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107ci vs porting heads

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Old Jan 18, 2011 | 03:07 PM
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Default 107ci vs porting heads
I have a 103ci in my 2011 RG with 555 Woods cam, Thunderheader, SE tuner and air cleaner. I can get a 107 kit for $600 , plus local labor and dyno OR port and polish the heads with a well known builder for $1400 (labor included) plus dyno. What would give me more HP cheaper plus reliablility?

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Old Jan 18, 2011 | 03:42 PM
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I'd have the heads done to match the cam. I think that will net you more gains than the slight increase in displacement.
 
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Old Jan 18, 2011 | 04:56 PM
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Your already starving your cylinders by not porting the heads to match the cam. Bore it bigger and it's starving even more! I'd say porting will make it run right!
 
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Old Jan 18, 2011 | 05:38 PM
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tootal
I hear ya, but $1400 plus dyno is a lot $ . But he is a well know builder. What do you or anyone else know about sending my heads to one of these" heads only" businesses(like Headquarters) for $400-500 plus local labor?
 
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Old Jan 18, 2011 | 06:36 PM
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I'd also vote head work along with a .030 head gasket. But geez, I think you could get some very nice head work done for less than half the price??
 
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Old Jan 18, 2011 | 06:38 PM
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youll want to do headwork too
 
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Old Jan 18, 2011 | 09:26 PM
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Originally Posted by devilfishlane
tootal
I hear ya, but $1400 plus dyno is a lot $ . But he is a well know builder. What do you or anyone else know about sending my heads to one of these" heads only" businesses(like Headquarters) for $400-500 plus local labor?
Call Don Dorrman (Dewey's Heads) in the Tacoma area; 253 691-5893. Don had a velocity port, head blue print package that is pretty reasonable. He is a builder and porter, very knowledgeable, has been working on Harleys for many years and easy to talk to.

Oh yeah, another vote for porting.
 
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Old Jan 18, 2011 | 10:44 PM
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I vote head work too. ive looked at many posted dynos on 103s and 107s many are very close in numbers, id just improve on what you've already got.
 
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Old Jan 18, 2011 | 10:58 PM
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I think you would see more from headwork and having the compression set right. I didn't even go bigger and my little 96" runs pretty sweet.
 
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Old Jan 19, 2011 | 08:47 AM
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Originally Posted by devilfishlane
tootal
I hear ya, but $1400 plus dyno is a lot $ . But he is a well know builder. What do you or anyone else know about sending my heads to one of these" heads only" businesses(like Headquarters) for $400-500 plus local labor?
Head Quarters isn't a "heads only" business, and they'll be more than $400-$500.
 
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