I posted this once and I got no response. Either no one knows anything about these heads or few people have them. See below.

Getting ready to purchase a 2011 FXDWG with MVA heads akready installed in two days. The bike (online) looks like a performance package has been installed with intake, exhaust, super tuner, and a cam. Anyone have these heads, and if so the next question is do you have any maintenance issues?????? What sort of cams are recommended with this 211?

I rode 10k last year which isnt a lot, but I dont like seeing my mechanic for anything except a cold beer if you know what I mean. I would like to know any reviews/problems from anyone using these heads, and are they really worth the money?

Meanwhile I am looking online at all the forums trying to find as much information as I can. The bike still has a factory warranty, but the dealer stated that he wouldnt be able to do an extended warranty. WTF not?

Thanks.

 

The MVA heads are oval chambers, big valves, 95cc chamber volume (compared to 85cc-86cc for the OEM heads) and meant for 110" and/or 113" builds. Installing those heads on a 96" or even a 103"er is a bad combination and will turn a stock bike inot a low compression turd. If those heads were installed as part of a Stage IV 113" kit, no problem. There isn't a cam that really matches up with those heads on a 96"/103" engine with flat top pistons. There are several that match up with the MVA heads in a 110" or 113" engine; the H-D cam that is in the Stage IV 113" package is the 266E.

I find it hard to believe that the MVA heads were installet on a 96"/103" engine. You need to get the whole story/details of the build.

 

Vtwin forum also had a 103 build

https://www.hdforums.com/forum/engin...mva-heads.html
Yup 103, stage 2, with a cam(sorry details on the cam to come)super tuner, SE intake, and all was performed at a HD dealership. The exhaust is a 2-1 with a long pipe V&H. The dyno sheet is forth coming once they find it. I rode it, and its got some scat!

Worst comes to worst I have a good springboard at a great price for a later - stage 4 hot rod.

 

Here's a table that shows how they flow (CFM) compared to other Screamin Eagle options ....



If you look at the Screamin Eagle catalog online, you should be able to get about as much info as is available (or pick up a hard copy of the catalog at the parts desk of your local dealership) ....

With a bigger combustion chamber, it will drop the compression ratio from what it would otherwise be with stock heads (or heads with the same combustion chamber volume) ... the loss of compression may or may not have been made up with the increased flow characteristics ...

Bottom line ... as djl indicates, your motor is not necessarily reaching its potential through the use of these particular heads ...

R/
'Chop

 

Thanks chop, found out the pistons are high compression, but I still dont have the details on the cam yet. Its also got the automatic compression release so definitely more slam than stock. I will pick up the bike tomorrow with a dyna sheet and all the info. Its a safe build and should last without issues later on according to the service guy I spoke with, and much better than stock - but not a full blown beast. I can live with that for now. Thanks for all the info from the only two replies.......

 

Domed pistons would work better with the heads ... I'd be interested in what your static and dynamic compression ratios are ... also what kind of cylinder pressure it makes (psi) ....

Once you know what you have (and how well it is working for you) you can decide where to go from there ....

Good luck and welcome aboard ....

R/
'Chop

 

Those heads on a 103 with the proper pistons will work pretty darn well. My 103" MVA headed set up with a camset that has a 42 IVC and 10.5 pistons(they give 10.5 with the 95cc chambers in the heads) and a .030 hg, cranks at 195. I have the acrs fitted. I also have the 58mm tb. Tuned right, it runs better than anyone would think. A friend had the 110+ heads(same casting) and flat tops, total junk. Find out what has been done first. The words high compression pistons mean nothing, gotta have the pn for compatibility with the heads to see what comp you have.

 

Did the 2011 FXWDG come standard with a 103 motor? I keep checking online, and I see that the 2012 has a 103 but looking at 2010 and 2011 I see a 96 CI motor? Can anyone clarify? If it did come standard with a 96 then that just means I got an even better deal on the bike with the 103 thats in there!

As far as the pistons go, the dealership cant seem to find the paperwork, but all I know is that the front wheel has almost come off the ground a few times and the bike seems faster than my sportster. If my hands were top slip off the grips(laughing).....anyway I am happy with what I have and the bike was a STEAL!

 

they were stock with a 96" motor.

 

Glad for you man its always good when a plan comes together