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3-7/8" Standard Bore
When combined with stock cylinder heads, these forged 3-7/8" pistons boost the compression ratio of your 3-7/8" big bore cylinder set-up.
- The combination results in a compression ratio of 10.5:1
- Piston skirts feature a unique black coating for improved wear-resistance, better fit and reduced noise
- These pistons include Titanium SST rings to withstand the stresses seen in racing
- Complete kit includes pistons, rings, wrist pins and clips
Note
Fits Harley-Davidson '07-later Twin Cam models equipped with 3-7/8" cylinders. Does not fit Twin-Cooled models. All EFI models require ECM calibration* (priced separately). For race application only.
