James Gasket Kits for Top End: Evolution Big Twin
Include all gaskets for top end overhaul.
- Gasket kit by James Gaskets
- for Cylinder head
- fits Evo Big Twin 1984-1991
- rubber / copper / steel / silicone, with rubber rocker cover gasket and MLS head gaskets 0.040”
- nominal bore: 3-1/2 ”
- replaces Harley-Davidson part number HD 17033-83
- USA
- gross weight: 320 g
James MLS Gaskets
Head gasket with Multi-Layer-Steel technology, i.e. 2 thin FKM-coated spring steel layers enclose an inner steel layer.
Thin Head Gaskets
An easy way to increase compression ratio a tad is to install thinnner head gaskets. A snappier exhaust note and a more efficient combustion can be expected.
Example: using a .030" head gasket in lieu of a .045" will increase compression by approx. 0.25 points. So if your CR with a .045" head gasket is 9.6, the static CR will increase to 9.85 with a .030" head gasket. Valve to piston clearance must be checked where appropriate.
Have any questions?
Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com