Originally Posted by
doga-ot
Blacktop head has better flow also blacktop block is better than a silvertop, in NA form differences are minimal however when you go turbo route the differences come about thats why when uou look more silvertops go bang than blacktops which is down to oil pump failure caused by crank flex. Oil filling doesnt really matter other than obviously being easier to fill being near pulleys
Wrong, on just about everything you've written.
Large differences on N/A, Silvertops aren't suited to high revving because of the hydraulic lifters.
Oil pump failures are pot luck, as has been said, it's generally believed to be the resonance created by high revs.
IIRC, Silvertops were first introduced in mk5 Escorts, RS1800 Fiestas and mk1 Mondeos. Blacktops were introduced with the Focus I think. Not 100% on that though!