103HO Upgrade Good Deal ?
Thread Starter
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,091
From: Eastern IA
103HO Upgrade Good Deal ?
I'm looking at getting some more power out of my 14 103HO SG motor , talked to a shop the other day that said he was running a special that sounds pretty good , wondering what folks here think about it ?
Check crank run out before they start work
My103 cylinders bored for new pistons to make 107
New S&S lifters and adj push rods
New inner cam bearings
T-Man 590 cams
Upgrade oil pump
CC and surface heads for corrected compression ratio
Barnett HD clutch spring
TTS tuner
Install / perform all the work and dyno tune
$3900
Extras :
Hpi 55mm TB add $550
5.3 injectors add $200
Dyno sheet on this set up turned in a 111HP and 128 TQ ,
nice torque curve with a 100 ft lbs at 2K , hit 120 ft lbs at 2700 arching to 128 ft lbs 3500 - 4K, carrying 120 ft lbs through 4800 rpm
Check crank run out before they start work
My103 cylinders bored for new pistons to make 107
New S&S lifters and adj push rods
New inner cam bearings
T-Man 590 cams
Upgrade oil pump
CC and surface heads for corrected compression ratio
Barnett HD clutch spring
TTS tuner
Install / perform all the work and dyno tune
$3900
Extras :
Hpi 55mm TB add $550
5.3 injectors add $200
Dyno sheet on this set up turned in a 111HP and 128 TQ ,
nice torque curve with a 100 ft lbs at 2K , hit 120 ft lbs at 2700 arching to 128 ft lbs 3500 - 4K, carrying 120 ft lbs through 4800 rpm
Elite HDF Member
Joined: Jul 2007
Posts: 3,903
Likes: 1,122
From: 48.067222,12.863611
Agreed. The 50 TB is enough on that build. I pulled 120HP out of a 50mm on a 107. It did hold the build back a few HP, but it wasn't worth the $ IMO or the builders.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
IMHO, a fair price for the scope of work. The TMan 590PS2 cam is a good one; have run it's predecessor, the 590, in my all bore 107" '02 FLHT with good results. Did change to the 600SM and liked it even better but I think TMan has dropped the 600SM from his Twin Cam line. Set compression between 10.5 and 11 and, with a good tune, you're gonna love it.: Larger T/B not a cost effective upgrade IMHO and durng the tuning process your tuner can see if the 4.9 injectors are operating in their duty cycle but the larger injectors should not be required either.
Thread Starter
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,091
From: Eastern IA
IMHO, a fair price for the scope of work. The TMan 590PS2 cam is a good one; have run it's predecessor, the 590, in my all bore 107" '02 FLHT with good results. Did change to the 600SM and liked it even better but I think TMan has dropped the 600SM from his Twin Cam line. Set compression between 10.5 and 11 and, with a good tune, you're gonna love it.: Larger T/B not a cost effective upgrade IMHO and durng the tuning process your tuner can see if the 4.9 injectors are operating in their duty cycle but the larger injectors should not be required either.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Thread Starter
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,091
From: Eastern IA
Plugging the data into the BigBoyz calculator shows static to be 11.3:1, corrected at 10,2 and CCP at 217psi, so hope you have a really good tuner and compression releases. I run a 98" motor just a tad under that evel of compression but I do have a really good tuner. Just a cautionary note to double check the compression calcs to be sure you and the builder/tuner are comfortable with the level of compression. Might want to consider a 3cc dome piston?
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Seasoned HDF Member
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From: poway
It would if the heads were ported but they aren't..
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Road Master
Joined: Oct 2012
Posts: 777
Likes: 45
From: Beaumont, Ca
Right now I am having some work done on my bike and I will be paying around $2,400 and only for about half the work that will be done on your bike. The only parts I am getting new parts I am getting are an oil pump and a new cam support plate, plus some work on the heads, valves, and valve guides. Your price is not unreasonable.
Last edited by cgmartine; Mar 23, 2021 at 02:02 AM.