Rushmore 103 build options
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Road Master
Joined: Mar 2020
Posts: 1,078
Likes: 267
From: New England
Rushmore 103 build options
I have made a few posts in this section and you guys always provide excellent information and quality feedback. I originally made a post about upgrading my 16 FLHXS with a 110" big-bore kit, and it seemed that the general consensus was boring the original cylinders to 107" is a far better option (cost and reliability wise). Now I guess I am on the fence between these two possible paths: Keep in mind that I am planning on turning the wrenches myself over the winter.
Option A - Only cam chest work (cams, cam plate, bearings, oil pump). Material wise, let's call this route roughly $1,100.
Option B - The above work PLUS boring cylinders to 107", sending cylinder heads out for work as well, bigger throttle body & fuel injectors. Obviously this option will require some clutch upgrades as well (suggestions would be excellent). Let's call option B, an additional $2,500 minimum.
Right now my Street Glide has about 15,000 miles on it and I have not opened up the cam chest to measure crankshaft run-out (yet). This is my primary bike that goes on many weekend trips (500 miles about) so I really don't want to compromise much if any reliability. How much more performance would I gain by going all out as in option B aka is it really worth the coin? The only reason that I don't want to start with option A and then finish in the future with option B is because of cam-selection. I want the cam selected to meet the end result of the build, I don't want to change the cam twice. I am running Thundermax so I would plan on sending the jugs and heads to Zippers...
Thanks very much
Option A - Only cam chest work (cams, cam plate, bearings, oil pump). Material wise, let's call this route roughly $1,100.
Option B - The above work PLUS boring cylinders to 107", sending cylinder heads out for work as well, bigger throttle body & fuel injectors. Obviously this option will require some clutch upgrades as well (suggestions would be excellent). Let's call option B, an additional $2,500 minimum.
Right now my Street Glide has about 15,000 miles on it and I have not opened up the cam chest to measure crankshaft run-out (yet). This is my primary bike that goes on many weekend trips (500 miles about) so I really don't want to compromise much if any reliability. How much more performance would I gain by going all out as in option B aka is it really worth the coin? The only reason that I don't want to start with option A and then finish in the future with option B is because of cam-selection. I want the cam selected to meet the end result of the build, I don't want to change the cam twice. I am running Thundermax so I would plan on sending the jugs and heads to Zippers...
Thanks very much
HDF Community Team
Joined: Jun 2006
Posts: 12,780
Likes: 2,609
From: san antonio
Option B but don't think the cost/benefit is there for larger T/B and injectors for an additional 3 cubic inches; the OEM T/B and injectors should be adequate. You did not mention exhaust and depending on current setup, upgrading the exhaust system could be a better place to spend the money as well as replacing the air intake with the SE Heavy Breather. JMHO.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Why does option A require the pump and plate? For that matter, neither option requires it IMO. It's not like you're going with a 124" or anything.
I would do a solid 107" with pistons, compression ratio, and cams commensurate to your riding style. There's a few builders on this forum who can accommodate you there.
I would do a solid 107" with pistons, compression ratio, and cams commensurate to your riding style. There's a few builders on this forum who can accommodate you there.
Road Warrior
Joined: May 2011
Posts: 1,956
Likes: 439
From: florida
It depends on the cam choice. If a torque cam build sure, OEM 50mm will tap out around 115/117 hp. If the build goals are 120+ then a $350 SE unit w $160 5.3s would make a difference in upper rpms. The stock TB will be the choke point on a build w head work
Thread Starter
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Road Master
Joined: Mar 2020
Posts: 1,078
Likes: 267
From: New England
Option B but don't think the cost/benefit is there for larger T/B and injectors for an additional 3 cubic inches; the OEM T/B and injectors should be adequate. You did not mention exhaust and depending on current setup, upgrading the exhaust system could be a better place to spend the money as well as replacing the air intake with the SE Heavy Breather. JMHO.
HDF Community Team
Joined: Jun 2006
Posts: 12,780
Likes: 2,609
From: san antonio
I don't disagree; dealers choice. My post was JMHO on cost/benefit for the gain.
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HDF Community Team
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From: san antonio
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