The Best Harley Davidson Twin-Cam Upgrade That Almost Nobody Does!

In this video, I discuss my thoughts (as a trained Factory technician for 22 years) on performance upgrades for Harley-Davidsons, and how most of us enthusiasts skip over the very best upgrade until last.

#harleydavidson #harleydavidsonmotorcycles #performance #twincam #engine

[Mark-mmke]

Oh yea. You are so right on. After getting my 2014 SGS, I did the Woods 222 cam, V&H power duels, map and air. Ran great. In 2015 I sent my heads to Dan Vance Racing. He is one of the best HD head guy there is. He came out of motorcycle drag racing and understands torqe. He has a proprietary way of doing heads. All I can tell you is when I got my bike back together, the power from those heads matched all the rest I did the year before. Seat of the pants was a stunning difference. No problems all these years later either. Specs are 116 lb/ft torque and 103 hp on my 103ci. Torque comes on right at 2100rpm for 100lb/fl. She's a runner. Changed the suspension to Terry Cable rear shocks and changed out the front fork dampner for his. What a difference that made. Handling is tight in the corners and comfy running down the road. No bottoming, no diving. LOL Thanks for the video. Good job.

[jeffkinsey]

Your correct. 96 in to 103, screaming eagle high compression pistons, cams, 58mm throttle body for the larger injectors, re-worked cvo 110 heads with port work and valves, pro pipe 2 into 1 dynoed 125 hp and 118 torque. Tire shredder

[henrymetevia]

Just found this post ... turned my 96ci into a 103, stock heads, andrews 48h cam, feuling cam plate & oil pump, cobra 2 into 1, dynoed at 97 hp, 112 tq ... was I suprized !

[esesrides]

103 heads standard flow pretty good, had mine port matched that’s all along with an Andrews 54 cam(fits standard motor) and bored to 107 upgraded injectors to 5.3 and got 110hp and 123ftlb. Better numbers than Harley’s stage 4 upgrade. 103 heads are mint 👌

[ihatesjws]

It all depends on what your goal is. If you plan on only one, either cam or heads, then get the cams because you get more power from cams only vs doing heads only. If you plan on heads and cams then you can do either one first but have the specs for the cam to properly set compression and squish for the heads. Heads and cams go hand in hand and should be planned together even if they are not installed at the same time.

[kennethkuehl]

Had the heads on my 95” fxstdse ported by JET in Rhode Island. Actually shrink intake, weld up and cnc machine in “cvn” profile.

[mitchblackwood]

1st thing ive done on every harley ive owned is heads, cam, intake and exhaust, on my twin cam i also swapped my sprung cam chain tensioner for hydraulics, i bought a 2019 road kind and when i finally opened it up to start upgrades i immediatley put it back together and traded it for 2 more evo fxr's and ill never buy a new harley again, milwaukee 8s were sposed to make up for the twin cam debacle and id say it fell flat, thanks for the video

[mickc]

You are so correct I am done with the my build I have a 110 CVO. I kept it a 110 went with 10 to one Pistons, but I sent the heads out to branch and O’Keefe and they ported polished flow and deck the heads they are beautiful. I also went with a 58 mm throttle body so I don’t know I’m not making quite 10 1/2 to one and they advise me on good cams so I went with Andrews and I was gonna go with her and then I went up and they advised me to go with the little bigger ones that I’m gonna tell you what I’m making . I’m not sure which cams they were. I didn’t even know. They changed them on me but oh that stuff out in the bike. The bike runs real nice man. It died out real nice. Took the tune real nice no problems. Super happy that’s rear wheel horsepower and torque to not what Harley says. Harley goes. I don’t know where they get their numbers, but they’re not rear tire horsepower. It’s got nice power all the way through and I took the speed limit off it. I haven’t tried that for sure. I just figured while we’re in there I’m gonna do it. Should be a good bike to buy almost 60, 000 miles on it. it’s been a good super happy with it getting the head done really did the trick and the throttle body. To go with the cams best way to go. Branch and O’Keefe really helpful really knowledgeable on the recommendations for the cam and of course when they’re doing the heads, they want to know you’re doing depression and everything so. And their prices are right with your numbers. They’re like fucking jewelry, I was gonna wear them around my fucking neck but happier my little twin 110 run pretty good now specially I run it heavy up and down the road should be in Tennessee pretty soon from Pittsburgh. I love that ride. Will break it in going to Gettysburg this broken, I like to put a little bit of miles on and change your oil take a look thanks man

[lpdsnipe]

I learned as a young engineer 50 years ago in the Navy and Merchant Marine working with turbos and superchargers, that the more air you get in, the more power you get out. But like you said, it has to be the right airflow. Porting and polishing... The air flow has to be done correctly. You can't just shove a bunch of air in and expect to get more power out.

[michaelmitchell]

I had my s.e. 103 heads done by gms racing in Uniontown, PA also custom dynoed by gms, hpi throttle body, Andrew's 57 cams, injectors, wiring, ignition, bassani 2 into 1 pipe. Gms did a 5 angle cut on the seats, better springs, honed the guides, the works. That was the best running motor I've ever owned. I'm still sad today cause I had to sell it for financial reasons ....I hate myself..lol

[thedood]

I'd just get a vmax or rocket 3 for a power cruiser. I like to work on bikes, I usually go with improving the crappy wiring then go to the engine.

[michaelsmartin]

after cams I did S & S heads with the big valves Best upgrade I made. 2004 Dyna Internal engine now all S&S

[roberthough]

I'm glad we have a lot of good old boys like you left that know what they're doing 👍 I have just one question if you could answer it please?. I have a 2003 FXSTS, and considering an oil cooler, on top of the oil filter chasing facing forward or two plugs, are those for tapping into a oil cooler, I've seen other videos with people adding coolers but they don't use those plugs? What are they used for them?. Thank you Robert in Arizona, hot as hell!

[alanwhiteside]

Good video and you got a point there. 😎👍🍻

[tomskehan]

I’m having the S&S 110 Big bore kit installed on my 2009 FLHTCU with a 574 Cams and Cobra Headers, also DYNO Tuned and Crankshaft replaced, can’t wait to see the Torque and HP it puts out! What are your thoughts, how much Torque and HP do you think the DYNO will record?😃

[samcook]

I've learned my lesson throughout my Twin Cam journey I think its better to just add a Trask Turbo and a nice built bottom end for that run-out

[DarrelllCampbelll]

I clicked on this thinking about doing an engine upgrade and I thought this guy looks familiar. I met you in Perryville a few years back. Youre a mutual friend of Steve Scott. We went and had beers with his gang. Anyway I subscribed. Im looking forward to doing my first upgrade from 96 to 110 on my fatboy. Wish me luck. Come out to Las Vegas anytime free room and board.

[johnwoods]

You can have big bore huge throttle body but if you not moveing air your loseing. Its like a woodstove you cam opon the door and it will burn, but close the door leave a crack and the air starts moveing so fast you can hear it and it burns way hotter . The idea is velocity in moveing mixture in and getting it out.

[llerradish]

I have 2012 ZX14R ( first year of the second generation) they bumped the cc's up to 1441 from 1352 or 13 something. They also claimed it is the first production motorcycle with hand polished head ports. I guess they knew what they doing because it out performed the Hayabusa in 2012.

[JHV]

I think you meant "Turbulent Flow" rather than "Laminar Flow". Laminar flow is not good for intake performance. Turbulent flow results in better cylinder filling while LAMINAR FLOW, basically stalls the air (A common mistake for "new head porters" thinking that a shiny port is the cats' ass. In reality, introducing some irregularity in the port will result in much better flow and cylinder filling. Mirrors look pretty but will flow worse than your stock heads. Good advice, however, that with all the other performance add-ons, if you can't fill the cylinder, you're cheating yourself.