gaskets and bolts
Also, i saw something on Horsepower TV about new blocks, that you need to re-thread the holes before you put in the head bolts, is that true, and what do I need to do?
I don't understand what you mean by 'expanding bolts'?
On new engine parts, especially heads and blocks, because of all of the intricate passages where metal and debris can hide it's always a good idea to use a cleaning tap in the bolt holes and blow out all of the passages.
where can I get a cleaning tap and what size is needed?
where can I get a cleaning tap and what size is needed?
So, you could use stock fasteners to hold the heads on the block as long as you didn't torque them and then use later upon final assembly when they would be torqued.
Clear as mud?

