I had another thought that may help with fighting warpage. If possible bolt it down to a large flat plate And leave it bolted till completely cool I did that a few months back with a cast intake manifold for a Mercedes and had great results. Mind you I already had a big plate at the shop with holes...

Concerning cleaning: I’ve had to remove a slight crown in the casting where the work will be and I’ve done that with a burr. The hope there is that it’s down to clean metal now, but I’ll still wire brush and acetone.

Thank you for the great tips. I’ll definitely take some pre and post bore measurements and cross my fingers, if necessary I’ll have it replated and honed afterwards. Hopefully it won’t come out of flat on the deck either. Time to dive in! I’ll do a test on a scrap cylinder to dial in settings for ba...

I’ve got an oxy setup and a rosebud. Great idea. Just don’t want it to get out of control. I’ll practice in a junk cylinder first. Thanks

Hey everybody, I’m looking to change the coolant spigot location on this cast aluminum motorcycle cylinder. I would like to be sure to not change the critical dimensions of the cylinder(warp) and I’m thinking preheat is a good idea. What kind of torch should I use? And also how hot should I preheat?...

Greetings all, glad to have signed up. I've learned so much from this site and thought it's a good idea to become part of the forum. I'm only a few years in to my welding practice as a hobbyist but I'm really enjoying everytime I get the chance to spark up on something. My hobby is building,riding a...