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'915 440 build How much HP possible? #2638593
03/29/19 07:28 PM
03/29/19 07:28 PM
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The Great White North
RAMM Offline OP
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I was looking around the shop and noticed I have almost enough parts to screw a pretty nice 440 together.

There are some stipulations of course: Anything in bold is a must, no ifs ands or buts

446-452 cube stock stroke
Stock stroke steel crank (with some love)
6.8-7.1" Con rods
10.5 Comp
.600" at the valve and zero lash Solid flat tappet is preferred but a solid roller is optional
Rocker arms must comply with Stock Eliminator rules
915 casting cylinder heads ported with no filling of any kind
Passenger car headers with a minimum 3.5" collector
950 carb
Conventional manifold ( RPM, Super Victor, M1 etc...)

That's pretty much it in a nutshell. Driveability is not really a concern as this is more of a dyno only EMC style build. I'm looking
for max RPM capability somewhere close to 7000 if the heads can do it. An unspoken goal is 600-600+hp same or close in torque. J.Rob



Last edited by RAMM; 03/29/19 07:29 PM.

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Re: '915 440 build How much HP possible? [Re: RAMM] #2638608
03/29/19 08:31 PM
03/29/19 08:31 PM
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Bend,OR USA
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Cab_Burge Offline
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If it was me I would have the stock crankshaft offset stroke down to BB Chevy rod journal size along with increasing the stroke to 3.90 or 3.91, which ever your crank grinder can get out of it. This will allow you a lot better choice on the rods and pistons also work twocents
But I ain't you shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: '915 440 build How much HP possible? [Re: RAMM] #2638623
03/29/19 09:46 PM
03/29/19 09:46 PM
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Val-haul-ass... eventually
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BradH Offline
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I don't know the potential of the 915 heads. Everything else you outlined is very close to my old Stage VI-head combination.

Re: '915 440 build How much HP possible? [Re: BradH] #2638629
03/29/19 09:57 PM
03/29/19 09:57 PM
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So. Burlington, Vt.
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The heads can flow enough to make that power.

The rest of it is pretty cut and dried........ then tweak after it’s running.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: '915 440 build How much HP possible? [Re: RAMM] #2638695
03/30/19 05:49 AM
03/30/19 05:49 AM
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1Fast340 Offline
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Many years ago there was an build article in one of the magazines where a iron headed 440 made some 660 hp i wish i remembered more but it had ported production heads. so it can be done thats for sure.

Re: '915 440 build How much HP possible? [Re: 1Fast340] #2638718
03/30/19 08:45 AM
03/30/19 08:45 AM
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central texas
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it was a Dulcich build and he ported some 915's and put 2.19 intake valves in them i think.
the big HP number was with a tunnel ram also ported, with two holley 9379 carbs...

the article is online, it can be found with a google search. maybe search "mopar 440 9379 915 heads"

Re: '915 440 build How much HP possible? [Re: RAMM] #2638719
03/30/19 08:46 AM
03/30/19 08:46 AM
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I did a very similar engine with aluminum heads that didn't flow as well as my old 915 heads I ported
Mine made 585/590 horsepower and torque
That was a CH-28 intake and I kmow it would have pulled much better up top with a nice Victor on it

Re: '915 440 build How much HP possible? [Re: Dunnuck Racing] #2638724
03/30/19 09:06 AM
03/30/19 09:06 AM
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Charlotte, North Carolina
sgcuda Offline
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My first dyno'd race engine was a 440 + .030" 915 heads with 2.14/1.88. Ross domes, Herbert roller, OOTB Team G and 9375 Holley 1050, Hooker 2 1/8" headers. Made 575 hp @ 6,100 rpm, 545 tq @ 5,400 rpm.. I'm sure, since this was so long ago, that better parts are available to well exceed the 600 hp goal that you want.

Re: '915 440 build How much HP possible? [Re: RAMM] #2638726
03/30/19 09:11 AM
03/30/19 09:11 AM
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Originally Posted by RAMM

There are some stipulations of course: Anything in bold is a must, no ifs ands or buts
.600" at the valve and zero lash


Except for hydraulic style cams, I don't know where you are going to find a solid flat tappet or roller cam that will work at zero lash.

Re: '915 440 build How much HP possible? [Re: sgcuda] #2638733
03/30/19 09:27 AM
03/30/19 09:27 AM
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Originally Posted by sgcuda
Originally Posted by RAMM

There are some stipulations of course: Anything in bold is a must, no ifs ands or buts
.600" at the valve and zero lash


Except for hydraulic style cams, I don't know where you are going to find a solid flat tappet or roller cam that will work at zero lash.


I’m sure that spec is for rules compliance checking only.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: '915 440 build How much HP possible? [Re: fast68plymouth] #2638738
03/30/19 09:37 AM
03/30/19 09:37 AM
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915 heads should still make the power with a .600" lift limit. My cam was a .660/.620. I don't think that little difference will be much of a loss. Make it up with the ramps and duration.

Re: '915 440 build How much HP possible? [Re: sgcuda] #2638742
03/30/19 09:44 AM
03/30/19 09:44 AM
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The main questions I have are, if it’s an actual contest build, what is the tested rpm range, and is it a “10.5:1cr” rule?(meaning 10.51:1 is grounds for DQ)

The lowish lift makes the rocker selection easier....... just use 1.5’s.

Part numbered off the shelf headers required?

“950” carb.
How is that being determined? Any carb marketed as a “950”?

Seems pretty straightforward.......
Get the heads into the 290cfm range........try a couple intake manifolds(carb spacers?), maybe a cam or two.

What’s the oil pan rule?
I assume there’s a spec fuel too?


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: '915 440 build How much HP possible? [Re: fast68plymouth] #2638751
03/30/19 10:08 AM
03/30/19 10:08 AM
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Creston, Iowa
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Mine:

1974 Dodge Dart 2dr 3300lbs at the line.

440 zero decked w/flat top pistons. Ported 915 heads flow 268/207 peak. 11.25:1 Compression

Mopar 590 Solid Cam

850 HP carb- Wilson Tapered Carb Spacer 1", M1 intake, McCandless/ ProParts Headers


727 trans w/ Dynamic 9.5 converter (hi gear flashes 5100) 4.30 gear, 30x9 slicks

Footbrake @ 1800rpm shift at 6200

Bests so far:

10.77 @ 122.8 mph 1/4

1.47 60 ft
6.80 @ 99.79 1/8th


This is the rundown on my home built 440..........engine dynoed 560 HP @ 6200 and 520lbs torque

Yours would have roller cam, better flowing heads and bigger carb.......less compression

With attention to detail and some Engine Masters tricks I would say 600 plus would be attainable

Good luck with your project

Last edited by 340man4ever; 03/30/19 10:11 AM.

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Re: '915 440 build How much HP possible? [Re: Cab_Burge] #2638755
03/30/19 10:13 AM
03/30/19 10:13 AM
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The Great White North
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Originally Posted by Cab_Burge
If it was me I would have the stock crankshaft offset stroke down to BB Chevy rod journal size along with increasing the stroke to 3.90 or 3.91, which ever your crank grinder can get out of it. This will allow you a lot better choice on the rods and pistons also work twocents
But I ain't you shruggy


Stock stroke is in bold, however I do agree and will turn the rods to 2.200" just for the superior rod selection and reduced bearing speed. J.Rob


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Re: '915 440 build How much HP possible? [Re: 1Fast340] #2638759
03/30/19 10:25 AM
03/30/19 10:25 AM
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Originally Posted by 1Fast340
Many years ago there was an build article in one of the magazines where a iron headed 440 made some 660 hp i wish i remembered more but it had ported production heads. so it can be done thats for sure.


That had a tunnel ram and 12.5 comp--so not even close to comparable. It was Dulcich's IronHeaded Air Hammer that you are thinking of I bet. J.Rob


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Re: '915 440 build How much HP possible? [Re: fast68plymouth] #2638760
03/30/19 10:26 AM
03/30/19 10:26 AM
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Originally Posted by fast68plymouth
The heads can flow enough to make that power.

The rest of it is pretty cut and dried........ then tweak after it’s running.


And how much flow is that? J.Rob


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Re: '915 440 build How much HP possible? [Re: sgcuda] #2638761
03/30/19 10:28 AM
03/30/19 10:28 AM
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Originally Posted by sgcuda
My first dyno'd race engine was a 440 + .030" 915 heads with 2.14/1.88. Ross domes, Herbert roller, OOTB Team G and 9375 Holley 1050, Hooker 2 1/8" headers. Made 575 hp @ 6,100 rpm, 545 tq @ 5,400 rpm.. I'm sure, since this was so long ago, that better parts are available to well exceed the 600 hp goal that you want.



I hope you're right but the '915 heads are the limiting factor here. J.Rob


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Re: '915 440 build How much HP possible? [Re: krautrock] #2638763
03/30/19 10:28 AM
03/30/19 10:28 AM
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Originally Posted by krautrock
it was a Dulcich build and he ported some 915's and put 2.19 intake valves in them i think.
the big HP number was with a tunnel ram also ported, with two holley 9379 carbs...

the article is online, it can be found with a google search. maybe search "mopar 440 9379 915 heads"


Correct and it had big compression too. J.Rob


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Re: '915 440 build How much HP possible? [Re: RAMM] #2638764
03/30/19 10:29 AM
03/30/19 10:29 AM
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I had some cnc’d ones here that flowed mid-290’s.

No holes, no fill.

Those were the best flowing non-MW factory iron heads I’ve tested.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: '915 440 build How much HP possible? [Re: fast68plymouth] #2638766
03/30/19 10:30 AM
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Originally Posted by fast68plymouth
Originally Posted by sgcuda
Originally Posted by RAMM

There are some stipulations of course: Anything in bold is a must, no ifs ands or buts
.600" at the valve and zero lash


Except for hydraulic style cams, I don't know where you are going to find a solid flat tappet or roller cam that will work at zero lash.


I’m sure that spec is for rules compliance checking only.


Correct again Dwayne, I should have been more clear and said .580" the max lift. J.Rob


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