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These cylinder heads are offered specifically as replacement heads for S&S® SB100 engines for 1986-'03 HD® Sportster models. Heads are machined with the S&S® 4" cylinder stud pattern and for S&S® electric or manual compression releases. Pushrod hole geometry is 1986-90 four-speed style. S&S® high lift valve springs are compatible with cams of up to .650" lift. The 85cc combustion chamber results in 10.3:1 compression in an S&S® SB100 engine. Natural aluminum finish.
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