S&S Cycle 910-0844 129in. Big Bore Kit - Wrinkle Black without Highlighted Fin engine 1986-1990 Harley Davidson FLST Heritage

1986-1990 Harley Davidson FLST Heritage Softail

2009-2011 Arctic Cat Prowler XTX 700 H1 EFI

Fit directly in stock crankcases with no modifications

2014-2017 Arctic Cat Wildcat 4X

2012 Arctic Cat 450i

S&S Cycle 910-0844 129in. Big Bore Kit - Wrinkle Black without Highlighted Fin engine 1986-1990 Harley Davidson FLST HeritageThese S&S Big Bore Kits are made to take your 107in. M8 up to 129in. and your 114in. M8 up to 132in. If paired with the S&S Stroker Crank you can take your 114in. up to 136in. 136in. kits must be used with S&S stroker flywheels (P N 503293) to achieve the 136in. displacement. Wrinkle black finish. Available with or without highlighted fins. Original engine serial numbers are retained. MLS (multi layered steel) head gaskets. Retains stock engine