Re: 440 source heads real world numbers
[Re: DusterKid]
#1895394
08/19/15 03:12 PM
08/19/15 03:12 PM
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Joined: Aug 2003
Posts: 8,779 Mt.Gilead, Ohio
OhioMopar
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master
Joined: Aug 2003
Posts: 8,779
Mt.Gilead, Ohio
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I don't have an answer for you, but I would be interested in knowing, as well. I have a set of Stealths on my Bee.
1969 Dart GTS 340 1969 Super Bee X9 N-96 1969 Coronet R/T X9 N-96 2015 Dodge Dart GT 2019 Ram 2500 Big Horn. Looking for the original block for my Bee. The last 4 are 7449
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895410
08/19/15 03:36 PM
08/19/15 03:36 PM
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Joined: Oct 2008
Posts: 411 Harleysville, PA USA
Tommy D
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mopar
Joined: Oct 2008
Posts: 411
Harleysville, PA USA
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I have the CNC'd Stealth Heads on my '69 RR. 4.30 gears, 3800 RPM converter. M & H 275-60-15 stickies, and SS springs. I had one track day at Maple Grove where I made 9 passes and a bunch of changes. When finished, the best pass was an 11.62 @115MPH. My 60' times increased by a tenth over the best pass ever.
The engine is exactly the same as the one I replaced, except it's now a stroker with the Stealth Heads. The first engine was 440 CI with Ported 452's that had 2.14/1.81 valves. That engine ran a best of 11.54. Don't remember the MPH.
I believe there is some more to gain with the new combo and some tuning, but the overall gain was not what I expected. The good news is the heads look stock when painted. The bad news...if i had spent some additional dough on better heads, I'd likely have a 10 second car instead of an 11.60 job. Since i have no roll bar, it's not a big deal. Ultimately, the Stealths are a good intro head. If you're looking to go all out racing, there are likely better alternatives.
I too am interested in a direct comparison of the CNC's vs unported. Good luck.
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895414
08/19/15 03:41 PM
08/19/15 03:41 PM
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Joined: Jun 2006
Posts: 5,163 CT
GTX MATT
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master
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Posts: 5,163
CT
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What cam in the 440 and in the stroker Tommy?
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: 440 source heads real world numbers
[Re: lewtot184]
#1895458
08/19/15 05:12 PM
08/19/15 05:12 PM
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Joined: Jun 2006
Posts: 5,163 CT
GTX MATT
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master
Joined: Jun 2006
Posts: 5,163
CT
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find some info on stealth lower lift flow numbers. from what i've seen that's the problem. Maybe the valve job?
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895468
08/19/15 05:32 PM
08/19/15 05:32 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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From my bench last Friday.... New head, ootb, stealth valves and valve job. 4.375 bore, 28" test pressure;
Lift........ In/ex .100----65/50 .200---144/104 .300---207/139 .400---235/168 .500---247/183 .600---250/192 .700---253/197
I've had a few sets of these come through the shop over the past few years, and on my bench, mid-250's on the intake is pretty typical for them in ootb form.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895474
08/19/15 05:46 PM
08/19/15 05:46 PM
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Joined: Jan 2003
Posts: 31,050 Oregon
AndyF
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I Win
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Posts: 31,050
Oregon
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When I swapped from my 915 to the normal 440 source stealth heads my car picked up .2 in the 1/4. From what I've found online researching is the basic stealth heads flow around 268 cfm and the CNC version flow around 320ish. I have no idea what my old 915 heads flowed, they were pretty stock with a home port job done. Has anyone swapped from the reg stealth heads to the CNC version? Just curious as to how much I may be able to pick up with the CNC version heads. I'm looking to build a stroker in the future, but don't have all the coins at once to build it, so I thought maybe upgrading my heads now will be one less piece I need down the road. Rule of thumb is 2 hp per 1 cfm increase. So if the ported heads flow 50 cfm more than the unported heads you would be able to see up to 100 hp gain. I've run this test a few times and the rule of thumb is accurate as long as everything else on the engine can support the power increase.
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Re: 440 source heads real world numbers
[Re: fast68plymouth]
#1895519
08/19/15 06:54 PM
08/19/15 06:54 PM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
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master
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From my bench last Friday.... New head, ootb, stealth valves and valve job. 4.375 bore, 28" test pressure;
Lift........ In/ex .100----65/50 .200---144/104 .300---207/139 .400---235/168 .500---247/183 .600---250/192 .700---253/197
I've had a few sets of these come through the shop over the past few years, and on my bench, mid-250's on the intake is pretty typical for them in ootb form. are the new edelbrock rpm's much better?
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895538
08/19/15 07:16 PM
08/19/15 07:16 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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Same head, same port as above, but with seats recut, mild back cut on valves, and the bowls and short turns blended. No rework on the pinch area or around the guide boss.
Lift------in/ex .100----70/56 .200---146/105 .300---207/142 .400---244/168 .500---267/186 .600---271/201 .700---272/214
Ootb RPM head, ede valve job & valves Lift-----in/ex .100----67/50 .200---141/106 .300---209/144 .400---245/170 .500---269/186 .600---275/196 .700---278/201
Just keep in mind, not all ports on all heads flow the same. These numbers are what these particular ports flowed on these particular heads.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895551
08/19/15 07:31 PM
08/19/15 07:31 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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For comparison, here are some numbers for an Ede E-Street 75cc head. The 75cc chamber definitely has more valve shrouding compared to the 84cc heads, and has a noticeable impact on the low and mid-lift flow numbers.
Ootb head with ede valve job
Lift-----in/ex .100----62/52 .200---122/100 .300---183/137 .400---230/167 .500---262/185 .600---275/195 .700---282/201
Last edited by fast68plymouth; 08/19/15 07:34 PM.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895565
08/19/15 07:50 PM
08/19/15 07:50 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
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From the same flow bench, here are some numbers from some MCH CNC ported stealths. Stealth valves with back cut, MCH valve job, full CNC ported, std port size. Average flow for one left and one right cylinder.(#1 & #7)
Lift------in/ex .100----70/60 .200---161/113 .300---222/143 .400---263/169 .500---289/189 .600---305/205 .700---309/215
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895576
08/19/15 08:00 PM
08/19/15 08:00 PM
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Joined: Mar 2009
Posts: 2,467 Sydney,Australia
tex013
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Joined: Mar 2009
Posts: 2,467
Sydney,Australia
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i have run both stock Source heads , home clean up , and now CNC Source heads . On a 440 ci RB +0.055 bore . Solid flat tappet cam 258@050 - 540 gross lift (0.020 lash) , 10.75ish:1 comp Best ever pass on old heads was a 10.994@120.66 . Only ever ran 1 10 second pass mostly ran 10.10/18 range With the CNC best pass is in my signature - 10.88's . In fact at a street meet last night with no track prep I ran a 10.893 with a PB on the sixty of 1.497. Currently has a Eddy Victor manifold , gasket matched only , with Prosystems HP1000 carb .Mostly ran a M1 single plane and sometimes a BG 825 on older Source heads - BUT I had also run the Victor and HP1000 for minimal gains . On the chassis dyno there was about 30RWHP gain . This was all in flow - as the gain was in the swap from the 825 to the HP1000 . Timing needs did not change and only needed I think 1 more jet size in the rear . I know I need more cam but I am not legal for sub 11's and I do have a another block that is calling out for a 4.25 crank kit I am very happy with the result . are they a race head NO are they a good performance head YES with the proper prep . The straight plug is really nice too .
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 440 source heads real world numbers
[Re: Quicktree]
#1895649
08/19/15 10:40 PM
08/19/15 10:40 PM
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Joined: Feb 2005
Posts: 4,316 Prospect, PA
BSB67
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Prospect, PA
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Same head, same port as above, but with seats recut, mild back cut on valves, and the bowls and short turns blended. No rework on the pinch area or around the guide boss.
Lift------in/ex .100----70/56 .200---146/105 .300---207/142 .400---244/168 .500---267/186 .600---271/201 .700---272/214
Ootb RPM head, ede valve job & valves Lift-----in/ex .100----67/50 .200---141/106 .300---209/144 .400---245/170 .500---269/186 .600---275/196 .700---278/201
Just keep in mind, not all ports on all heads flow the same. These numbers are what these particular ports flowed on these particular heads. good to see you posting, don't be a stranger What he said!
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Re: 440 source heads real world numbers
[Re: DusterKid]
#1895813
08/20/15 10:30 AM
08/20/15 10:30 AM
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Joined: Jan 2003
Posts: 11,719 Portage,michigan
B3422W5
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I Live Here
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Great seeing you posting Dwayne.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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