god, some of you are dumb. i shouldn't have to spell everything out, we all know about reducing the chances of flow reversal and the step helps scavenging - so your saying you will have the header and gasket different sizes - have a day off. now who's the silly one - who cant read. another point - your average installer wont know to centre the header and gasket and just rest it on the studs (i use drill bits to centre the bolt hole on the stud) before tightening, if you only enlarge by 1mm................. think about the rest of the sentence or do i have to fill all the gaps
sorry better stick to the threads you can handle - which cai should i get, its been 2 threads since someone asked ;)
we can all be smart sheilas.