Re: Indy Heads-Boosted Stroker Question
[Re: dvw]
#1510439
10/01/13 01:03 PM
10/01/13 01:03 PM
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Joined: Jan 2003
Posts: 684
St. Charles, MO.
Slingshot383
mopar
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mopar
Joined: Jan 2003
Posts: 684
St. Charles, MO.
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If you're boosted, then port velocity will be a given, look at the 572-13 heads, they really flow some air and will make it easier to make power.
1994 Undercover Chassis 125" altered
stack injected big block, soon blown and injected
Member of The Torque and Recoil Club
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Re: Indy Heads-Boosted Stroker Question
[Re: go green]
#1510443
10/01/13 10:19 PM
10/01/13 10:19 PM
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Joined: May 2011
Posts: 4,489
northern,Ohio,USA
Clanton
master
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master
Joined: May 2011
Posts: 4,489
northern,Ohio,USA
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Quote:
Edelbrock victor would make a 1000HP with low boost easy. Spend money on good valvetrain and not on the CNC port work bling . At that power range the Brok and Indys parts are still in the duty range of workability .
I am using the edel victor with a std port opening,HS rockers,Manton pr. 
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Re: Indy Heads-Boosted Stroker Question
[Re: Brian Hafliger]
#1510445
10/03/13 12:32 AM
10/03/13 12:32 AM
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Joined: Mar 2005
Posts: 68
Omaha, NE
dart69bigblock
OP
member
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OP
member
Joined: Mar 2005
Posts: 68
Omaha, NE
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Quote:
Quote:
I am going to be building a boosted low deck stroker and plan on 900-1000 at the crank. I am leaning towards Indy heads but am not sure which ones. I have found several used sets of Indy SR heads that have CNC'd and opened up to MW. Also on Moparts there's a set of Big EZ heads for sale. I know those don't flow as well on the exhaust side as the SR or 440-1 heads though. I know the 440-1 head is probably the best choice for maximum power but what are people's thoughts on a set of SR's with a good port job or the Big EZ's? I am not concerned with the exhaust port location or having to use offset rockers so those aren't really negatives in my decision. I am more concerned with how they will perform at that power level. Thank you for any advice you can provide.
Chris
How is your hood clearance? SR's will be taller than the rest. I love the SR's, they work really well.
I don't think you can go wrong with either the SR's or a good -1 cnc ported head.
Brian
Hood clearance won't be an issue. I will work around whatever setup I end up with.
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Re: Indy Heads-Boosted Stroker Question
[Re: dvw]
#1510447
10/03/13 06:45 AM
10/03/13 06:45 AM
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Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,010
Frostbitefalls MN (Rocky&Bullw...
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Quote:
If Dizusters almost stock 360 can make 750-775 HP (10.08@136/3700lbs). At the desired level I can't believe it really matters what head you use. That goal should easily be met with any aftermarket BB head.
Doug
I think it is easy to look at a boosted application in the wrong light. Boosted, is nothing more than an artificial good air day. A few pounds boost is about like going from Albuquerque on a very hot day (8,000 ft, probably 10,000 DA?) to mine shaft air Like the east coast gets spring and fall. The laws of physics just don't change. The air gets denser, that is all. It still reacts to head flow in the same way. Pick the heads accordingly. If the motor built will make 400 hp normally aspirated, then doubling the air (doubling air density, not boost) going in will at least double the power. The engine friction doesn't go up as much, so the percentage of gain can actually be more than the added air. As the air inlet temp rises, it loses density for the same boost, so AIT is very important.
As far as the EZ heads versus a standard port , the higher the boost, needs a bit less exhaust port percentage due to the higher pressures at the valve opening event.
Last edited by gregsdart; 10/03/13 06:56 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Indy Heads-Boosted Stroker Question
[Re: dart69bigblock]
#1510448
10/03/13 04:02 PM
10/03/13 04:02 PM
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Joined: Aug 2003
Posts: 43,215
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,215
Bend,OR USA
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I'm not sure at what power and tuning level the Mopar 400 production low deck blocks will fail at, are you going to use a stock 400 low deck block for this build? IF so what blower are you planning on using? Are you going to use a intercooler? The reason I'm asking is I have built,assembeld and dyno tuned several roots blown motors on pump gas and race gas, carbs and EFI. Manifold air inlet temps are critical on tuning a blown gas motor at WOT, the more pressure you build the more heat is created under the roots type blowers  My message is it is, in my mind and opinion, way better to use a 10.71 and spin it at 12% underdriven to make 7 lbs of boost than it is to use a 6:71 and spin it at 12% overdrive to make the same amount of 7 lbs boost  The IAT on the bigger, slower spinning blower, may be from 80 to 150 F cooler than with the smaller, higher spinning blower Also I would be very hesistant to use a stock 400 Mopar block at that power level, even with good main caps and studs, the cylinder walls will be the weak link in my opinion 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Indy Heads-Boosted Stroker Question
[Re: Cab_Burge]
#1510449
10/03/13 05:47 PM
10/03/13 05:47 PM
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Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
MRMOPAR622
top fuel
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top fuel
Joined: Sep 2003
Posts: 2,008
Sweet Home Alabama
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I agree with Mr Cab on the stock block.Indy makes a Maxx aluminum low deck block,it use's the std 440 crank mains,and dist.,4.50 block and the 572-13 heads fit on it.You can make 528 cu in 4.50 bore & 4.15 crank or 540 cu in 4.50 bore X 4.25 crank with the Low Deck maxx aluminum block.
"To Be The Man'You Have Got To Beat The Man"
"T/D and Pro-Bracket Racer"
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