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Re: How much gain for heads?
[Re: mopower440]
#1694580
11/04/14 11:54 PM
11/04/14 11:54 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I'm sure those 2.08/1.74 OE iron heads are holding you back. May I ask what is your SCR & Some OE iron SB intakes such as the 360 spreadbore piece are very good pieces, not sure about BB ones. Are your muffs free flowing/mandrel bends front to rear. Dist subsystems spot on?
live every 24 hour block of time like it's your last day on earth
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Re: How much gain for heads?
[Re: mopower440]
#1694586
11/05/14 12:26 PM
11/05/14 12:26 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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Call Todd Marsh and ask about the Sidewinder heads he sells. They're truly ready to bolt on when you get them from him. http://www.mopartsracing.com/You will see a big performance increase over the stock heads. Lose that stock intake and get a good aftermarket one at the same time. 
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: How much gain for heads?
[Re: Cab_Burge]
#1694587
11/05/14 12:33 PM
11/05/14 12:33 PM
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Joined: Jan 2003
Posts: 28,067
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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Quote:
I had several sets of 906 ported and added bigger valves, 2.14 intakes and 1.81 exhaust. They average 266 CFM on the intakes at .600, the OOTB Eddy RPM flowed 284 at .600 valve opening on the same bench  Thats 40+ HP plus the weight off of the nose of the car
Okay, this strikes a nerve with me.
Why do I care what the heads will flow at .600, .700, or higher lifts? Why does the OP care what the heads will flow above his .484 lift cam? He will never see it so it doesn't matter.
The cam I have coming for the Imperial has a .463 lift. I don't care if the heads fall out and completely stall at .600 lift. If they work well at .400 to .450 then I'm happy. It'll spend so little time between .450 and .463 that the flow there really doesn't matter.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: How much gain for heads?
[Re: HotRodDave]
#1694588
11/05/14 02:12 PM
11/05/14 02:12 PM
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Joined: Jul 2014
Posts: 72
Pennsylvania
Red 79
member
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member
Joined: Jul 2014
Posts: 72
Pennsylvania
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Quote:
If I was a BB guy in your boat this would be my first choice along with an RPM intake.
Too bad they made another head for a flooded market instead of a SB twisted wedge magnum.
https://board.moparts.org/ubbthreads/show...e=0#Post8320924
I had the same thought. With the huge increase in popularity for big cube small blocks it seems there is a large void in the cyl head market.
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Re: How much gain for heads?
[Re: feets]
#1694590
11/05/14 02:36 PM
11/05/14 02:36 PM
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Joined: Aug 2003
Posts: 43,123
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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Quote:
Quote:
I had several sets of 906 ported and added bigger valves, 2.14 intakes and 1.81 exhaust. They average 266 CFM on the intakes at .600, the OOTB Eddy RPM flowed 284 at .600 valve opening on the same bench Thats 40+ HP plus the weight off of the nose of the car
Okay, this strikes a nerve with me.
Why do I care what the heads will flow at .600, .700, or higher lifts? Why does the OP care what the heads will flow above his .484 lift cam? He will never see it so it doesn't matter.
The cam I have coming for the Imperial has a .463 lift. I don't care if the heads fall out and completely stall at .600 lift. If they work well at .400 to .450 then I'm happy. It'll spend so little time between .450 and .463 that the flow there really doesn't matter.
The reason I posted the flow results for my motor is that is what lift I had, if he is changing heads now when will he change cams?  BB wedge motors love having the valves open further and longer to make more power, same thing on bigger carbs.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: How much gain for heads?
[Re: mopower440]
#1694591
11/05/14 03:41 PM
11/05/14 03:41 PM
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Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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edelbrock heads are commonly said to be worth 50 HP over stock ones.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: How much gain for heads?
[Re: dogdays]
#1694592
11/05/14 03:55 PM
11/05/14 03:55 PM
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Joined: Jan 2003
Posts: 2,863
middle Tennessee
mopower440
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
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Quote:
There still isn't a decent block to use with a smallblock head that's over 300cfm, so why bother?
R.
To the OP: Your stock heads flow no better than 228cfm stock, and that's the best port. There's a 100hp potential in a set of Stealths, or Sidewinders which seem to the the latest and best budget head, or the ProComps, or the Edelbrocks even the street ones.
Performer RPM intake should be on your list as well.
I. I've been wanting an edelbrock rpm intake but everyone says its so tall that the carb will hit the hood and I'm not sure I want to cut a hole in my hood. Edelbrocks ain't my only prospects, stealths sound good also, just. Want heads that use the stock locaztion of the exhaust ports si I don't have to change my headers and would prefer to use my stock rockers and shafts. I am willing to upgrade my cam..
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Re: How much gain for heads?
[Re: feets]
#1694593
11/05/14 04:00 PM
11/05/14 04:00 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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Quote:
Quote:
I had several sets of 906 ported and added bigger valves, 2.14 intakes and 1.81 exhaust. They average 266 CFM on the intakes at .600, the OOTB Eddy RPM flowed 284 at .600 valve opening on the same bench Thats 40+ HP plus the weight off of the nose of the car
Okay, this strikes a nerve with me.
Why do I care what the heads will flow at .600, .700, or higher lifts? Why does the OP care what the heads will flow above his .484 lift cam? He will never see it so it doesn't matter.
The cam I have coming for the Imperial has a .463 lift. I don't care if the heads fall out and completely stall at .600 lift. If they work well at .400 to .450 then I'm happy. It'll spend so little time between .450 and .463 that the flow there really doesn't matter.
This is my reasoning also and that is part of why I say the new trick flows, the chamber is waaaaaay better looking than the 40 year old chamber in the eddy, stealth, sidewinder... a good chamber like that tends to help at low lifts a lot. The better chamber gives better mixture that also helps. You are on the right track with the flow but there is still more to it like port volume/velocity mixture quality weight...
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: How much gain for heads?
[Re: HotRodDave]
#1694594
11/05/14 04:13 PM
11/05/14 04:13 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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The Edelbrock, Stealth, Pro Comp, etc., heads all need to be gone through by a machine shop before being bolted on. The Trick Flow heads aren't even available yet. Todd Marsh has the Sidewinders he sells already checked out and any issues corrected. 
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: How much gain for heads?
[Re: an8sec70cuda]
#1694596
11/05/14 04:27 PM
11/05/14 04:27 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Going "waaaaaay back" in history here, but the data is still valid IMO.
Had stock rebuilt 440 w/ unported 906 heads, a 222 @ .050" x .455" hydraulic cam, stock converter, 3.55 gears, 1-3/4" headers, etc. With sticky street tires it ran a best of 13.2 @ 103 MPH.
Picked up a set of '452' castings machined for 2.14" / 1.81" valves. I did a fairly extensive home porting job on them w/ some touch-ups done by a local cylinder head shop. Swapped heads, along with switching from OEM stamped 1.5 rockers to Crane 1.6 iron rockers.
With no other changes, the first time I went back to the track the car ran a 12.5 @ 109 MPH, although the weather was awesome and the car dropped off a bit from that under more average conditions. Still, that means the head porting and increased rocker ratio for the small cam picked up 40-50 HP.
As suggested above, I'd be looking at set of "prepped" Sidewinder heads to get some serious CFM improvements in the <= .500" lift range.
"Your results may vary!"
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Re: How much gain for heads?
[Re: BradH]
#1694597
11/05/14 04:34 PM
11/05/14 04:34 PM
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Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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 Years ago my car ran 11.87 at 111.9 mph w/ a set of bone stock 906 heads on a 509/292 MP cammed 440. I switched to a set of mildly home ported 915 closed chamber heads...no other changes and the car ran 11.40 at 117.4 mph in similar conditions. That gain in flow and a little compression REALLY woke it up. Was a whole different animal.
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: How much gain for heads?
[Re: an8sec70cuda]
#1694598
11/05/14 07:36 PM
11/05/14 07:36 PM
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Joined: Jan 2003
Posts: 2,863
middle Tennessee
mopower440
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
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Quote:
Years ago my car ran 11.87 at 111.9 mph w/ a set of bone stock 906 heads on a 509/292 MP cammed 440. I switched to a set of mildly home ported 915 closed chamber heads...no other changes and the car ran 11.40 at 117.4 mph in similar conditions. That gain in flow and a little compression REALLY woke it up. Was a whole different animal.
tell me more, what was the rest of the combo?
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