Engine Swap ?’s
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
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From: poway
You can't swap the crank even tho the stroke is the same. The left side shaft has different splines.
Add:
Motor won't swap either.
CVO heads to get are the 110 heads if building a 117 or larger.
Last edited by Max Headflow; Oct 10, 2023 at 06:37 PM. Reason: add.
Road Captain
Joined: Mar 2020
Posts: 650
Likes: 351
From: Sierra foothills
You can swap over all the parts except the crank/flywheel and cases and pistons. Harley went to the "dick head" rods in 07 flywheel so 03 pistons may not work. Primary assemblies and left side of flywheel are different between 03 and 07 and do not interchange
Also going to timkin bearing is not necessary or even recommended much anymore. Use SE lefty roller bearings. Use your 07 crank unless run-out is bad. If your 07 crank is bad I would recommend S&S crank
Also going to timkin bearing is not necessary or even recommended much anymore. Use SE lefty roller bearings. Use your 07 crank unless run-out is bad. If your 07 crank is bad I would recommend S&S crank
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Tourer
Joined: Jan 2015
Posts: 420
Likes: 64
From: Southern Bear Flag
Probably not. Early CVO SE heads are 1.9 / 1.6 with domed chambers not bathtub.
You can't swap the crank even tho the stroke is the same. The left side shaft has different splines.
Add:
Motor won't swap either.
CVO heads to get are the 110 heads if building a 117 or larger.
You can't swap the crank even tho the stroke is the same. The left side shaft has different splines.
Add:
Motor won't swap either.
CVO heads to get are the 110 heads if building a 117 or larger.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
None unless you plan on building a bigger motor than 103. The 07 heads aren't too bad. You want simple, bore the cylinders and add a cam..
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Tourer
Joined: Jan 2015
Posts: 420
Likes: 64
From: Southern Bear Flag
I may try and find a set of stock heads to play around with porting and polishing, stiffer valve springs and also adding a high flow intake first…then bump up the displacement at a later date.
Thx for the help and advice!
Seasoned HDF Member
Joined: Jun 2017
Posts: 5,315
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From: Granville New York
Will the 255s even make use of the screaming eagle heads or any headwork? Pretty short cam...low end torque cam but definitely runs out of gas on top. Plus too much compression will make it tough to tune.
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Tourer
Joined: Jan 2015
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From: Southern Bear Flag
Wanted to wait til I could find a set of heads to port and polish myself or better yet a set of SE heads that were already ported and bolt them on. Sounds like I’ll have better luck building a set of stock heads with some stiffer springs and a port and polish job along with a bigger intake and a really good tune.
Was hoping I could eek out 100ish HP and torque without spending a ton. Not a bad setup for well less than $1K currently.
May keep an eye out for a 110 that’ll bolt in later on. But for now I’m happy with messing around with some heads and an intake and see where that gets me.
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Joined: Dec 2005
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From: poway
Got it…SE-255 cams already installed. Was just looking for an easy bolt on bump in displacement with already ported/upgraded heads but it does seem like the SE103 heads are somewhat inferior to what I already have on my stock 07.
I may try and find a set of stock heads to play around with porting and polishing, stiffer valve springs and also adding a high flow intake first…then bump up the displacement at a later date.
Thx for the help and advice!
I may try and find a set of stock heads to play around with porting and polishing, stiffer valve springs and also adding a high flow intake first…then bump up the displacement at a later date.
Thx for the help and advice!
Those heads do flow better, about 240 at 28 where stock late heads are about 220. With a little work they'll get 250 but the combustion chamber has no squish so you need to use custom pistons and cut the head to get some plus bring the compression up.
