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Big block cylinder head castings post

Posted By: Dunnuck Racing

Big block cylinder head castings post - 07/02/14 03:59 PM

I am starting this post to try and help clear up some confusion. There have been a few posts about various new big block heads and people seem to be confused on if they are all the same.
There are some new castings being sold by several builderst that are,members here, other castings by Procomp, and yet a different casting on EBay.
The heads the builders here have been working with I was told will be called " Sidewinder"heads.
Although they look similar to some popular heads, they have some well thought out upgrades in the castings
I was lucky enough to get a set of these castings to review and work with and thought I would share some results
I compared them to Edelbrock RPM out of the box heads and then used the same Edelbrock valves so the comparison would not be skewed by any trick valves changing flow.
First numbers are RPM heads untouched, second is a Sidewinder untouched.

Keith

Attached picture 8194827-NCM_0295-1.jpg
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 04:11 PM

With nothing more than a minor bowl blend and rich up of the valve seats flow was over 290 cfm.
Keith

Attached picture 8194836-NCM_0373-1.jpg
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 04:18 PM

Blended pic.

Keith

Attached picture 8194841-NCM_0374-1.jpg
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 04:24 PM

I then opened up the pushrod pinch, cleaned up the common wall, reshaped the roof and bowl area slightly to where I would normally push an RPM casting
Keith

Attached picture 8194848-NCM_0385-1.jpg
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 04:35 PM

Here is a comparison of a heavily ported RPM head versus what some basic work on the Sidewinder casting did for flow. I have half as much time in getting these castings to this point as I do when porting an RPM head.
I have no doubt there is more flow available in them but these received a level of work that will work great on a hot street engine they will be run on.
Thanks to Todd at CompWedge Engines for giving me an opportunity to look at these, I will be selling a few sets when all the testing is done.
I will keep people updated as the build is soon to be done and when it is I will do some dyno testing and compare these to nice set of Iron heads.
Keith

Attached picture 8194862-NCM_0382-1.jpg
Posted By: DGS

Re: Big block cylinder head castings post - 07/02/14 04:46 PM

Thanks Keith for posting the numbers on these heads! Looks like most improvement is at lower lift which should work well for a street engine.

Will you be posting the heads here (when you sell them) or do I need to e-mail you? I'm very interested in a ported set!

Stefan
Posted By: CTD5.9

Re: Big block cylinder head castings post - 07/02/14 04:57 PM

I'm not sure what's more exciting, these heads potential or that there are so many new castings for BB Mopar heads kicking around that there is confusion. Thanks for sharing this with us.
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 04:58 PM

I'm not positive on my pricing yet but these castings with and without porting will be available through CompWedge and Marsh Performance also. I think there will be a couple other dealers I'm just not sure who at this point.
I just wanted to get a few numbers out there to show how nice they are
The low and mid lift flow is really good on them and I'm sure with more work upper lift could be improved upon. I just didn't want to get to big of a cross section on this set as they are going in a heavy street car.
Keith
Posted By: 451Cuda

Re: Big block cylinder head castings post - 07/02/14 05:06 PM

Are the ports 440 sized? Raised at all? What cc chamber and runner?

Very interested for a mild 383 I have that currently has stock 516's.
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 05:37 PM

They are a standard.440 port size. I will have to pour a chamber and measure it but it looks to be around the same as an RPM head @ 84 cc. I will update when I know for sure.
Keith
Posted By: Copper Dart

Re: Big block cylinder head castings post - 07/02/14 06:16 PM

Posted By: dogdays

Re: Big block cylinder head castings post - 07/02/14 08:47 PM

Back in the day, even in Nebraska, 383s and 440s came with the same head castings. So all the ports were the same in any model year. There isn't any such thing as 440-sized or 383-sized ports. It's not like the chevy world.

Exception: In 1967 there was the 516 head and the 915 head, these were a little different in flow, and there were some 915s that had larger exhaust valves than other 915s.

There are probably some other examples that nit-pickers will focus on, so be it. One of the reasons that I like Mopars so much is that when you buy a 440 from a '69 New Yorker, it has the same head, crank, block and rods as the high-performance ones. You need to change camshaft, carburetor and exhaust manifolds. A double roller timing set and a heavy duty set of valve springs complete the transformation from regular performance to high performance.

R.
Posted By: pittsburghracer

Re: Big block cylinder head castings post - 07/02/14 09:03 PM

Thanks for the info. I may have to buy a set to play with.
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/02/14 09:41 PM

When somebody asks about port size, it is simply easier to say standard 440 port size, or Max wedge port size than it is to list every engine that came with a non Max Wedge port.

Keith
Posted By: DGS

Re: Big block cylinder head castings post - 07/30/14 04:55 PM

Hi Keith,

did you do any further testing/porting?
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 07/30/14 05:30 PM

Actually, I have a set on the porting bench right now. Todd from CompWedge Engines and I are doing a joint venture of sorts with them. I will have a nice street/ strip 440 going on my dyno in the near future with a set of these Sidewinder heads to see how everything works out.
I hope to get some e.t. numbers shortly thereafter.
I'll update everyone as soon as I have more to tell.
Keith
Posted By: sasquatch

Re: Big block cylinder head castings post - 07/31/14 06:14 AM

Thought you would like to see some internals.
INTAKE view...

Attached picture 8225157-Sidewinderintakecutaway.jpg
Posted By: sasquatch

Re: Big block cylinder head castings post - 07/31/14 06:15 AM

exhaust view....

Attached picture 8225161-Sidewinderexhaustcutaway.jpg
Posted By: 451Cuda

Re: Big block cylinder head castings post - 07/31/14 07:19 AM

Quote:

Back in the day, even in Nebraska, 383s and 440s came with the same head castings. So all the ports were the same in any model year. There isn't any such thing as 440-sized or 383-sized ports. It's not like the chevy world.

Exception: In 1967 there was the 516 head and the 915 head, these were a little different in flow, and there were some 915s that had larger exhaust valves than other 915s.

There are probably some other examples that nit-pickers will focus on, so be it. One of the reasons that I like Mopars so much is that when you buy a 440 from a '69 New Yorker, it has the same head, crank, block and rods as the high-performance ones. You need to change camshaft, carburetor and exhaust manifolds. A double roller timing set and a heavy duty set of valve springs complete the transformation from regular performance to high performance.

R.



You're preachin to the choir buddy. Learned all that trivia when I got into Mopars in the mid 80's.

It's just easier to type "440" ports than "standard wedge" ports...just like "max wedge" is abbreviated as "MW". There's no misunderstanding, just lazy typing
Posted By: 451Cuda

Re: Big block cylinder head castings post - 07/31/14 07:20 AM

Quote:

Actually, I have a set on the porting bench right now. Todd from CompWedge Engines and I are doing a joint venture of sorts with them. I will have a nice street/ strip 440 going on my dyno in the near future with a set of these Sidewinder heads to see how everything works out.
I hope to get some e.t. numbers shortly thereafter.
I'll update everyone as soon as I have more to tell.
Keith



Would love to hear how they run in the real world.
Posted By: JohnRR

Re: Big block cylinder head castings post - 07/31/14 03:32 PM

Quote:

When somebody asks about port size, it is simply easier to say standard 440 port size, or Max wedge port size than it is to list every engine that came with a non Max Wedge port.

Keith



That is what I think when someone asks about port size too.

Thanks for sharing the info.
Posted By: DGS

Re: Big block cylinder head castings post - 07/31/14 05:10 PM

Quote:

Thought you would like to see some internals.
INTAKE view...



They look pretty for sure..
Posted By: PorkyPig

Re: Big block cylinder head castings post - 08/01/14 04:08 PM

Next time one of you guys who are in contact w/ the Proheaders folks get to bring it up, how about they "find" a modern chamber design for this head. I don't get it why they go to the trouble to "fine tune" something and ignore the obvious technical throwback.

Or maybe come up with an "improved" Indy EZ-type head where the stupid lip in the intake runner is filled in so it can actually be used as a standard-port head.
Posted By: davenc

Re: Big block cylinder head castings post - 08/02/14 03:37 AM

The off the seat flow on the exhaust side is better on the E-RPM both in stock and ported form. Is this low flow area not as important on the exhaust side? Any thoughts on why the RPM is better in this area?
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 08/04/14 05:05 AM

The way the top cut transitions into the chamber is is a little different. I personally wouldn't worry about it if I was going to spec a cam for the combination. The low lift exhaust flow would make scavenging a little easier but could easily be made up for.
It wouldn't take much to make it match the RPM head there.
The Sidewinder could easily go bigger than I have done here but these are at a level I want for the street engine they go with.
Keith
Posted By: DGS

Re: Big block cylinder head castings post - 09/11/14 08:45 AM

Keith,
how's the testing coming along?
Posted By: sasquatch

Re: Big block cylinder head castings post - 09/12/14 06:05 AM

Ours is going fine. We have sold to date almost 20 sets with ZERO returns or problems. While we have several running at the moment we have not dynoed one yet but I should have that chance within the next two weeks. Nothing crazy but should be pretty sporty.
Todd
Posted By: DGS

Re: Big block cylinder head castings post - 09/12/14 11:09 AM

Quote:

Ours is going fine. We have sold to date almost 20 sets with ZERO returns or problems. While we have several running at the moment we have not dynoed one yet but I should have that chance within the next two weeks. Nothing crazy but should be pretty sporty.
Todd



Are these ported or ootb? Looking forward to seeing a few numbers
Posted By: Blown 68 R/T

Re: Big block cylinder head castings post - 09/14/14 08:20 PM

Keith/Todd

Been looking at these & ProMaxx, was wondering if they would hold up to a high spring pressure(750+) Procharger boosted application. Wondering if the weak link would be in the shaft mounts??
Posted By: DOUGG

Re: Big block cylinder head castings post - 09/15/14 03:10 AM

I bought a set (sidewinders) from marsh performance 3 weeks ago. Installed them on mild 383/ 9.5 comp,headers,750 holley, 478/494 lift cam(mild).WOW!!! Couldn't be be happier with my setup. 65 b-body/373 gears. This thing is now the beast I wanted it to be.
Posted By: sasquatch

Re: Big block cylinder head castings post - 09/15/14 04:25 AM

If you go back up this thread to the cutaways, I believe with a .060 cup or locator you could run 750 open pressure as far as the spring seat is concerned. That is a load on ANY aftermarket heads stands. You can look at the structure under them but that is a lot. You could helicoil them ( no big deal) and help a little. Heck even the VIctors had trouble with that with that kind of spring pressure.
Todd
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 09/15/14 03:04 PM

Sorry guys, I left Wednesday evening for Monster Mopar at Norwalk and haven't been on here much.
I have a test engine on the dyno with iron heads and will be doing some back to back testing soon.
Keith
Posted By: Blown 68 R/T

Re: Big block cylinder head castings post - 10/15/14 03:38 AM

Any updates on these Sidewinders Keith?
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 10/15/14 03:53 AM

I'm testing a few different combinations using the Sidewinder heads. First up was a back to back with a mild hydraulic cam versus 915 heads.
I'm testing them in ported form right now, with a couple different solid camshaft. I'll be posting results in the next day or so.
But I can say, so far so good! They are looking like a great option.
Keith

Attached picture 8300627-NCM_0554.JPG
Posted By: Dunnuck Racing

Re: Big block cylinder head castings post - 10/15/14 03:57 AM

In the next day or so, I will post some results up. I have been testing a few different combinations with them and am finishing up now with ported heads and a couple of solid cams. So far they are looking like a real nice option!
Keith

Attached picture 8300633-NCM_0554.JPG
Posted By: gpuller

Re: Big block cylinder head castings post - 11/07/14 10:11 PM

Are these angled plug heads? Any troubles with ordinary headers fitting?
Posted By: 451Cuda

Re: Big block cylinder head castings post - 02/07/15 08:52 PM

Quote:

In the next day or so, I will post some results up. I have been testing a few different combinations with them and am finishing up now with ported heads and a couple of solid cams. So far they are looking like a real nice option!
Keith



Any more updates on these heads? Really interested.
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