Cylinder head dyno shoot out

Any interest in a dyno shoot out of a few popular SBM heads?

  • Yes

    Votes: 88 97.8%
  • No

    Votes: 2 2.2%

  • Total voters
    90
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Ok guys, to catch this up, the displacement issue has been settled, it will be a 4" stroke combo. I dug around in my core pile and found a early 71 360 block that was std bore. Its currently in the ampro for baking and blasting. It will get the full treatment, including bushing the lifter bores, and all the other tricks. I am going to do standard LA heads as a group first, then possible the offset rocker stuff later. I need to keep the same intake, carburetor and headers for all the tests. A number of great members have reached out with ideas, and offered heads for testing, I will keep this updated as we go. Thanks for all of you guys input!
 
Ok guys, to catch this up, the displacement issue has been settled, it will be a 4" stroke combo. I dug around in my core pile and found a early 71 360 block that was std bore. Its currently in the ampro for baking and blasting. It will get the full treatment, including bushing the lifter bores, and all the other tricks. I am going to do standard LA heads as a group first, then possible the offset rocker stuff later. I need to keep the same intake, carburetor and headers for all the tests. A number of great members have reached out with ideas, and offered heads for testing, I will keep this updated as we go. Thanks for all of you guys input!
NC Engine Builder, thanks for doing this. When you get to it send me a PM I may have a set of ported W5's and a Indy intake I could loan when you get to the offset rocker heads. I also have a set Ritter W7's but the intake is ootb and will need porting.
 
NC Engine Builder, thanks for doing this. When you get to it send me a PM I may have a set of ported W5's and a Indy intake I could loan when you get to the offset rocker heads. I also have a set Ritter W7's but the intake is ootb and will need porting.
Will do, but it will be exponentially more difficult if we do a offset rocker head shootout. I'm not ruling it out, but gonna see how the std port shootout goes first.
 
Ok guys, to catch this up, the displacement issue has been settled, it will be a 4" stroke combo. I dug around in my core pile and found a early 71 360 block that was std bore. Its currently in the ampro for baking and blasting. It will get the full treatment, including bushing the lifter bores, and all the other tricks. I am going to do standard LA heads as a group first, then possible the offset rocker stuff later. I need to keep the same intake, carburetor and headers for all the tests. A number of great members have reached out with ideas, and offered heads for testing, I will keep this updated as we go. Thanks for all of you guys input!

This is awesome! Same day same shortblock comparison of different heads would be super useful. Would be curious if the test group will include some stock iron heads. I think a lot of people are curious what a difference going to an aftermarket head is with the same everything else.
 
This is awesome! Same day same shortblock comparison of different heads would be super useful. Would be curious if the test group will include some stock iron heads. I think a lot of people are curious what a difference going to an aftermarket head is with the same everything else.
I'm not sure on a stock iron head. Those really dont flow enough for a stockish 340/360 build
 
I'm not sure on a stock iron head. Those really dont flow enough for a stockish 340/360 build
Right, I agree they don't, I just think it would be interesting to see the difference because that is what most people are taking off to put one of these other options on.
 
Not throwing 302's in mix ? I hear great things about them :)
 
It would be nice to throw one of the stock 340/360/magnum heads into the mix to see the gain/baseline over stock but get might too much pain in the *** to do so.
 
It would be nice to throw one of the stock 340/360/magnum heads into the mix to see the gain/baseline over stock but get might too much pain in the *** to do so.

While I think that’s a great idea, NC’s saying no to it and with good reason. But I’m sure, feel free to ask and pay for some dyno time to know this interesting question answered.
 
Ok guys, to catch this up, the displacement issue has been settled, it will be a 4" stroke combo. I dug around in my core pile and found a early 71 360 block that was std bore. Its currently in the ampro for baking and blasting. It will get the full treatment, including bushing the lifter bores, and all the other tricks. I am going to do standard LA heads as a group first, then possible the offset rocker stuff later. I need to keep the same intake, carburetor and headers for all the tests. A number of great members have reached out with ideas, and offered heads for testing, I will keep this updated as we go. Thanks for all of you guys input!
I think that's probably best, because the stroker is such a popular combo. Also, please do us all a favor. Don't let some azzhole get you pissed off again and leave like you did before. You're a great asset to this community and we all appreciate you....well most of us. .....and there are more of "US" than there are of "THEM", so piss on um. This is gonna be good.
 
I think that's probably best, because the stroker is such a popular combo. Also, please do us all a favor. Don't let some azzhole get you pissed off again and leave like you did before. You're a great asset to this community and we all appreciate you....well most of us. .....and there are more of "US" than there are of "THEM", so piss on um. This is gonna be good.

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That’s a lot of percents.
:rofl:
 
Am I missing something ? People are causing problems in this thread ? Hope not really like to see the out come of this dyno head shootout.
 
Am I missing something ? People are causing problems in this thread ? Hope not really like to see the out come of this dyno head shootout.
No. I was referring to an incident in the past. All is well here.
 
If the build plan involves a roller cam stout enough to put the power level into the mid-500 mark, that’s going to require a fairly stout set of springs.
The type of springs that aren’t easily retrofitted onto oe or (especially)magnum heads.

I know if I were doing the test, it just wouldn’t happen.

The argument that “most people” are swapping from oe heads to aftermarket is one I don’t necessarily agree with.
Particularly if the build is a stroker making over 500hp.
Imo, these are more often than not fresh builds that will be getting new heads right from the start.
 
I think some would find it interesting what a stock set could do, but if it impractical or just waste of $$ to test makes sense not too, I imagine everyone is ok without it.
 
If someone had a suitable set of oe la heads that are truly “ready to run” for this application, that they’d offer up for the cause, that might make it worthwhile.
But to have to build a set of heads for the test, then I think the time and $$$ would be better utilized on something else.
 
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Brother, if I machined and assembled a slant six, I couldn't GIVE the shortblock away for free when I was done!
Sure you could, I need one for my e-body project. Plenty of slanters are on the lookout for a good ported/updated head too, no one seems to do them
 
Honestly the only reason to run a stock head on 400 inches is to get a baseline. We pretty much know at this point how bad they are.
 
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