Harley Twin Cam Big Bore Kit With Ported Heads 95" (1999-2005) Stock #08282013 on 2040-parts.com

A quality performance big bore package setup for .510 lift cams.  Performance products for a powerful and dependable build. This is a full service ported and polished set of heads . Nice clean dealer takeoff heads and cylinders  like new condition along with brand new Ross forged pistons. 

Harley Twin Cam Ported, Polished and Flowed Performance Heads, -99 series heads,  Ross( forged) big bore flat top piston kit and cylinders. 

With over 35 years of machinining and polishing service to the performance enthusiast. I still run a one man shop with my number one priority "Quality"

These are clean dealer takeoff heads and cylinders, with  1.850  Intake,  & 1.575  exhaust valves.

 Each set of heads are flowed, These are actual flow numbers for this set of heads, not a generic flow.

These heads flowed very high Volume and Velocity which will give you great performance both on top and through the gears. Very hard pulling heads that average 85-95hp with 85-100fpt depending on your setup on a 95" motor with a set of .510 lift cams.   Velocity porting  is done, which incorporates a D-Ported exhaust port and a split port Intake port design. The D-porting creates a linear flow on the exhaust port. Air will move faster, through the exhaust , and create added torque as it acts as a vacumn on the intake charge. This is why you have cam overlap between the intake and exhaust. The Intake ports get a split design. This helps to move the fuel charge around the valve in a more efficient manner.

These heads will fit 99-05 twin cam motors. The heads have a very high lustre on the exhaust ports and the combustion chambers to reduce the carbon buildup and run cooler.  The intake ports are finished to 80 grit, to atomize the fuel.The intake ports are ported  for excellent fuel transition through the port. You would'nt want highly polished intake port, as the fuel would stick to the port walls. The ports are port matched with precision cnc machined porting rings. I use manganese bronze valve guides, which pulls the heat from the cylinder and valves and offers extended life.. The  1.850 intake valves are machined with a muti-angle profile.  The 1.550 exhaust valves are also   machined with a multi-angle profile for added flow.  This is a multi-angle valve job.The port side of the valves get a swirl finish. This helps to atomize the fuel as it enters the combustion chamber. Remember, the liquid part of gas does not burn, it's the vapor. It needs to be atomized. This is why you can have a really strong motor, and still get 50 mpg. "Efficiency"   The valve seals are new Viton seals which are the best for wear and heat resistance. The heads are decked .028 to create a 9.8:1 compression with the Ross forged flat tops pistons and a stock big bore gasket.  Excellent compression for a powerful and dependable street bike. The rocker side is machined .005 to ensure a good seal.  I would recommend a .510 lift cam with a .235-.250 duration with these heads.   These heads are ported to increase velocity and volume which will give you much more torque and top end. The air opens up very fast. The increased air flow through the entire lift range increases torque. Not just on the top lift. Torque is that great feeling you get when you twist the throttle. I don't like huge ports because it slows the velocity. Think about it , you could bore a huge hole, lots of volume,but that volume would move very slowly. Result ,no torque, no bottem end. Most of us don't ride at 6000 rpm's.They are meant for a strong running street bike, not race engines. Of course we all like to twist the throttle every now and then. You will not be dissapointed with the power and torque you get from this setup. The cylinders are bored  with torque plates and honed to fit the Ross forged big bore pistons, that are supplied with this kit.  You will need to increase the jet size on carb models or increase fuel, through fuel management on fuel injected models.The heads are cleaned and lubed before assembly. Finally I test the valve to seat for a tight seal. They are dealer new takeoffs heads, ready for your project. These are an outright sale, no down time, no trade required. Cores are accepted if you desire. Buy with confidence, Money back guarantee.  I have sold many of these on Ebay with 100% feedback. You won't find another big bore kit at this price with all the detail work I have put into them.   This Dunnperformance big bore kit will produce incredible, clean power through the gears. Thanks, from Dunnperformance    I will ship to countries outside the U.S.    

 I also have a new black 103" touring package available. Please call or visit me at my website: Dunnperformanceheads.com  Any questions you may have, always happy to help. 303-718-7146 or 303-814-8913 

A few testimonials from some recent customers.  Just remember a stock 88" motor will pull 62hp with 68fpt. at the wheel. You will be looking at a 27-32hp gain with a 32-38fpt The increase in power is dramatic. Around 90hp with 90fpt on this 95" kit.    Built to be  Powerful and dependable.    

Thanks for doing such a great job on the heads!!!  My mechanic and his machinist were impressed w/the quality. My son nicknamed the bike the “Beast”

We did 97 hp and 98 fpt on my fxd with your 95” big bore kit, and a set of Andrews 54 cams

I just wanted to say thank you for a high quality product! I am super pleased with the massive increase in power and torque with the new 103 kit. It is literally like night and day. Thanks again and keep up the good work!
Roger

This is an update on the 103" big bore and stage II heads I purchased from you.  Totally impressed with the work on the heads as they really woke up my '07 Ultra classic. The torque is awesome and is "right there" as soon as you move off idle. This thing pulls HARD and evenly from start to finish. The 103 jugs you bored were on the money as far as size and finish. This was my first Harley-Davidson build and went extremely well  and easier than I expected. You furnish an excellent product and great advice!