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516 vs 915 heads #681373
04/26/10 11:15 PM
04/26/10 11:15 PM
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CT USA
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Nick Mineau Offline OP
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can anyone tell me if one or the other flow better. bolth have 1.6 exaust valves. i want to install 1.74 valves in whichever ones i choose. the 516 are in much better shape and i already own them and run them on my mild 440. the 915's arent mine and i would have to spend 300 $ just to buy them plus the $ for the machine work. tight buget. looking for some more getty up than the 1.60 valves offer. i heard mixed things. some say the heads are the same others say the 915 will flow better. im not planning on any porting.

Re: 516 vs 915 heads [Re: Nick Mineau] #681374
04/26/10 11:25 PM
04/26/10 11:25 PM
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Lincoln Nebraska
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RapidRobert Offline
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915's would flow better but without a doubt I'd read dulcich's iron head porting articles in mopar muscle and it'd break your budget now but I'd consider some alum ones w the kind of cash refurbishing the iron ones is going to cost to do em right


live every 24 hour block of time like it's your last day on earth
Re: 516 vs 915 heads [Re: Nick Mineau] #681375
04/26/10 11:27 PM
04/26/10 11:27 PM
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N.E. Ohio
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KillerBee Offline
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If your on a tight budget I would stick with the 516's.
With bigger exhaust valves the 516's will flow very close to the 915's in stock form.
The experts claim if you max port them, the 915's flow a little better but spending big $$$ on stock steel heads for maximum performance is not money well spent with all the aluminum head choices out there.
I have a set of 516's with larger exhaust valves on my bone stock 1966 440. With a MP .509 cam and Holley 750 DP in a heavy street car it ran high 11's.

5949246-challistrip.jpg (278 downloads)
Re: 516 vs 915 heads [Re: KillerBee] #681376
04/26/10 11:50 PM
04/26/10 11:50 PM
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CT USA
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Nick Mineau Offline OP
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what size valves did you run. any porting. i would be very happy with those times
im running a 3300 lb duster

Re: 516 vs 915 heads [Re: Nick Mineau] #681377
04/27/10 12:06 AM
04/27/10 12:06 AM
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N.E. Ohio
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KillerBee Offline
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Quote:

what size valves did you run. any porting. i would be very happy with those times
im running a 3300 lb duster




I went from the smaller 1.6 exhaust to the (newer stock) 1.74 size. Intake valves are stock size.
I did a little backyard smoothing of the ports, I didn't re-shape anything or remove any material, I might have made it slower.
Shortblock is a 40k original mile 1966 440, never touched, bone stock.
Heavy all steel street Challenger(less fiberglass T/A hood).
Hemi 4 speed with 4.10 rear gear.

I would think 11's would be real easy in a lighter A body as long as you get it tuned and dialed in right.

Re: 516 vs 915 heads [Re: KillerBee] #681378
04/27/10 12:19 AM
04/27/10 12:19 AM
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CT USA
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Nick Mineau Offline OP
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thanks. ill have a machine shop install som 1.74

Re: 516 vs 915 heads [Re: KillerBee] #681379
04/27/10 10:52 AM
04/27/10 10:52 AM
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U.S.S.A.
JohnRR Offline
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Quote:

If your on a tight budget I would stick with the 516's.
With bigger exhaust valves the 516's will flow very close to the 915's in stock form.
The experts claim if you max port them, the 915's flow a little better but spending big $$$ on stock steel heads for maximum performance is not money well spent with all the aluminum head choices out there.
I have a set of 516's with larger exhaust valves on my bone stock 1966 440. With a MP .509 cam and Holley 750 DP in a heavy street car it ran high 11's.




I'd be interested in seeing the flow sheets on a set of stock 516 vs. the 915 on the intake side since 915's have better intake ports than a 516.

Re: 516 vs 915 heads [Re: JohnRR] #681380
04/27/10 11:12 AM
04/27/10 11:12 AM
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N.E. Ohio
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KillerBee Offline
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Quote:

Quote:

If your on a tight budget I would stick with the 516's.
With bigger exhaust valves the 516's will flow very close to the 915's in stock form.
The experts claim if you max port them, the 915's flow a little better but spending big $$$ on stock steel heads for maximum performance is not money well spent with all the aluminum head choices out there.
I have a set of 516's with larger exhaust valves on my bone stock 1966 440. With a MP .509 cam and Holley 750 DP in a heavy street car it ran high 11's.




I'd be interested in seeing the flow sheets on a set of stock 516 vs. the 915 on the intake side since 915's have better intake ports than a 516.




John, many moons ago I believe Dwyane Porter flowed and then carved up a set of 516's and 915's.
IIRC the 516's with matching 1.74 exhaust valves installed flowed close to the 915's until he started really removing material. The 516 heads had a few humps and bends in the port passages that restricted flow and couldn't be removed without ruining the heads.
Obviously once the Edelbrocks heads came out spending big $$$ to go all out modifying factory steel heads was pointless.

Re: 516 vs 915 heads [Re: KillerBee] #681381
04/27/10 12:08 PM
04/27/10 12:08 PM
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New York
R/T1968R/T Offline
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This page has stock flow #s on these heads

http://users.erols.com/srweiss/tablehdc.htm

Re: 516 vs 915 heads [Re: R/T1968R/T] #681382
04/27/10 11:37 PM
04/27/10 11:37 PM
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oklahoma
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forphorty Offline
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According to Dwayne Porters flow bench, the 906 intake port flows much better than the 516. And as Dwayne mentions, the 906 and 915 port are basicly the same. http://www.moparts.org/Tech/Archive/bb/62.html

Re: 516 vs 915 heads [Re: Nick Mineau] #681383
04/28/10 10:37 AM
04/28/10 10:37 AM
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Brookeville, Md
Mr.Yuck Offline
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9.15's have bigger exhaust valoves and are worth more. however if the 516's are in better shape it might be a wash. my 516's have 2.14/1.81 valves, port work and flow very well. before you spend a nickle on either check out parts here or on other sites. you may be able to pick up a done set for around 4-500.


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Re: 516 vs 915 heads [Re: Mr.Yuck] #681384
04/29/10 09:15 AM
04/29/10 09:15 AM
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the frozen wastes...
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I'm chewing on this exact dilemma myself right now. I've got a nice, ready to go set ov 516's and a set ov 915 cores that need everything. I have a new set ov Manley 1.81 exhaust valves to use. I was just gonna have the machine shop cut the 516's for the big exhaust valves, clean up the ports, cut the guides a bit shorter for a bigger cam and call it a day.

But for an extra $300 i could have the same stuff done to the 915's (sell the 516's to make up some ov the $500 cost).

I'd feel better about porting the 915's as i have never done 516's, and i'm a little wary ov going too far. I've done 906 and 915 heads so far with good results.

So yeah, Hmmmm...

Re: 516 vs 915 heads [Re: Pale_Roader] #2880788
01/27/21 09:21 AM
01/27/21 09:21 AM
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North Sweden
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RT540 Offline
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Hi, old thread I found.

Have a good set from a -66 440 that I would like to have hardened seats pressed in for unleaded fuel. My machinist does not want to go up in valve diameter from 1,6" to 1.74". He thinks we will go in to water channels.

Anyone know which size valve seat he could use safely for these old 516 heads?

Re: 516 vs 915 heads [Re: Pale_Roader] #2880837
01/27/21 11:41 AM
01/27/21 11:41 AM
Joined: Jan 2003
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Brookeville, Md
Mr.Yuck Offline
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I had a set of 516's that had work, they flowed very well, They had 1.81, 1.74 valves...no issues. You might want to look online for a set of used iron heads that are done. You'd be surprised how cheap you can pick them up.


[IMG]http://i66.tinypic.com/pui5j.jpg[/IMG]
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Re: 516 vs 915 heads [Re: Mr.Yuck] #2880847
01/27/21 12:17 PM
01/27/21 12:17 PM
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Marion, South Carolina [><]
an8sec70cuda Offline
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There was a set of 516s needing to be rebuilt on one of the Mopar Facebook pages for sale earlier this week I believe for $100.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: 516 vs 915 heads [Re: an8sec70cuda] #2880910
01/27/21 02:22 PM
01/27/21 02:22 PM
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north of coder
moparx Offline
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maybe by the time you machined the castings for a 1.74 hardened exhaust seat insert, it would hit water, whereas if just machining 516's for a 1.74 valve, water wouldn't be hit ? shruggy
just from my experience BEATING on all the early stuff since the beginning of unleaded gas, exhaust valve recession in the head hasn't been a problem.
as a disclaimer, however, this hasn't been done with 10:1 and up race engines. brand X and Y have had way more problems with valve recession in my experience.
possibly the "heads were made of better material" statement is somewhat true ?
what is the cost of rebuilding iron heads these days ?
just a factory style rebuild with guide liners after the castings were crack checked of course.
or would that not be considered without adding hardened seats ?
beer

Re: 516 vs 915 heads [Re: moparx] #2880932
01/27/21 03:14 PM
01/27/21 03:14 PM
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North Sweden
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RT540 Offline
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Bought a complete 66 440 and will buy Edelbrock street for the short block. Cylinders look good. Will keep the original pistons. The 516 heads would go on a 383 in my D200-70 with 906 heads. To add som CR. Would have the heads cut to have a CR close to 9:5. We have 95octan here in Sweden as regular and 98 as premium fuel.

Maybe possible to run these without new seats? Total miles for a summer are limited to shorter trips, mostly moving stuff with the 8 foot bed.

Re: 516 vs 915 heads [Re: RT540] #2880961
01/27/21 04:10 PM
01/27/21 04:10 PM
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West Plains, MO
DrCharles Offline
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I have a pair of 516's that I had hardened seats and 1.74 exhaust valves installed. Bowl blend too. They don't leak. shruggy

Re: 516 vs 915 heads [Re: moparx] #2881107
01/27/21 09:47 PM
01/27/21 09:47 PM
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Sioux Falls,South Dakota
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fouronthefloor77 Offline
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I had some 906 heads rebuilt with hardened exhaust seats, With new valve seals and OEM valvesprings the tab was $674

Re: 516 vs 915 heads [Re: fouronthefloor77] #2881118
01/27/21 10:14 PM
01/27/21 10:14 PM
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Bend,OR USA
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Cab_Burge Offline
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Originally Posted by fouronthefloor77
I had some 906 heads rebuilt with hardened exhaust seats, With new valve seals and OEM valvesprings the tab was $674

he is in Sweden, probably harder to get them fix over their.
It might be cheaper, easier and better to buy a new set of aluminum heads like 440 source, Speedmasters or Pro Comps scope twocents


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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