heads were going to choke it to death til they seen it run. thats what got me to thinking maybe its possible to run the 5.99 with factory heads
|
|
|
Re: big block with factory heads how fast can i go?
[Re: moparmafia]
#205552
01/27/09 04:47 PM
01/27/09 04:47 PM
|
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
moparmanjames
pro stock
|
pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
|
Most of the chevy and ford guys I know are running stroker motors with big aluminum heads. You would be handicapping yourself bigtime but you could do it if you are just talking an 1/8 mile.
Port the crap out of some late 452's and throw some big tires and a ton of cam and gear in the car and go run your 5.99.
Last edited by moparmanjames; 01/27/09 04:48 PM.
|
|
|
Re: big block with factory heads how fast can i go?
[Re: jamesc]
#205554
01/27/09 06:31 PM
01/27/09 06:31 PM
|
Joined: Jan 2007
Posts: 568
Ky
moparmafia
OP
mopar
|
OP
mopar
Joined: Jan 2007
Posts: 568
Ky
|
Quote:
wouldn't max wedge heads be considered "factory" heads? i would think they would be a better starting point than a 906, 452 or 915 casting. to each his own but can't see the reasoning on this one. pound for pound a stock mopar wedge head just plain sux compared to what chevy and ford have had available...face it they just had better heads. if you only picked up a tenth after swapping from a set of 452's to a set of -1's i'd be looking for the plug wire(s) that
fell off 
then honestly i dont think you realize the potential of the mopar factory big block heads. i totally disagree that chevy and ford were better. this chevy way of thinking is my whole point in doing this. it would make me feel good to prove people like this wrong and show them pure mopar power.
|
|
|
Re: big block with factory heads how fast can i go?
[Re: moparmafia]
#205555
01/27/09 07:12 PM
01/27/09 07:12 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
You are dreaming if you think a factory 906 or 952 ported headed 440 in a big 70 GTX will run 5.90's maybe 6.70-6.80 with a good suspension..
|
|
|
Re: big block with factory heads how fast can i go?
[Re: cudasteve68]
#205559
01/27/09 11:28 PM
01/27/09 11:28 PM
|
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
|
master
Joined: Jan 2003
Posts: 9,985
Frostbitefalls MN (Rocky&Bullw...
|
Most of the responses here say save the money and go aftermarket heads. I agree to a point. You can run what you have and ring the most out of them with a tunnelram and big roller, and if you do it right with a very efficient oilpan to reduce windage, and very well designed piston and ring package I think its possible at a sealevel track. It will be on the edge though!
I would set the shortblock up with a zero deck to allow the move to either Indy SR or 440-1 heads to pick up the pace at a later date and replace those crack prone 906s.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
Re: big block with factory heads how fast can i go?
[Re: tjmarcus1]
#205561
01/28/09 12:46 AM
01/28/09 12:46 AM
|
Joined: Jan 2003
Posts: 19,361
Las Vegas
Al_Alguire
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 19,361
Las Vegas
|
Well you asked how fast you can go. I thought I stated earlier but here goes. My old iron headed deal ran well at a best of 9.69, but that was at ONLY 136 mph. I did manage a best of 6.15 but that was at 3050 lbs. The car worked very well, particularly in the first 330', it never mile per houred at all. In that sense it was more like a Super Stocker than the average bracket car. Heck it went low 1.30 60's always and managed a 1.28 best. My Barracuda is not much better in the 60' at 1.5+ seconds faster. I understand the why of proving a point. Lord knows I have done similar stuff a few times. I built my iron headed deal to prove a point in a way, that you dont need aftermarket aluminum heads to run 9's in a typical back half bracket bomber. I had a 480" BB with a stock steel 4" stroke crank, inexpensive aluminum rods and shelf Ross pistons(13-1). If I recall the heads were just shy of 270 cfm. The cam was large by huge. I dont have the cam card any longer as I sold the car but it was in excess of .850" lift and the duration was in the upper 280's at .050" It used a set of springs up a season. I had to lash the valves pretty much all the time but I like to work on stuff so it did not bother me. The first thing the new owner did was loose the cam and the car responded by slowing down a bunch, to a 10.teen car. My point is I have been there done that. Thought I made that point earlier. Can you go 5.99 at 3200 pounds on leafs with no power adder and iron heads....I will say NO, but what do I know. IF you can it will be a very costly venture. Feel free to prove me wrong, as stated I will be the first in line to congratulate you. BTW the guy who pointed out the SS/AH stuff is apple to oranges. Do you really think you can compare a set of AH prepped Hemi heads to an iron ported wedge head? Are you also saying a 3200lb stock suspension(leafs)car can compare to prepped Super Stocker? Hello!!!! FWIW here is my turd that had the iron heads and ran ok... 
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
|
|
|
Re: big block with factory heads how fast can i go?
[Re: HUSTLESTUFF]
#205563
01/28/09 07:46 AM
01/28/09 07:46 AM
|
Joined: Oct 2007
Posts: 299
Sparta, TN
mark42202
enthusiast
|
enthusiast
Joined: Oct 2007
Posts: 299
Sparta, TN
|
I run a stock bore, stock stroke 440 with 915 heads, .520 lift cam, launch at 2900 off the foot brake, shifting at 5700rpm with 4.30 gear and run 6.70's in my 64 Fury at 4000ft d/a on alky. It weighs 3420 with me in it and a full fuel cell. I think it can be done if you put the money in the right spots. I say go for it!
Last edited by mark42202; 01/28/09 07:47 AM.
|
|
|
Re: big block with factory heads how fast can i go?
[Re: S/ST 3040]
#205565
01/28/09 10:26 AM
01/28/09 10:26 AM
|
Joined: Feb 2004
Posts: 2,495
Richmond , Virginia
BEEQUIK
top fuel
|
top fuel
Joined: Feb 2004
Posts: 2,495
Richmond , Virginia
|
Quote:
I'm not saying one way or the other but, doesn't
Don Little run a 383 in his 70 Challenger?
Currently 9.70 @ 136.20 in GT/FA (S/S)
This may be true but to reiterate Al's point, How much is Don Little gonna sell you a set of those heads for? And it's not just those heads that makes that car run those numbers.Those guys do things to those cars we can't imagine,thats why they are so impressive.I have seen some stock eliminator pieces being made that would blow your mind for a hundredth or two gain.Those guys are nuts ,IMO.
|
|
|
|
|
