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Re: stroker vs. aftermarket heads
[Re: 68cuda2003]
#661349
04/05/10 01:13 PM
04/05/10 01:13 PM
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Joined: Aug 2003
Posts: 43,088
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,088
Bend,OR USA
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Let see if I can help you on this descesion, I have several motors that have been ran in my 3400 lb street, pump gas Duster. The first motor was a 512 low deck with 906 heads like yours, 9.25 to 1 comp ratio, with a six pak intake set up,Comp Cams solid roller cam, it ran 10:69 at 123 MPH with the iron heads. I switch heads (same compression ratio, 84 CC heads on both)to a set of Eddy RPM CNC ported by MCH, the car ran 10:49 at 128.5 MPH. The second motor is 446 C.I. 440 block with the same 906 heads off of the stroker, 9.46 to compression, Eddy RPM Performer intake,Holley 950 HP carb. Comp Cams XE284HL cam. This motor ran 11:30 at 119 MPH. Either way will pick the car up, I would do the stroker kit, 4.25 stroke or larger  Make it pump gas freindly, unless you have unlimited access to E85 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: stroker vs. aftermarket heads
[Re: Cab_Burge]
#661350
04/05/10 04:19 PM
04/05/10 04:19 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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I'd go heads, that's where the power will be. displacement will just give you what RPM the powerband will be, everything else being equal.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: stroker vs. aftermarket heads
[Re: 68cuda2003]
#661352
04/05/10 04:56 PM
04/05/10 04:56 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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My opinion is to do the stroker kit now, put the engine in then later all you need to do is through the heads at it... no more pulling the engine 
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Re: stroker vs. aftermarket heads
[Re: tboomer]
#661355
04/05/10 05:37 PM
04/05/10 05:37 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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Lot of people would be disappointed in thinking the 440 vs 500 is big gains given the same other parts and topend. The 3.75 stroke will get it done with the correct heads. Stock heads ported heads even pro done will usually make a great tow motor with a long arm.... In a nut shell you would be narrowing the power band, which IMO is counter productive in a racey type build. Fact is the two same engines will have similar power outputs given the same parts in this type motor. Well the stroker might make a little more mid range, but suffer from topend Asama for breathing with stock heads.
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: stroker vs. aftermarket heads
[Re: Bob_Coomer]
#661356
04/05/10 05:49 PM
04/05/10 05:49 PM
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Joined: Sep 2008
Posts: 2,840
Flint, Michigan
B1Fish540
master
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master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
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Quote:
Lot of people would be disappointed in thinking the 440 vs 500 is big gains given the same other parts and topend. The 3.75 stroke will get it done with the correct heads. Stock heads ported heads even pro done will usually make a great tow motor with a long arm....
In a nut shell you would be narrowing the power band, which IMO is counter productive in a racey type build.
Fact is the two same engines will have similar power outputs given the same parts in this type motor.
Well the stroker might make a little more mid range, but suffer from topend Asama for breathing with stock heads.
 also, Look at the power Wild Bill is making (700+) with a 440, smallish solid cam, and Eddy heads! get the heads first! 
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Re: stroker vs. aftermarket heads
[Re: challenger73400]
#661359
04/05/10 07:22 PM
04/05/10 07:22 PM
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Joined: Jan 2003
Posts: 9,980
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,980
Frostbitefalls MN (Rocky&Bullw...
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Quote:
From your original post I gather you have stock rods and stock crank. I would make sure I had the bottom end built to handle the rpm your gonna turn with the better breathing heads or it could get real expensive especially if you step up on cam to take advantage of the better flowing heads.
Good luck!
I agree. You want to build a solid foundation first, leave the heads till later due to them being crack prone. If that happens, you aren't out much. If you go heads first, your choice of gears and converter will probably be different. So you save there. Basically, the low end torque of the stroker will be close between the iron heads and the aluminum heads. The shift point will rise and the hp will go up. Also, you will have an animal on the street with the extra cubes, even with iron heads.
In the end, stroker Vs stock the stroker will be faster with either heads.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Sorry I know this didn't help much 
