How much material is left on side walls after it is bored out?
Well it's machined out to fit the new sleeves, in one of the pics there's a stock 100" barrel and sitting to the left of it a sleeve, might give you some idea of the difference.
I'll call around to the workshop after the weekend and get an after pic to compare.
There's a fair bit of alloy coming out as you can see in the pic.
Mark, the engineer machinist mechanic wizard said it's very grainy alloy and hard to get a smooth finish with it.
He's gonna take at least 3 cuts to gradually get it down to an interference fit of 4.5 thou, least that's what I think he said.
You'll notice the sleeve is stepped to hold it in place too.
I once destroyed a Leyland V8 which are a 1962 Buick alloy engine, overheated it the day before when a hose blew. Then the next day I was driving it to the Gold Coast Indy Car race and gave it a huge rev and smoked up the tyres showing off.
Then BANG clatter clatter clatter!!!!
On post mortem pull-down it was revealed the block had been sleeved out to 308 cube but no step on the sleeves, the heat had shifted the sleeve downwards and when I gave it a big rev a ring slipped past the top of the sleeve and then tore the top clean off the piston!!!
That's why they're stepped, it's a very involved machining process, that's probably why you have to send your barrels in to Lloydz.
Thankfully they made an exception for us cos of distance and freight logistics and the fact I have a really good old school engineer doing the highly specialised job.
100" and 106" share the same bore size and pistons, the difference is in the stroke of the engines.
Same kit takes 100" to 109" or 106" to 116"