Chevy 283 to 400 small block Chevy valve cover spacers in 6mm or 1/4" inch.
These are cut from billet aluminium plate on a CNC machine and should be used with a gasket in between for better sealing.
They will give extra height inside your valve covers when fitting roller rockers or taller valve train hardware.
Note we can supply spacers to suit early 283 off set rocker cover bolt valve covers that can be adapted to later cylinder heads.
These are spot drilled and require the drilling of 4 holes and tapping of 2 holes to convert them to be used as adapters.