Silver top head has a problem if revvedover 8k where it does not ahve a secondry pulley tensioner to wrap the cambelt around the exhasut cam pulley further.

The black top head does have this.

The black top engine/bottom end runs a two piece sump set up.

I would go for a balck top engine or the st170 ideally but the silver top is by no means not an option, unless your wanting a seriuosly high revving race engine.


With the Black top engine now being more common in cars found in scrap yards, this is more desirable, a silver top engine typically will be seeing in 150K + mileage. so pretty old now