Indy Heads-Boosted Stroker Question

Indy Heads-Boosted Stroker Question - 10/01/13 01:58 AM

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

Posted By: dvw

Re: Indy Heads-Boosted Stroker Question - 10/01/13 02:19 AM

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

Posted By: Slingshot383

Re: Indy Heads-Boosted Stroker Question - 10/01/13 05:03 PM

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.

Posted By: Brian Hafliger

Re: Indy Heads-Boosted Stroker Question - 10/01/13 05:08 PM

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

Posted By: go green

Re: Indy Heads-Boosted Stroker Question - 10/02/13 01:28 AM

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 .

Posted By: 70dusterjohn

Re: Indy Heads-Boosted Stroker Question - 10/02/13 01:59 AM

Quote:

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.

You can't use the 572-13 head on a 4.375 bore block ! It will need clearanced for the larger valve ! You will then shroud the valve ! They are suited more for the larger bore blocks! Any of the heads you listed would work good for a boosted stroker ! I would lean more towards the -1s or the victors !

Posted By: Clanton

Re: Indy Heads-Boosted Stroker Question - 10/02/13 02:19 AM

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.

Posted By: AndyF

Re: Indy Heads-Boosted Stroker Question - 10/02/13 02:26 AM

Hot Rod magazine did a blown 1400 hp low deck 451 a few years back. They used a stock block, 440Source crankshaft and unported Victor heads. Why don't you just copy their build?

Posted By: dart69bigblock

Re: Indy Heads-Boosted Stroker Question - 10/03/13 04:32 AM

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.

Posted By: Brian Hafliger

Re: Indy Heads-Boosted Stroker Question - 10/03/13 05:15 AM

Quote:

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.

I think I would go with the -1 heads personally but if you don't want a lot of rocker offset, the SR's will work great too.

Posted By: gregsdart

Re: Indy Heads-Boosted Stroker Question - 10/03/13 10:45 AM

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.

Posted By: Cab_Burge

Re: Indy Heads-Boosted Stroker Question - 10/03/13 08:02 PM

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

Posted By: MRMOPAR622

Re: Indy Heads-Boosted Stroker Question - 10/03/13 09:47 PM

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.

Posted By: hemi-itis

Re: Indy Heads-Boosted Stroker Question - 10/04/13 12:45 AM

What about a water/meth combo to lower the IAT's.What I read about Snow & IAS seems too good to be true

Posted By: dvw

Re: Indy Heads-Boosted Stroker Question - 10/04/13 12:53 AM

How fast do you want to go? Build accordingly. Anything quicker than 10.0 needs chassis cert,license,traction aids,etc. Is it a race car or street car? I guarantee a 10.0 street car on 275 radials is a hand full. Do you need a 20K motor with another 8k worth of chassis and saftey stuff? Maybe yes, so go for it. But don't do it just to blast around on the street, You don't need it.
Doug