Twin Cam guides
4 GUIDES · EVERY NUMBER TRACES TO A PUBLISHED DYNO PULL
The simulator gives you a number. These pages explain where the numbers come from and what to do with them: what a stock 88 and a stock 103 actually put to the rear wheel, what one dealer's Stage 1 and Stage 2 did on the same bike, why lift matters more than duration on this two-valve head, and what each step of the big-bore ladder is worth.
What a Twin Cam Actually Makes: The Dyno Sheets from 88 to 117Real rear-wheel numbers — a stock 88, a stock 103, a 103 at Stage 1 and Stage 2 on the same bike, and a 117 Stage IV — with the exhaust, tuner, and correction factor on each.Stage 1 and Stage 2 on the Same Twin Cam 103: What Each Was WorthOne dealer, one Softail, one dyno — Stage 1 at 74.6 hp and 92.6 lb-ft, then S&S 583 cams for 78.3 and 100.7. Where the horsepower and the torque each come from, and why the tune decides it.Picking a Twin Cam Cam: Lift, Springs, and the Bolt-In LineWhy lift is the number that matters on a two-valve Harley head, where the bolt-in line is and why it exists, what the S&S 583 sheet says about torque cams, and how to read the shootout results.The Twin Cam Big-Bore Ladder: 88, 95, 103, 107, 117What each displacement step is worth, where the anchor sheets sit on the ladder, what a 117 Stage IV actually made, and when a cam beats a bore job.
Open the Twin Cam simulator