bigtwin prodgroup Engine

Valve keeper key are split type for 1 engine. Set of four.FITMENT 1984 / 2004 FXST 1984 / 2004 FLT 1984 / 1994 FXR 1986 / 2004 FLST 1991 / 200...

Oversize exhaust valve seat is 1.713 X 1.379 X .400. Can be used with unleaded gas. Replacement size is actual size of seat. FITMENT 1984 / 1994...

Nitrate steel exhaust valve FITMENT 1984 / 2004 FXST 1984 / 2004 FLT 1991 / 2004 FXD 1986 / 2004 FLST 1984 / 1994 FXR ACCESSORY ITEMS16-1728

Cast iron .003 intake and exhaust valve guide Order correct lifter base screws in either (20) or (24) 1/4 pitch thread.FITMENT 1984 / 2004 FXST 1...

Cylinder stud insert only comes as 8 pieces. FITMENT 1986 / 1994 FXR 1991 / 1998 FXD 1986 / 1998 FLST 1986 / 1998 FLT 1986 / 1998 FXST ACCESS...

Evolution lower rocker cover mountain hardware set includes all correct bolts allen screws and washers necessary for bolting lower rock cover to c...

Rocker box breather element. FITMENT 1999 / 2017 FXST 1999 / 2017 FLST 1999 / 2017 FXD 1999 / 2016 FLT ACCESSORY ITEMS16-052916-074316-0585

Sifton rocker arm and shaft kit includes 4 rocker arms and 4 shafts. Kit includes bushings which are already sized to fit the shafts.FITMENT 1984 /...

Sifton rocker arm 4 piece shaft set for 1986-up. FITMENT 1984 / 2017 FXST 1984 / 2016 FLT 1984 / 1994 FXR 1986 / 2017 FLST 1991 / 2017 FXD 19...

Increase your stock 80 Evolution engine with our big bore cylinder to 88 cubic inches. This is 3-5/8 black cylinder will have to be honed for fi...

Increase your stock 80 Evolution engine with our big bore cylinder to 88 cubic inches. This 3-5/8 silver cylinder will have to be honed for fina...

Sifton tappet and pushrod assembly includes 4130 chromoly pushrods with black oxide finish 4 solid tappets 2 chrome tappet blocks chrome allen s...

Sifton tappet and pushrod assembly includes 4130 chromoly pushrods set with black oxide finish 4 hydraulic tappets and chrome tappet blocks with c...

Replica 80 black Evolution cylinder is sold each. Cylinder has glossy black finish with polished fins. Piston and rings are not included. 3.499 f...

95 Big Bore piston kit is .005 oversize for TC-88 models. Kit includes rings clips pins and 10.25:1 cast flat top pistons. Order gasket set sepa...

95 Big Bore piston kit is standard size for TC-88 models. Kit includes rings clips pins and 10.25:1 cast pistons. Order gasket set separately. T...

Replacement 80 Evolution piston kit. Pistons are .040 over size. Our kit includes 2 cast alloy pistons Hasting ring set wrist pins and circlips....

Replacement 80 Evolution piston kit. Pistons are .030 over size. Our kit includes 2 cast alloy pistons Hasting ring set wrist pins and circlips....

Replacement 80 Evolution piston kit. Pistons are .010 over size. Our kit includes 2 cast alloy pistons Hasting ring set wrist pins and circlips....

Replacement 80 Evolution piston kit. Pistons are .005 over size. Our kit includes 2 cast alloy pistons Hasting ring set wrist pins and circlips....

Standard piston ring set per piston. Sold per piston.FITMENT 0 / Replacement per pistonTECH NOTESSuggested to use with #11-0287 piston setACCESSO...

Standard piston ring set FITMENT 0 / Replacement for piston setTECH NOTESSuggested to use with #11-0286 piston kitACCESSORY ITEMS16-062816-06221...

Forged piston set has a compression ratio of 10.5:1 and is for a stock stroke. Set includes rings circlips and pins. **Note:Run engine at moderate...

95 Big Bore piston kit is standard size for TC-88 models. Kit includes rings clips pins and 9.3:1 moly coated cast flat top pistons. Order gaske...