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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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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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
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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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Joined: Jan 2003
Posts: 6,497 N.E. Ohio
KillerBee
master
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master
Joined: Jan 2003
Posts: 6,497
N.E. Ohio
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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 $$$ on stock steel heads for maximum performance is not money well spent with all the aluminum head choices out there. I have a set of 516's with larger exhaust valves on my bone stock 1966 440. With a MP .509 cam and Holley 750 DP in a heavy street car it ran high 11's.
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Re: 516 vs 915 heads
[Re: Nick Mineau]
#681377
04/27/10 12:06 AM
04/27/10 12:06 AM
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Joined: Jan 2003
Posts: 6,497 N.E. Ohio
KillerBee
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master
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N.E. Ohio
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Quote:
what size valves did you run. any porting. i would be very happy with those times im running a 3300 lb duster
I went from the smaller 1.6 exhaust to the (newer stock) 1.74 size. Intake valves are stock size. I did a little backyard smoothing of the ports, I didn't re-shape anything or remove any material, I might have made it slower. Shortblock is a 40k original mile 1966 440, never touched, bone stock. Heavy all steel street Challenger(less fiberglass T/A hood). Hemi 4 speed with 4.10 rear gear.
I would think 11's would be real easy in a lighter A body as long as you get it tuned and dialed in right.
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Re: 516 vs 915 heads
[Re: KillerBee]
#681379
04/27/10 10:52 AM
04/27/10 10:52 AM
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Joined: Jan 2003
Posts: 74,904 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,904
U.S.S.A.
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Quote:
If your on a tight budget I would stick with the 516's. With bigger exhaust valves the 516's will flow very close to the 915's in stock form. The experts claim if you max port them, the 915's flow a little better but spending big $$$ 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.
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Re: 516 vs 915 heads
[Re: JohnRR]
#681380
04/27/10 11:12 AM
04/27/10 11:12 AM
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Joined: Jan 2003
Posts: 6,497 N.E. Ohio
KillerBee
master
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master
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Posts: 6,497
N.E. Ohio
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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.
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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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Joined: Jan 2003
Posts: 13,318 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,318
Marion, South Carolina [><]
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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
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Re: 516 vs 915 heads
[Re: an8sec70cuda]
#2880910
01/27/21 02:22 PM
01/27/21 02:22 PM
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Joined: Sep 2003
Posts: 19,237 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,237
north of coder
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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 ? 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 ?
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Re: 516 vs 915 heads
[Re: fouronthefloor77]
#2881118
01/27/21 10:14 PM
01/27/21 10:14 PM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
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I Win
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Posts: 43,007
Bend,OR USA
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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 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
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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