So I did a little research into DME"s Mega Sphere kit and to be honest For the amount of time and money that goes into this kind of build in a 107" motor I would have thought better numbers.. Don't get me wrong the torque curve on the motor is long with lots of area under it and am sure it pulls very well but you need to consider the machining that goes into this build. I myself currently have a 96" Evo build that is very similar and will post pics of both heads and dyno sheets of each build keep in mind both builds are with 30* pistons. Dave uses CP pistons and my build was with Axtell pistons..

Lets take a look at the heads so you can see what I mean. First one is DME's and second pic is my Axtell's, All machining on my Cylinder heads and piston work was done @HilsideMotorcycle and Machine... To be able to use the 30* pistons you have to reconfigure the combustion chamber and move the valve pockets deeper into the head. You also nee to machine the combustion chamber properly to keep the swirling of air fuel mixture for maximum potential power.. My heads cots $1500 to set up to the pistons and as always you need to set the static compression to the cam and attempt a minimum of 200 ccp (for street purposes). I can imagine that the polished heads of DME is a bit more money.




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For those of you that have not seen a 30* piston here is the Axtell piston that I used in my build.. This was not the final profile because the piston as well needed to be milled to fit the head and get the proper static compression for the cam..



The end results are the 2 dyno sheets.. Both very good builds and both shops highly recommended by Many. I'm not here to slam anyone but am trying to enlighten those that don't understand these types of builds and what's really is involved.. I love my 96"er in my Fatboy and would someday hope to get it to a track. I have done many tests hits on local roads where I can record my runs with a Wego III and the bike is definitely a solid 12.0 and very very possibly high elevens..

 

For the amount of money for that 89” stroker in that Mackie build easily could have dropped 111 in. But I’m a evo guy so I get it plus he probably has money to burn. There’s no doubt Hillside knows his stuff as many others do. In my area we have a local guy who does tons builds and uses Jon Sachs for head work for many years. He built my 98” stroker in my 90 which absolutely rips and smooth as a butter. Took awhile to get my clutch good but all is well now. Ya gotta admit those heads by both guys sure are Purdy. 👍🏻

 

Have used Sachs for years, haven't heard or seen anything from John in a few years, hope his is fine because the guy is a common man genius.

 

My bud ( Leon’s Performance Engines ) just sent him couple sets twin cam and evo heads. He’s still going strong. I hope I’m that fit at his age and I’m 66 lol. And yes his heads make power he’s been doing our heads for years. Hot **** to…

 

Probably right about the cost.. A Darkhorse crank and those heads alone were probably 4k.... I'm sure your 98"er performed very well...

 

Stock head vs modified head easy explanation and look.

 

After watching the video Jerry Branch legacy is the only thing comes to mind.

Mackie has survived over the years at his craft without much advertisement, his cams work well without the hard shock to the valve train, cam numbers don't follow the normal pattern either, early intake valve closing with larger duration is Mackie tendencies.

 

For those into cams or thinking that way, here's something that might be helpful.

 

Definitely the old school way of doing it.. My friend John Zannetti who balance my crank thinks the same way and recommended the 3Sun Mars EB2112A - 27 51 58 22 258 260 49 102 108 105.0 0.560 0.560 0.240 0.203. They don't really believe in hi lift but definitely longer duration.. at 3500 rpm it feels like a 30 shot of Nitrous..

 

Friend has my DM580 in a compressioned 80" softail, about the same way, when the engine hits, the bike can embarrass bigger cubes. Has a 42 intake closing helping it pull through normal riding but has duration numbers like mentioned above and old school.
Don't know if S&S cams fall in modern or old school era but a S&S did soften my big cube giving it good street manors at idle and runability, with age enjoying those area's over the violent hit.