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Discussion Starter #1
I am prepared to upgrade the stock cams in my bike with either Andrews 57H or Woods 222s. Now I am wondering if I would be better served to just do a 107 big bore kit.

The additional cost for the 107 seems relatively minimal but is it truly worth it?

Any advice/recommendations is greatly aprreciated and received.

Semper Fi,
 

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The additional cost for the 107 seems relatively minimal
We love spending other people's money around here, so yes, go for the big bore kit!:D
But seriously, the 107 isn't just for the displacement boost; you also boost compression (which I think is the bigger advantage), which will give you even more gains from the cam upgrade. So if budget allows, I'd say it's definitely worth doing.
Then of course you get into whether or not to port the heads while they're off, which I could make a case for or against, depending on your performance goals and budget.
So while the cams you mentioned are designed around a stock engine and give a nice increase on their own, yes you will see more gains from the big bore for minimal cash outlay if you want to take that next step. Just remember it's a slippery slope in the neverending quest for more power...
 

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I've got a 103 with SE204 cams, runs really nice with 20,000mi on it. It drinks not one single drop of oil, shows good compression and does not blow oil out the breathers. I'd be hard pressed to bust open a well sealed motor good running set of pistons/cylinders and chance having an issue(it does happen), just to gain 4 cubic inches.

A good portion of the power gains come from the head work and thinner head gaskets(tighter squish/more compression) done while the 107 kits are installed, the gains from the 4 extra cubes are minimal in the overall picture.

Something to consider.......
 

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I went to 107 because I had a 96, if I had a 103, I doubt very seriously I would have gone to 107, I probably would've done cams, and maybe some head work.

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The 107ci will get you more torque.
I got 110hp and 120 torque in mine.

My 103 in the last bike with the same compression was 101hp and 107 torque
 

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I am prepared to upgrade the stock cams in my bike with either Andrews 57H or Woods 222s. Now I am wondering if I would be better served to just do a 107 big bore kit.

The additional cost for the 107 seems relatively minimal but is it truly worth it?

Any advice/recommendations is greatly aprreciated and received.

Semper Fi,
I just went thru the same debate...my opinion is: do the cams and heads and get it tuned. I cant believe how much better my bike runs after it spent a couple hours in the dyno room.

And thank you for your service Marine!
 

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While we sell 107" kits, a man with a 103" would be better served to install a set of cams, and some cylinder head work.
With that said, and with the increase of valve sizes in the heads once completed, and usually re-surfaced to optimize compression for the given cam, valve to piston clearence needs to checked/established.
Scott
 

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I went with the Andrews 57h cams for my '13 RGC - I am very impressed and happy I didn't do a 107. I spent that money elsewhere! LOL
 

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Discussion Starter #10
Thanks to all, after the advice, I think I am going to go with the 57H cams and get the heads ported. Hopefully if will be what I am looking for.
 

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Thanks to all, after the advice, I think I am going to go with the 57H cams and get the heads ported. Hopefully if will be what I am looking for.
The heads won't give you too much extra but they will drain your wallet.
Just do the cams see how you like the bike after a good cam is in the bike.
You can alway do the other mods later on.
 

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I did the 107 with 57H cams, screamin eagle valve springs and heads done from Big Boyz. If I had to do it over, I'd drop the 107 and do cams, heads and springs. A good tuner is important too. I run a Power Vision.
 

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PS.. The heads DO provide a good bit of flow (increased power). Don't forget to clean up the casting flash in the intake and port match the throttle body to your air cleaner. There is a lot of obstruction there.
 

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PS.. The heads DO provide a good bit of flow (increased power). Don't forget to clean up the casting flash in the intake and port match the throttle body to your air cleaner. There is a lot of obstruction there.
The heads may provide a little bit of extra power but 2 to 7 ft lbs of torque gain for a $1000 dollars isn't a good return on your money, if you want more power spend the money on a 107 build and use your stock heads . A good cam will jump your torque up 15 to 20 ft lbs for around $350 to $400, this is just the cost of parts you can add labor cost if you don't do the work yourself.
Unless you are drag racing from stoplight to stoplight or you are trying to beat your buddies to the next tavern so you don't have to buy the beer a 103 with a good cam and stock heads will give you everything you need in a touring bike.
The bonus is you have more cash in your wallet and a good running bike too. ;)
 

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The 103 with a cam upgrade do it if you looking for a boosting the stock engine to its potential.
For the 107 will wait until more is needed. If I go to bigger pistons, high flow heads will do the bottom end, clutch, compensator and few other details to get it right. Only if have near 100K miles.
But is your choice after all.
Since you ask that was my two cents.
Good luck with your choice.
 

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B ig boyz head porting

I did the 107 with 57H cams, screamin eagle valve springs and heads done from Big Boyz. If I had to do it over, I'd drop the 107 and do cams, heads and springs. A good tuner is important too. I run a Power Vision.
Were you happy with the job Big Boyz did with your heads, and did they also do your throttle body? i am seriously considering them due to much less cost, and i have read on the hd forums that they do good work. Not much here yet on them. I to have the andrews 57H, t max and Dragula pipe, but just want a little more. If they are good you can't beat their prices.
 

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Were you happy with the job Big Boyz did with your heads, and did they also do your throttle body? i am seriously considering them due to much less cost, and i have read on the hd forums that they do good work. Not much here yet on them. I to have the andrews 57H, t max and Dragula pipe, but just want a little more. If they are good you can't beat their prices.
I am very happy with the heads work from Big Boyz. They are very knowledgeable and we talked for a while about what I wanted out of the motor and how I ride. I also dropped down on my head gasket thickness to bump compression up a quater point. I'm running right at 10.25:1 on this crappy 91 octane out here in AZ and it pulls strong. With the Screamin Eagle valve springs in I can spin the engine all the way to 6200rpm without valve float.
 

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Here are a couple pics of the head work
 

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sorry two of same pic
 

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compression setting.

I am very happy with the heads work from Big Boyz. They are very knowledgeable and we talked for a while about what I wanted out of the motor and how I ride. I also dropped down on my head gasket thickness to bump compression up a quater point. I'm running right at 10.25:1 on this crappy 91 octane out here in AZ and it pulls strong. With the Screamin Eagle valve springs in I can spin the engine all the way to 6200rpm without valve float.
Sounds great, can i ask one more thing i was told a 10:1 compression was as high as you wanted to go on the 57 h, which i already have, so why did you go 10.25:1 sir?
 
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