Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2101488
07/01/16 12:43 AM
07/01/16 12:43 AM
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Joined: Nov 2005
Posts: 1,943 San Angelo, Texas, U.S.A.
1968RR
top fuel
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top fuel
Joined: Nov 2005
Posts: 1,943
San Angelo, Texas, U.S.A.
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As far as pistons go, you'll need to look for ones that will give you around 10:1 compression. The Keith Black hypereutectic pistons (KB237) aren't too pricey and will probably get you around 10.75:1 with the 915s, which is a little high, but if you're using the right cam (and maybe a thick head gasket), you'll probably be OK on pump gas. You may want to repost this in the Unlawfl Race section. They can give some good advice on cam selection, etc. Good luck.
"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2101759
07/01/16 11:30 AM
07/01/16 11:30 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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with 915 heads use a flat top piston. with 906 heads use a quench dome piston.
bite the bullet and get some professional head work done. it's money well spent.
Last edited by lewtot184; 07/01/16 11:32 AM.
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2101764
07/01/16 11:38 AM
07/01/16 11:38 AM
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Joined: Jan 2003
Posts: 75,094 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,094
A Banana Republic near you.
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Add me to the 915 head crowd.
trying to get a quench dome piston fit properly into an open chamber head is a ton of machine work unless you can find a set of heads that have already had the required machining done.
Check the tech archive for the default 500 and 600 hp 440 builds posted by fast68plymouth.
running up my post count some more .
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2101933
07/01/16 03:34 PM
07/01/16 03:34 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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Your goals are acheivable with the correct parts, I've done it with 9.5 to 1 compression, 906 heads with 2.14 intake valves and 1.81 exhaust with mild porting and the Performer RPM intake with a 4781 850 Holley D.P. carb more than once The cam needs to be big enough to flow a lot of air and have more than 6000 RPM at peak HP, which means as much lift as posssible The old school cams got left in the dust by progress The last one of thos pump gas motors I built and dyno had a Reed solid lifter flat tappet cam with 104 LSA and a lot of lift, I don't remeber the grind number now but look at Reeds selection on BB Mopar cams and go from there Good luck, let us know your results
Last edited by Cab_Burge; 07/01/16 03:36 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 440 Iron head build only
[Re: Cab_Burge]
#2101949
07/01/16 03:57 PM
07/01/16 03:57 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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You've just entered the horsepower race and you have tied a cast iron head to your leg. Not logical to me. You should know going in that either the 915 or 906 (or any of the other open chamber heads) will flow, stock, a maximum of 230cfm. That'll just barely get you 500hp and is the reason the poster above had to crutch head flow with a pretty big cam.
Furthermore, unless you can find a set of heads that have already been ported and have a fresh valve job, you will spend more $$$ getting them ported and ready than you would on a pair of Stealths. Fast68 did a writeup on the subject and he's a professional head porter.
So before you spend a nickel on your cast iron heads, get a written quote on the cost. Then compare alternatives.
Another fact to consider is that Chrysler dyno tests of stock 440s usually ended up with a maximum of 335hp, and that's after hours and hours of running. This was covered in Mopar Action (RIP) several years ago in an interview with a former Chrysler employee.
I understand nostalgia, it can be powerful at times. Yet, the advantages of more modern technology are very hard to overcome with the old style parts.
R.
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2102304
07/02/16 01:21 AM
07/02/16 01:21 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I want to build a iron headed 440 using either 915s or 906s I would lookup Dulcichs' iron head porting articles (Muscle Motors iirc). Good info. iirc said the 452's are a FAR better candidate for porting (if not cracked) but as said there's the OC issue to deal with but OC might be needed with quench domes if you want quench (as said wont be cheap) if you cannot get quench with flattops/dished and 915's. definitely unschroud the valves on the chamber ends. measure twice/check your budget/get estimates & go from there
live every 24 hour block of time like it's your last day on earth
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2102463
07/02/16 12:51 PM
07/02/16 12:51 PM
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Joined: Oct 2011
Posts: 559 Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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I want to build a iron headed 440 using either 915s or 906s and I will be using the Edlebrock performer rpm manifold old school solid cam using isky adjustable rockers. I want the build to be around 500-550 hp with only mild porting since I already know the cost vs aluminum heads so could you guys help me with the specifics what or how you would go about this kind of build? Thanxs Step by step, using a bunch of old parts we had laying around, to take a 440 using the old replacement 6-pack pistons, 346 iron heads, 8.9:1 compression with an RPM manifold making 404 HP and 483 torque to 524 HP and 509 TQ. Then to 650 HP with EZ heads using the same shortblock and an old roller cam ground in 1968. 440 from 404 HP to 650 HP
Last edited by LaRoy Engines; 07/02/16 01:06 PM.
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Re: 440 Iron head build only
[Re: JohnnyBeGood]
#2105901
07/07/16 09:25 PM
07/07/16 09:25 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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I can only think of three reasons to consider using OE iron heads for a build like this.....
A- you already own a nice set of them, that have already been machined/ported/assembled with the components you require to reach your goals.
B- you are going to compete in a class where running OE iron heads is one of the requirements.
C- you have all the skills needed and equipment required to do the job yourself, and like doing that kind of work........ As well as a few sets of usable cores on hand.
Okay........ Maybe one more....
D- you have a car with some racing history and want to keep it as period correct as possible...... And accept that if none of A, B, or C from above apply, you're likely going to spend more money on the OE iron heads than you would if you bought certain aftermarket heads.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 Iron head build only
[Re: DARTH V8Я]
#2106166
07/08/16 11:35 AM
07/08/16 11:35 AM
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Joined: Jan 2003
Posts: 75,094 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,094
A Banana Republic near you.
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Or, you simply want to. Some of us are silly that way, as you know And a lil crazy.. like in my case I have some crazy modified stock iron intakes too, one from fast68plymouth ... and one that was acid ported ...
running up my post count some more .
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