2007 FLHX 103" build compatability

[Rich]

I'm considering doing a realatively mild 103" build on my 2007 FLHX but I'm not certain on the compatability of some of the parts, specifically the SCREAMIN? EAGLE PRO TWIN CAM PERFORMANCE CYLINDER HEADS** part# 16952-06 and the SCREAMIN? EAGLE PRO 50MM EFI THROTTLE BODY part# 27623-05. Does anyone know if these two will work together? I'm also concerned with the lift of the SE-251 cam with these heads. I just want a bolt in cam with no clearancing issues.

Also, any input on this combo would be greatly appreciated. I mostly ride single and am looking for overall increased performance with emphasis in the 2500-4500 rpm range. Here's my plan.

SCREAMIN? EAGLE PRO TWIN CAM PERFORMANCE CYLINDER HEADS** 16952-06
SCREAMIN? EAGLE PRO 50MM EFI THROTTLE BODY 27623-05
BIG-BORE CYLINDERS 16546-99
SE PRO TWIN CAM BIG BORE FORGED FLAT TOP STROKER PISTONS* 22942-00
SCREAMIN? EAGLE PRO COMPRESSION RELEASE 32076-04
SE-251 Cam Kit* 25466-06 (or possibly Zipper's Red Shift 575TC cams)
SCREAMIN? EAGLE PRO PERFECT FIT PUSHRODS 18402-03 -.030"

I forgot, I'm currently using the stock head pipes with pre '06 SE slip-ons. I plan to change these out to Roadburner (Hard Krome) touring pros if/when they become available. These are a similar stepped header design to the Rinehart True Duals. I'm currently using a ThunderMax w/ Autotune for tuning, but I also have a SERT for this bike if I need to go back to it.

Thanks

[Mike]

1. The 251 cams are completely compatible with the SE Pro heads, as well as the RS575.
2. The "06" version of the SE Pro heads retain the 1.630 intake port diameter and does not match the 50mm throttlebodies 1.730 manifold port I.D. This could be remedied by opening up the ports on the heads to match. The SE ports actually measured between 1.635 to 1.644 (on this particular set of heads we have in stock) as they are "as cast" and vary.

The build sounds very good. Both the Thundermax or SERT will give good results. In theory the T-Max would not require dyno time other then base runs to see the end results.
Mike

[Rich]

Thanks, Mike. My other thought was the 103+ heads and associated pistons with a SE 258 cam. Any advantages or disadvantages to either?

Btw, your time and advice here are greatly appreciated.

[Mike]

The 103+ heads should be comparable to the SE perf heads and have the larger intake ports to match the SE 50mm t-body. The dyno has shown the SE Perf head to give slightly better numbers however. Another consideration would be the CNC ported heads, very good (just watch manifold matchup to the ports). A bit too large (valves and port volumes) for 95ci motors but good for 103 and up. I would go with the 257 cams for a touring bike with compression around 10.5.
Mike

[Rich]

Thanks, Mike. That's a big help, exactly what I needed to know.

[roofeditor]

Mike - 2007-05-16 9:35 AM

The 103+ heads should be comparable to the SE perf heads and have the larger intake ports to match the SE 50mm t-body. The dyno has shown the SE Perf head to give slightly better numbers however. Another consideration would be the CNC ported heads, very good (just watch manifold matchup to the ports). A bit too large (valves and port volumes) for 95ci motors but good for 103 and up. I would go with the 257 cams for a touring bike with compression around 10.5.
Mike

Do the 103+ heads raise the compression on a 103 BB kit? Just wondering.

[Rich]

roofeditor - 2007-05-19 7:30 PM

Do the 103+ heads raise the compression on a 103 BB kit? Just wondering.

I don't know what happens if you try to use them with the stock 103 pistons, don't think I'd do it. But if used with the 103+ pistons, the compression is raised to 10.5:1.

[Mike]

Should be used with the pistons to also help maintain quench.
Mike