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[hdrider53]

I have a 02 SE Road King.
Im getting ready to do the SE performance heads and was considering changing the cam also.  How much HP gain if any would I get by switching the cams out.  It has SE203 cams in it now and I'm thinking about the SE257. Would it be worth the extra expense in labor or not.

[kng103]

I have a 02 SE Road King.
Im getting ready to do the SE performance heads and was considering changing the cam also.

[GC_Super]

The 203's and SE Heads don't play together well, especially in hot climates. Too much compression.  Most cams have a happy point for compression, just match the two together. Don't know much about the 257's, but the HD 211 and the S&S 570 are used a lot w/SE heads.

[geezerglide]

hdrider3,

My old 95" with SE Flat Top Pistons, SE Heads, Scotsmen Build by SBC, inlet valve diameter 1.900, exhaust 1.6250, CCs of Combustion Chamber was 9CCs.  I put in the SE 251 cams. Was putting out 97 HP with 104 lb ft of Torques, with Bob Woods TW6H Cams, same HP, however 114 TQ.

Pulled them out, to much valve train noise.


geezerglide

[hdrider53]

what kind and what length pipes are you running?

I will be running D&D fat cats 2 into 1.

[kng103]

I will be running D&D fat cats 2 into 1.

the 257 sould do the trick for you.
most of hd performance stuff works fairly well with eachother.
you should see a nice increase in torque and hp with the new heads, cams , and pipes.
the 203 is more for a stock or modified tc88.
the 211 is also an option.
i know a couple of people with the same mods that you are doing, and they are very happy with the results.
i don't really know too much about the 211
make sure to use the forged pistons.

[nidan]

If you are staying with SE/chain drive cams I'd agree with the 257's.  I went gear drive (TW31g) and am very happy with both the torque and peace of mind.

211's run .508 lift for intake /exhaust  31G's run .510 (basically a TW37 for hi comp) 257's run .569 . If I was going to a cam with that lift , I'd go with a Woods TW5G ,(.570) put the roller rockers in and HANG ON.

[nidan]

If you are staying with SE/chain drive cams I'd agree with the 257's.

[nidan]

This is the SE 257 dyno out of the SE catalog with 44mmCV Hi comp forged pistons SE II slipons and SE perf Heads

[spydglide]

If you are staying with SE/chain drive cams I'd agree with the 257's.

[hdrider53]

Bike already has the 1550 kit from the factory in it with flat top pistons.
I don't intend to change those.  So along with the flat top pistons and SE perfromance heads would it be best to stay with the SE203 cams now in the bike or switch to the SE257 or others?
I ride mainly highway, one up. Then take the bike to the local drag strip a few times each summer to race.

[kng103]

Bike already has the 1550 kit from the factory in it with flat top pistons.
I don't intend to change those.

[Unbalanced]

My suggestion would be to change from the 203 cam if your going as far as you are.   If you were staying with a 1550 kit and no headwork then I would suggest the 203 cam.   Now the real question comes in

Where do you want it and are you set on sticking with harley cams.  If the answer is yes then I would suggest the 204, 251, 257, but not the 203.  
 
203 = down low on stock 95" (1550) runs good about 85 / 80 for numbers
My buddy just did this to his 06 ultra and yeilded 87 / 83 for numbers no headwork yet.
204 = Down low pulling power 1800 to 5000   pulls great then falls off  95 / 95
211 = Runs its best 3500 to 5500 rpm range  peak was 98 / 95
251 = Pulls like a freight train 2600 to 5400  109 / 109
257 = I have not tried this cam myself.   I chose to go with the 55g from Andrews.

Good luck with the build and let us know what you decide on.

[Crawdaddy]

HDRider,

I have the 10:5:1 compression heads and pistons with the 257 cams and like it very much.

[1bagger]

I first installed 1550 flat top pistons , port and polish,203 cams and was a little disapointed with the gains. The next winter tossed the flat top pistons
and 203 cams.SE Stage2 down load.
Had HeadQuarters redo the heads incl. bigger valves etc, SE 1550 10.5-1 high comp. pistons,SE 257 cams, the Zippers 50mm throttle body and the Zippers air cleaner upgrade. PC111.
The first set up maybe 80hp. doubt it.  8-)Mild gains .
Then the second set up 105 HP / 108 ft/lbs
Now THATS performance, but I have to say all the gentalness of the bike is gone.
At first it was like a teenager going to the bar for the fist time,now she runs like a drunken old whore! The only thing I didn't do was add comp. releases thats next.I wish I never bought the 203's.