left: new cylinderhead, '87 XR3i MFI, skimmed and ported
right: old cylinder head, '82 RS1600i, round exhaust ports




MFI cylinder head with a set of new RS1600i inlet and exhaust valves, lightweight valve spring retainers and new valve stem seals




Injector sandwich plate mounted. Adapted it to the inlet ports. I tried to get rid of any edges to improve gas flow.
I also put in the camshaft and the rocker cover studs.