Black Highlighted-Screamin’ Eagle® Twin Cam™88 “HTCC” Cylinder Heads
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Click to enlarge photoThe Screamin’ Eagle® HTCC (High Torque Combustion Chamber) Cylinder Heads will be the cylinder head of choice for racers who love the feeling of torque. Item Number: 16933-99A
This item can STILL be ordered. Usually ships within 5 to 8 business days. Please expect 9 to 12 days for delivery.
This item can STILL be ordered. Usually ships within 5 to 8 business days. Please expect 9 to 12 days for delivery.
The Screamin' Eagle® HTCC (High Torque Combustion Chamber Cylinder Heads will be the cylinder head of choice for racers who love the feeling of torque. These heads have a high velocity "D-Shaped" intake port incorporating a step in the bowl area to minimize reversion. A large 2" intake valve enhances low lift air flow to promote higher torque at lower RPM's. This intake port requires the use of the HTCC Intake Manifold P/N 29634-00 for proper port match. The exhaust valve and port have also been redesigned. The exhaust valve has been reduced in size (as compared to the Screamin' Eagle® Twim Cam 88™ Performance Heads) from 1.623" to 1.550", and the exhaust port is now oval shaped to promote flow and improved exhaust scavenging. The uniquely designed combustion chamber utilizes multiple squish areas, which combine with the high dome piston to compact and excite the fuel/air mixture for a fast and efficient burn, with less possibility of detonation. Valve spring components are the same as used in the Twin Cam Performance Heads and can handle cams up to .575" lift and 6500 RPM. Separate purchase of 1550 Big Bore Cylinders, and HTCC Intake Manifold required for proper installation. Heads are machined to accept Compression Release Kit P/N 29298-02. FOR RACE APPLICATION ONLY. HTCC (High Torque Combustion Chamber) Cylinder Heads will be the cylinder head of choice for racers who love the feeling of torque. These heads have a high velocity "D-Shaped" intake port incorporating a stem in the bowl area to minimize reversion. New from the ground up, these heads have a high velocity "D-shaped" intake port incorporating a step in the bowl area to minimize reversion. A larger 2" intake valve enhances low lift air flow to promote higher torque at lower RPMs. The intake port requires use of HTCC Intake Manifold P/N 29634-00 for proper port match. Exhaust valve & port are redesigned. Exhaust valve is reduced in size (compared to SE Twin Cam Perf Heads) from 1.623" to 1.55" & the exhaust port is oval-shaped to promote flow & improve exhaust scavenging. The combustion chamber utilizes multiple squish areas, combining with the high dome piston to compact & excite the fuel/air mixture for fast & efficient burn, w/ less possibility of detonation. Valve spring components are the same as used in the Twin Cam Perf. Heads, & can handle cams up to .575" lift & 6500 RPM. For race application only.
Caution: Harley-Davidson® EFI systems will not compensate for any component changes. ECM must be recalibrated for proper installation. Failure to do so may result in engine damage. Calibration downloads for many component configurations are available at your Harley-Davidson® dealer, and many other component configurations can be calibrated using the EFI Race Tuner Kit P/N 32107-01A (Sold separately)
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Caution: Screamin' Eagle® Adjustable or Perfect Fit Pushrods are required for installation.
Caution: Harley-Davidson® EFI systems will not compensate for any component changes. ECM must be recalibrated for proper installation. Failure to do so may result in engine damage. Calibration downloads for many component configurations are available at your Harley-Davidson® dealer, and many other component configurations can be calibrated using the EFI Race Tuner Kit P/N 32107-01A (Sold separately)
Click icon for more information
Caution: Screamin' Eagle® Adjustable or Perfect Fit Pushrods are required for installation.
Fits 99-later Twin Cam models equipped with Big-Bore Cylinders. EFI models require ECM recalibration through applicable calibration cartridge or through EFI Race Turners Kit. See EFI Race Tuner Kit for fitment of calibration matrix for possible applications.
