Anybody using MVA heads on a 107"? - Page 2 : V-Twin Forum: Harley Davidson Forums
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Old 05-09-2012, 06:01 AM   #16 (permalink)
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Originally Posted by Dyna Ryda View Post
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?
i've been running heads with quite a bit cut off, almost to the fin. the only hurdle to speak of is the intake fitment. and of course the valve clearances.
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Old 05-09-2012, 06:39 AM   #17 (permalink)
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Quote:
Originally Posted by Dyna Ryda View Post
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?
No because they cant be cut that far.
If you use them out of the box. That means no chamber work. You might get 91cc's. 93 cc is the norm with the chamber work.
So dont fight it,they cant even be cut far enought on a 120 r to get to a true 10.5 compression with flat tops.
If you want to use them in a 107 you need a piston that gets you where you need to be. Then rock and roll.
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Old 05-09-2012, 11:51 AM   #18 (permalink)
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Originally Posted by strokerjlk View Post
No because they cant be cut that far.
If you use them out of the box. That means no chamber work. You might get 91cc's. 93 cc is the norm with the chamber work.
So dont fight it,they cant even be cut far enought on a 120 r to get to a true 10.5 compression with flat tops.
If you want to use them in a 107 you need a piston that gets you where you need to be. Then rock and roll.
CP makes +3 and +6 for the 107. Wouldn't one of those pistons do the trick to make the heads useable in that application?
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Old 05-09-2012, 06:33 PM   #19 (permalink)
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CP makes +3 and +6 for the 107. Wouldn't one of those pistons do the trick to make the heads useable in that application?
Yes that would have worked, but the motor only has a few thousand miles on it. It has flat top CP pistons in it now, I really don't want to pull those out.

I have a few emails out to different head guys and made a few calls (T-man) just waiting to figure out who to send the heads to. I have 3 or 4 stock sets just sitting in my shop.
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Old 05-09-2012, 07:18 PM   #20 (permalink)
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Nope won't happen
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Old 05-09-2012, 07:38 PM   #21 (permalink)
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Theres your answer, nw guy4 fun nailed it...I totally agree....aint happening with those heads.

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Old 11-12-2012, 05:17 AM   #22 (permalink)
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Originally Posted by C-Cat View Post
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.
Do you have a link or anymore info on this build? I've been searching. Can't find anything.
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Old 11-12-2012, 06:59 AM   #23 (permalink)
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.....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.
I don't understand...

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