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So I've got a 2006 FXD35 that is currently torn down for an engine rebuild. I've got some parts for it, stuff I've collected over time, just trying to decide what to route to go. Here's a list of parts I've got: 4-3/8" flywheels (they need rebuilt), 110 heads, 110 cylinders, 113/120 cylinders, TW-400-6 cams, S&S 585G cams, ported stock heads, 103 cylinders. The engine build that was in it was a 95" with the 585G cams and 1.675 ratio roller rockers. It actually ran really good but looking for more and would like my torque a little earlier. My thoughts were 103, 107, 110, 113 or 120 build. Originally when I started collecting parts I planned on going 113 with the TW-400 cams but now I'm considering going 120 since oversized 113 pistons seem to be difficult to find. I'm really open to all options but I am on a little bit of a budget. Not really sure what other info to post so feel free to ask questions. I like a flat torque curve that comes on early, also any parts I don't use will be sold to recoup some cost.
Well 107 is the limit without boring the cases unless you use the 110" cylinders from Harley.... If you do decide to go big just do a 124 build and don't forget to upgrade the cam plate
I know the cases would need bored for the 110 cylinders or the 113/120 cylinders I already have. Also I already have the Feuling Race Series Cam Plate and Oil Pump kit. I do not want to buy new cylinders to do a 124, I especially don't want S&S cylinders since they look different than the Harley-Davidson cylinders. I'm trying to keep the engine as stock appearing as possible because it's an Anniversary, #837 of 3500.
The 585s will "come on" earlier in a bigger engine, and still carry out to the right- a 113 (4.375 x 4.060 flat tops) set for 10.8CR with well ported stock heads ( go ahead and add the ACRs/harnesses while you're there).
Another option is to get a set of Diamond Racing pistons (4.085" with a +6.5cc dome), have your cylinders bored/honed to match, and then use the 110 heads @10.8.
Either of these will feel like you've added a third cylinder, properly tuned.
I'm running S&S 585 cams in my 117", more than happy with them. I'm at somewhere around 10.75:1 compression, ported heads with oversized valves, 58mm throttle body. When I was reasearching my build a lot of knowledgeable dudes (including the guy who did my heads) recommended the 585s for my goal of solid midrange torque and still having a decent top end.
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Performance engine rebuild advice
