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[103_RK]

I have a 2003 103" SE Road King.  I ride 2 up a lot and was wondering which gear drive setup would offer the best low end torque.  I know they are both recomended as good cams.  I would like the torque to improve at the 1800 to 3000 rpm range where most riding is done.  Of course I like high numbers like everyone else.  I have Vance & Hines Big SHot Duals with thunder monster baffles.  I have ordered Daytone Twin tec's Twin scan 2 plus to use O2 sensors to adjust the afr with my race tuner.  I asked Andres which cam to use and they eccommended the 37G.  I see here that the ZIppers seems to be the cam of choice.  Any thoughts as to which would offer the torque to meet my needs?

Thanks in advance, this forum is a great source of information.

[nidan]

The 37G is a much lower lift cam .510 vs .575 for the zippers.  I have a hi comp version of it (31G) and it is a good low end cam that produces a fat flat torque curve from 2000-6000 rpm.

the 37G  does have a lower compression limit , stay under 9.8 and you'll be fine .  The 575 will provide more power , and both benefit from head work .  If you have the bandwidth The Zippers kit would be a good way to go as you get headwork/cams / larger throttlebody .  A proven and matched set .

[DCFIREMANN]

For a 103 you are better off with the 575's. They are designed for your low compression 103 motor. The valve timing has been changed to make your motor act like it has a higher compression ratio.

Be Safe

THE DAWG

[Fired00d]

The 37G is a much lower lift cam .510 vs .575 for the zippers.  I have a hi comp version of it (31G) and it is a good low end cam that produces a fat flat torque curve from 2000-6000 rpm.

the 37G  does have a lower compression limit , stay under 9.8 and you'll be fine .  The 575 will provide more power , and both benefit from head work .  If you have the bandwidth The Zippers kit would be a good way to go as you get headwork/cams / larger throttlebody .  A proven and matched set . 

Can't speak for the Andrews because I know nothing about them, however I do have the Zippers 575's and I am very pleased w/them.

Along w/Zippers there is another company (Freedom Cycles) that is offering a bolt in cam for the CVO 103ci motors (see below)


REDSHIFT 575 CAMS & OTHER PRETTY PARTS (dyno runs included in this thread).


Freedom Cycles / Yuill Bros. Cam Specs.


FCC14 Cams 103 Dyno.

Neither one of these cam packages require headwork or changing the throttle body as they were designed to be bolt in packages. I know Zippers is not recommending doing any headwork w/their cams as it will defeat the purpose of the way they designed the cams. Some that have gone w/these packages have upgraded the oil pumps (Feuling) while doing this for better oil pressure, changed lifters, and changed pushrods. 

 
Ride Safe,
Fired00d
 

[hd-dude]

Zippers 575 or the Freedom Cycles YB13 or YB 14. These cams were designed specifically for the 103 motors. The 37G is a good cam for a 88 or 95" motor.

[103_RK]

Thanks to all for the replies.  It looks like Zippers is the way to go.  I do plan on changing the oil pump as well.  Is ther much bebefit in changing the cam plate?  I see Feuling makes a cam plate as well.

[Twolanerider]

Thanks to all for the replies.  It looks like Zippers is the way to go.  I do plan on changing the oil pump as well.  Is ther much bebefit in changing the cam plate?  I see Feuling makes a cam plate as well.

Their cam plate is to be used only with their oil pump.  So it's not a universal replacement. 

Cam plate isn't a must do.  The stock part is actually pretty good.  Benefits from the Feuling plate are passage of a bit more volume and apparently the loss of a little cavitation through the galleys.

[103_RK]

Is the plate worth the $300+ cost?

[Twolanerider]

Is the plate worth the $300+ cost?

The stock piece is good enough I'd not have paid the cost for the Feuling cam plate.  Only reason I got one is I found a great deal on eBay because someone couldn't spell Feuling and no one else apparently found the ad.

[103_RK]

Lucky find.  I look on ebay often.  Find many good deals when compared to local prices.  I will have to keep an eye out for parts.

[copout221]

 I would also 86 the DTT twins scan stuff...A total P I T A to work with when compared to the Zippers TMAT. Just my .02 

[St.Pete]

103 RK
In case you havn't started yet.  I just had a Woods 6G installed.  That is the same lift as the andrews 37G.  I wouldn't argue that you will get more torque out of the 575's but I think you will need hi-lift springs for the 575's that you won't need for the 510.  A fair amount more work involved.  I am not unhappy with mine although I wish I had I had had a D&D Fat Cat put on when I did the cam.  I'm running Vance and Hines slash cut muffleres with all the fiber glass removed.  I ended up at 94 HP and 110 Lbs torque.  The torque curve was a vertical line up to 90 lbs then flattened out a bit up to 110.  I guess the real question is how much HP/TQ is enough.  Good Luck and ride safe.  St. Pete

[103_RK]

St.Pete, I thought the Zippers 575 was meant to be a bolt on without any other modifications to heads of springs?

[110tHunDer]

 
They are.   Along with the YB14 cams from Freedom Cycles in Reno, the 575s are designed to get the most out of the stock 103's hemi heads and require NO OTHER internal mods.

Good luck with your choice.  I know which one I'd do (again).

[St.Pete]

103 RK
I guess I've been corrected.  The reason I responded is Woods makes a 575 and it requires Hi-Lift springs.  Maybe it is a close call and they ere on the conservative?  St. Pete