I will admit, if I had it to do over and I knew then what I know now; I would not have gone with the 103 Stage IV from HD. But that doesn't do anything to help the OP.

Actually, the 110+ heads perform best with a high-lift cam....that is, .590 and higher. My bike runs like a striped *** ape with my current cam, the TR-625. That's why I'm trying to suggest to the OP he not drink the kool aid as well.

Jim

 

Jim,

Were any other mods/parts required to use the TR-625? Given the 103 kit as a starting point/common ground (perfect push rods, 58mm TB, all the rest previously noted, etc), is there anything else different between your set up and mine besides the cams, pipes, and tuner?

Dan

 

If you look at the flow charts of the 110+ heads you will see that after .550 valve lift they don't gain alot in the flow. 242cfm at 550, 247cfm at 650. Any cam that lifts the valves over 550 will be fine, its how long you are able to keep them open that makes power.

 

Nope nothing different that I can think of. The reason I went from running the .590 to .625 is because a friend of mine had been running the .625 in his modified 110 engine and went with the 662-1. I am planning to go to a 107 over the winter and figured as long as I liked the .625 in the 103, I'd go ahead and run it till I went to the bigger bore. I do not feel much difference between the two cams. Probably because the intake closure is similar between the two cams.

If you decide to change cams, you may need a gasket for the cam cover. And you may need new O-rings for the cam plate/oil pump. You will want to get a set of adjustable push rods. The SE PRs (18404-08) work fine and come with new tubes and O-rings. I believe they run about $165 retail. If your dealer didn't change the cam bearings to Timken, you'll want to change them. They run $18 I think....I can't recall for sure.

Listen, this is a project you can do yourself over the course of a weekend, easy. You might need to borrow a tool or two and there are several posts on this forum that takes you step by step through the process.

Good luck,
Jim

 

One of the reasons I made mention of the Wood 555.
BUT on the other hand, ONCE those heads are attended to, they have the ability to be great performers, even with cams as high/higher than .650" lift.
Have seen them run 187cfm @ 10", @ .700" lift. (312 @ 28")
Scott

 

Scott,

When you say "once these heads are tended to...." If I were to send my 110+ heads to you, what work would you do and what would be the approximate price tag.

You may PM with your response if you would like.

Thanks,
Jim

 

Woods 400 works pretty well for me.

The Woods 8 or 9 or 408 cams like more compression than I have and I am at 10.5-7.

Had the woods 7H--0.575 cam in and it also is a excellent cam. Very similar to the 400 but for lift. Overall this 7H is a very good cam. Comes on low --2000 RPM --and goes till you can't stant it.

 

Scott,
Would be curious to know the answer to that as well.

Jim,
Not sure I'm mechanic enough to pull this off in a weekend, and would need tools LOL, but definitely appreciate your feedback! This may be something I tackle over the non-riding season. Thanks!

Dan

 

Jim and Dan,
Those heads are sleeping giants.
They run off at 185 cfm plus, once ported, grabbing big air as soon as they come off the seat, and really rolling in the all-important mid-lift area. On another message board, there is dyno evidence from Gails Harley-Davidson, in Grand View, Mo, of that head(our work) 107"/Wood 8/V&H pipe/58 S/E t/body rolling off 129 hp, and flat-lining 120 ft/lbs.
His screen name is ridgidthumper, and he was just over here, on a thread in the blower section.
Don't like tossing pricing around too much, so if you guys want to call us, happy to discuss the particulars.
Scott

 

Scott,

I'll give you a call Monday to discuss.

Thanks,
Jim