Dan Vance Racing
Twin Cam Heads

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At Dan Vance Racing we offer custom high performance cylinder head and engine modifications for Harley Davidson motorcyles.  We have performance kits for every riding style.  We can provide torque and horsepower increases in any or all RPM ranges.

Cylinder Head Porting & Flowing Process

                                                                       Twin Cam Power

Raised Port Technology

starting at  $795.00

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     Cylinder head porting is the manipulation of the port to increase flow and velocity of the air to interact with the cam and compression that the motor has in the various rpm ranges. There are many ways to port cylinder heads depending on the other contributing factors like compression, cam choice, gearing and intended use of the motor ie."where do you want the power ?" Some riders like top end power, like Nascar while others prefer low end torque like NHRA drag racing.
     The port in your heads has the ability to serve both desires. It's up to you where want your power. When you decide what rpm range you ride in and where you want the most power, I can port the heads to meet these requirements. If you are building a street motor for daily use, then you may want the power to come on in lower rpm ranges as you cruise through the gears and occasionally go to WOT (wide open throttle) for the rush. In this case the power I provide will happen when you want more torque to push you when you are passing other vehicles or racing with your friends on a straight away. This kit will provide an instant throttle response !!
     If you want the kind of power that is always at WOT, like a drag or street racer or dyno wars, then I can port the heads to have the power come on in the higher rpm ranges. Either way, both the torque and horsepower curves will increase.
     When I know what you want I will blend and cut the ports so the most air is delivered at the correct time. When the heads flow what I want, I go to the welding booth and work on the floor of the port to increase the velocity of the incoming air. This is a double whammy. Not only does the welding increase the velocity of the air it actually increases the amount of air being inhaled by the motor. 
     Now that the heads are flowing the numbers you want, it's time to pick out the cam. We will discuss this and choose a cam that compliments your riding style. That's where I can be of help in choosing the cam that's right for you.
     There are many choices that will change the outcome of these packages, some might make it better, some might not. I can only attest to what I have used and know the results. I am always willing to discuss suggestions on parts that will compliment the kit you have chosen. This will result in the best performing kit for you and your motorcycle.
     I am always learning right along with you and try my best to update my information and skills as new products are introduced on the market. So please feel free to contact me at the email address below.
   
     I appreciate all your questions and suggestions !!

If you would like me to provide you with additional services to compliment these suggested packages, I have listed some options below that you can choose to have done.

As with all performance parts there different levels of performance for different riders and their needs. I have listed some of these kits for you to consider.

My basic kit includes welded and resized intake port.  I also install a new 1.900 intake valve, 4 new valve guides, hone the exhaust guides to your existing exhaust valve, check valve spring pressure for your cam choice and clean and assemble the heads to be ready to be installed.  This is a great kit for most riders. It'll give you more power in all the rpm ranges, make the bike smoother and just more fun to ride.      This head with the suggested parts will give you 100 torque and 95 hp, and cost     $795.00

This kit works well with the andrews 26, 37, 54 or the Woods #6 or 6H

A suggested kit of: raised port heads,  88 to 95" big bore kit,  andrews 37 cams, complete top end MLS gasket kit and a set of compression releases for the low cost of  $1595.00  All work to be done on your parts.  I do have an exchange program that is explained on another page.

This kit works well with a stock throttle body or a carb.  The enclosed dyno sheet shows the results.

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Some Available Options :
  • Compression releases: machining and installation of releases.    
  • Milling heads for desired compression.                                          
  • CC heads.                                                                                    
  • Install new valve seat                                                                   
  • Port manifold                                                                                
  • Roller rockers    S&S                                                                     
  • S&S lifters                                                                                     
  • New exhaust valve                                                                          
  • New exhaust valve guide                                                               

    Also, with the addition of a larger throttle body there is plenty more torque and horsepower available. 

    There are several kits that I have done and proved to be good combinations. 

            
    Suggested Performance Combinations:

    FLH,FLHT,FLHR MODELS....heavy bikes w/bags, trailers and/or big people.
    Power Output:      100+ Torque  90-95 hp         
          
    Stage 2 heads, 
    95" 9.5 Piston Kit, 
    Andrews 26, 37 cams, Woods #6 or 7 
    Power Commander USB111 
    Good exhaust    
    
    Softail, Dyna, FXR

    Power Output:   105-115 torque    95 - 110+ HP 

    Stage 2 heads
    95" 10.1+Piston kit
    Andrews 32,54, 55 or 60 cams, Woods TW-7,TW8 or TW9
    Power Commander USB111
    EFI or S&S  E/G, Mikuni 42/45 carburetor  
    Good exhaust      

    There are plenty more options available. JUST ASK !
    For questions, options & prices please contact me at:   n2ofaster@charter.net 
 

2006 Street Glide DVR heads  98"  Woods #8 cams, V/Hines pro pipe

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2008 DVR heads, Tman 590 cams,  Supertrapp ex.

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2005 Fxstc  converted to a 107 (4.375 X 3.93), Pro pipe

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Cylinder Boring

I also do cylinder boring for those folks going from 88" to 95" ci, 88" to 98", 96"-103" or 96" to 107" or for just refreshing that tired set of cylinders, whether they are on a Twin Cam, Evolution, Shovelhead or any other model HD.  I use a Kwikway boring bar and all cylinders are torque-plate honed I also do cylinder boring for those folks going from 88" to 95" ci, 88" to 98", 96"-103" or 96" to 107" or for just refreshing that tired set of cylinders, whether they are on a Twin Cam, Evolution, Shovelhead or any other model HD.  I use a Kwikway boring bar and all cylinders are torque-plate honed on a Sunnen hone.on a Sunnen hone.