Get XiED(tm)! Performance Parts

Don't let the Harley heat monster ruin your riding.
Reduce  Engine Surging
Improve Throttle Response
Reduce Engine Ping


HD 2007/2008 Engines

High Heat on 2007/08 HD engines

HD 2007/08 Performance Recommendations

Cool your exhaust temperature with the Wide Band O2 upgrade for 2007/08 HD

Harley Camshaft Specification Tables

HD Twin Cam Engine Builds
TC 128 HP 95 CID
TC 100HP Street Engine

The basics of Fuel Injection explained

Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget


Shovelhead and Panhead Engines
Horsepower Gallery


Performance and Technical information on engines for Harley-Davidson motorcycles.

This is a list of verified horsepower figures for a variety of Harley-Davidson Shovelhead Engines. The list provides information on the maximum horsepower recorded, the type of engine cases, the engine displacement in cubic inches (CID), head type with who did the modifications, type of camshaft, type of carburetor, type exhaust system, owner of the bike, the type of frame the engine was mounted in and the source of the data. Data sources used in building this list include Cycle-Rama, AMI, and various magazines. All horsepower figures listed here were confirmed on a dynamometer.

To have your bike listed here, send a copy of your dyno sheet data along with the other information listed in the Horsepower Gallery to us at the V-Twin Café.

Max Torque Engine Case CID Heads Camshaft Carb Pipes Owner Bike From
61 71 S&S 84 78 HD Crane 300H S&S Super E Drag Pipes with baffle Barry Linden 98 Special HD Ft. Worth
72 84 HD 88 STD Andrews BH CV SuperTrapp 2-1 Rich Comford 74 HD Cycle-Rama
78 88 HD 94 HD Andrews B Mikuni HSR-40 2" Python Drag Bernie Howard 74 HD HD Hampton, Newport News VA
94 88 HD 88 HD Baisley Redshift 550 S&S Super G 3 step drag pipes BaldButt Racing 74 HD FX Stegman Performance
Portland, OR
115 128 STD   STD Baisley Woods W9F S&S Super D w/thunderjet Thunderheader Rick Baldwin 74 FX Latus HD Portland, OR
132 126 STD 106 STD Baisley Red Shift .715 S&S Super D w/thunderjet 3 Step Drag Rick Baldwin 74 FX KBR's Custom Sandy, OR
89 104 Panhead 110 STD Panhead Sifton Python S&S Super B w/thunderjet SuperTrapp 2-2 Hakan Gudhe 77/64 Special Construction Mothers Engineering
Gothenburge, Sweden


Table of Contents
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Modification, Installation, Maintenance and Tuning Index  will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2

Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1  
TC95 128HP Stage 3
TC95 100HP Street
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam

Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

Shop Manual
Carburetor Troubleshooting
Finding Manifold Leaks
Cylinder Heads
Pistons and Cylinders
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc

Copyright 1997-2006  Stephen Mullen, Oldsmar, FL -+-