taco eater :
Jonathan Feldman from Oakland, CA United States
Kinda a weird one. Seems like its gonna be the game changer but also has many flaws. I had it on a av7 airsal 47mm but ended up running a different head. Had some issues with the decomp passageway not being straight so the decomp valve ended up sitting cock eyed on the head and not sealing correctly.. yikes.
The good: spark plug access is very nice compared to stock / big ol juicy fins.
The bad: shitty casting / out of the box very high compression. I imagine it would need the combustion chamber hogged out to really work correctly with any 70cc kit.
But yeah idk man. I spent a lot of time tryna get it set up all nice and in the end I didnt really feel like it was worth it. Maybe you'll crack the davinci and figure out what this guy is good for? Hit me up bish.
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I'll let you know how it works when I get a decomp
May 13, 2017
taco eater :
Ashley ackley from minneapolis, MN United States
How does this not come with a lever? How does this not come with a gasket?!?
EDIT TREATS : No brand name aftermarket 103 or MBK head comes with a decomp assembly. No head includes a head gasket that we sell except for a few O ring heads that use a special O ring. Manufacturers just do not include these parts. so...there ya go!
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Lots of work ahead
July 11, 2016
taco eater :
Zac Kortz from Otsego, MI United States
Like others, I am disappointed with the combustion chamber. I expect more from Polini. It took quite a lot of work to remove the pitting.
That being said, this is really the only readily accessible Moby head with decomp for larger kits.
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Polini, why?
May 3, 2013
taco eater :
Max Johnson from New Bedford, MA United States
I think 90% of the features of this head are Stellar. Spark plug is easier to access, fins are better positioned, aluminum quality is better.
The Decomp hole needs to be lapped sometimes, that's okay. The head mating surface too, but we knew that.
The combustion chamber though... Polini, you're gonna skimp on us Here?
The Squish surface is provided As Cast. It has high spots, pits, and an Obscene blend radius. But worst for some of us, it was designed for Very nearly flat-topped pistons.
On an Airsal kit, it has a Negative Squish angle. Bad Juju. Get in there with a dremel and fix that angle (Use a piston and a sharpie to make sure you're on the right track) and cut the Combustion 'tub' out around the spark plug to relax the compression and give a better blend radius (Or None, like me)
Running a Doppler? Relax that Compression ratio a LOT.
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Super nice!!
December 4, 2012
taco eater :
Adam Pereira from castro valley, CA United States
Nice combustion chamber...HUGE fins!!!! (seriously.... like twice the surface area of a stock head) Dropped my temps by many many degrees F!!! If ya get a kit...get this too!!!!!
Potential banger? 
Polini, why? 
Super nice!!