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Old 05-07-2012, 02:16 AM   #1 (permalink)
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Dyna Ryda is reading this now saying WTF is this?
Anybody using MVA heads on a 107"?

Have a friend with a 107" stroker (not all bore), S&S 585 and hpi 55 TB. It has stock heads with 1.90 intake ported and cut down to 84cc. After I changed my heads to GMR stage 3, I showed him my tail lights a few times, now he wants me to change his heads. So I'm wondering if a set of MVA's can be cut down to 84cc and how they would work with his motor??? Any other ideas for heads?
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Old 05-07-2012, 08:16 PM   #2 (permalink)
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Originally Posted by Dyna Ryda View Post
Have a friend with a 107" stroker (not all bore), S&S 585 and hpi 55 TB. It has stock heads with 1.90 intake ported and cut down to 84cc. After I changed my heads to GMR stage 3, I showed him my tail lights a few times, now he wants me to change his heads. So I'm wondering if a set of MVA's can be cut down to 84cc and how they would work with his motor??? Any other ideas for heads?
The last set I checked came in at 93 cc's, that means a lot of meat to get them down to 84, I also think they are overkill for a street 107.
Get some more of the stage 3 stuff for your buddy, he will be much happier with the driveability, or he could just jump up to the cast and show you his tail lights, but then you would have to bump yours again. It is a vicious cycle that never ends but keeps performance shops in business.
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Old 05-07-2012, 08:24 PM   #3 (permalink)
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The last set I checked came in at 93 cc's, that means a lot of meat to get them down to 84, I also think they are overkill for a street 107.
Get some more of the stage 3 stuff for your buddy, he will be much happier with the driveability, or he could just jump up to the cast and show you his tail lights, but then you would have to bump yours again. It is a vicious cycle that never ends but keeps performance shops in business.
I checked some recently and they too were around 95cc, iirc. When I read this, I also thought they were a touch too much for a 107. We've found that the MVA's make a great bolt-on head for 117's that are going for a mild build.
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Old 05-07-2012, 09:51 PM   #4 (permalink)
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The last set I checked came in at 93 cc's, that means a lot of meat to get them down to 84, I also think they are overkill for a street 107.
Get some more of the stage 3 stuff for your buddy, he will be much happier with the driveability, or he could just jump up to the cast and show you his tail lights, but then you would have to bump yours again. It is a vicious cycle that never ends but keeps performance shops in business.
Thanks, I was kinda thinking they might be too big, but that's what makes this place great to ask questions. I also wasn't sure how big the chambers were. I come from a motocross racing/wrenching back ground where bigger is better, but that's racing at high rpm's.

Your right about the vicious cycle, my bike ran really good with the 1.90 ported heads, made about 110 tq and a little over 100 hp. Most people would be happy with that but I wasn't, I felt the need to spend $1g on a set of heads. It was totally worth it.
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Old 05-07-2012, 09:59 PM   #5 (permalink)
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Maybe a larger valve in a stock head? What do your friend's heads flow now 'Ryda? What's his exhaust? They sound very similar to mine. Wish my tail lights and your tail lights were on the same "island"! LOL



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Old 05-08-2012, 10:53 AM   #6 (permalink)
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Dyna Ryda is reading this now saying WTF is this?
Not sure what flow numbers his heads have. They were first ported back in '07 by a performance shop here. They used stock valves, so when I built it into a 107" I had a 1.90 intake valve cut in and then I opened up the intake ports to match. It runs really good, very strong. I had him take it by the HD shop here and have it checked out on their dyno just to make sure the t-max was right with the AFR. I don't have his dyno sheet but I did see it, 107 hp and 117 tq. It stopped making HP around 5600. So I'm pretty sure the heads are choking it off.

1.90 is the biggest a stock valve seat can be cut. If the seats are changed you can go bigger. Mine are 1.940 intake and 1.625 exhaust, big difference in the upper rpm range. Probably just gonna order him a set of the stage 3 heads that I have. I'm just trying to think of something different.
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Old 05-08-2012, 02:38 PM   #7 (permalink)
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Change the pistons and heads. Use a 20 deg dome piston and set the compression where you want it.
If you really want him to show you his taillight
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Old 05-08-2012, 08:34 PM   #8 (permalink)
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Originally Posted by Dyna Ryda View Post
Have a friend with a 107" stroker (not all bore), S&S 585 and hpi 55 TB. It has stock heads with 1.90 intake ported and cut down to 84cc. After I changed my heads to GMR stage 3, I showed him my tail lights a few times, now he wants me to change his heads. So I'm wondering if a set of MVA's can be cut down to 84cc and how they would work with his motor??? Any other ideas for heads?
A shop in CT. did a 103 with MVA heads warmed over by Paul Matyka with just a T-Man 625 cam's, 58mm. se tb done up from HPI, over 120/120. Had 110 ft. lbs at like 2700.
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Old 05-08-2012, 09:12 PM   #9 (permalink)
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A shop in CT. did a 103 with MVA heads warmed over by Paul Matyka with just a T-Man 625 cam's, 58mm. se tb done up from HPI, over 120/120. Had 110 ft. lbs at like 2700.
That's impressive!

If the MVA's come at 93cc they would need to be fly cut about .065-.070 to get to 84cc and keep the CR at 10.5, anyone ever cut a head down that far?
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Old 05-08-2012, 09:43 PM   #10 (permalink)
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A shop in CT. did a 103 with MVA heads warmed over by Paul Matyka with just a T-Man 625 cam's, 58mm. se tb done up from HPI, over 120/120. Had 110 ft. lbs at like 2700.
I would totally agree that is darn impressive! But I suspect they have 93 octane out there because of those TQ numbers and not our Commiefornia 91 octane.

I'm guessing they are running a lot of compression there.

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Old 05-08-2012, 10:39 PM   #11 (permalink)
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The thread is on HTT. The bike had on the new Thunderheader X series, for big ci. engines.
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Old 05-08-2012, 11:00 PM   #12 (permalink)
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Some other heads to consider are the Kuryakyn Wild Thing Heads. Mike Rolland made 142hp/133tq on a 103 with all his goodies. There WT 46 cams, 10.75 comp, Power Cell Exhaust, Crusher Mellow Mufflers, WT 57mm. tb.
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Old 05-08-2012, 11:15 PM   #13 (permalink)
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I would totally agree that is darn impressive! But I suspect they have 93 octane out there because of those TQ numbers and not our Commiefornia 91 octane.

I'm guessing they are running a lot of compression there.

-Tutt
Don't be scared of compression, we ain't. My bike is 10.5 and has a ccp of 200. His 107 is also 10.5 with a ccp of 195. Tight squish and good tune will take care of pinging.
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Old 05-08-2012, 11:45 PM   #14 (permalink)
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Cowboy Tutt, we get 93 octane out east. That's what I run in my bikes.
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Old 05-09-2012, 12:19 AM   #15 (permalink)
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Dyna Ryda, same on my build! 10.5-10.6 static. The corrected seems to be an area of dispute depending on the calculator you use. Last I heard from my engine builder Earl Burly I'm at 9.5 or 9.6 corrected. Hey Man, when did you become so politically correct? I'm your friend but I miss the good old days of you sending me pics of Velvet Touch lifters? Your really starting to bore me! I am not so thin skinned and neither are you.

If you ever need a place to stay in Northern CA, you got it. If you ever need to see what a lowly Dyna can do with a modest 103 and a good suspension capable of good lean angles and causing cupping on the sidewalls from hard corner exits with lots of TQ, I'm your guy!

I'm your friend. Please stop being so gosh darned "sensitive"! Yawn! LOL

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