Rebuild after shot peen?
Have a skim cut on the surface to get a better finish. Make sure the shop doing them has the correct CBN cutters. Many shops don't. I hope the block surface doesn't look like that.
Shot peening does a number on machined surfaces. Double 0 beads polish as seen in the last photo. Put and aluminum block in a shot peen cabinet and see what happens, Iron block take more abuse but damage is still done.
One thing when a block is shot peened the main bearings and cam bearings should be left in so the surface is not affected unless you plan on line honed the cam and crank tunnels. I had a block done years ago before my son had his own shop . They took the bearings out and destroyed the surface. The block needed to be line honed in both cam and crank tunnels. Also the lifter bores should have rubber plugs put in. This is only for info you can use or ignore. Just what I have found from experience.
The only reason my son has his own shop is we were tired of machine shops destroying our race engines. Now he has more customers that he can handle. He learned what he knows from HTA machine after getting a job there who ended up doing our engines for our cars. HTA machine is one of the best shops in our area but getting out of race engine builds for walk ins without a past.
Its hard to find shops with manual Rottler bed mills. You cannot get them anymore they are all CNC. We bought the last two manual machines we found.
Have a skim cut on the surface to get a better finish. Make sure the shop doing them has the correct CBN cutters. Many shops don't. I hope the block surface doesn't look like that.
Shot peening does a number on machined surfaces. Double 0 beads polish as seen in the last photo. Put and aluminum block in a shot peen cabinet and see what happens, Iron block take more abuse but damage is still done.
One thing when a block is shot peened the main bearings and cam bearings should be left in so the surface is not affected unless you plan on line honed the cam and crank tunnels. I had a block done years ago before my son had his own shop . They took the bearings out and destroyed the surface. The block needed to be line honed in both cam and crank tunnels. Also the lifter bores should have rubber plugs put in. This is only for info you can use or ignore. Just what I have found from experience.
The only reason my son has his own shop is we were tired of machine shops destroying our race engines. Now he has more customers that he can handle. He learned what he knows from HTA machine after getting a job there who ended up doing our engines for our cars. HTA machine is one of the best shops in our area but getting out of race engine builds for walk ins without a past.
Its hard to find shops with manual Rottler bed mills. You cannot get them anymore they are all CNC. We bought the last two manual machines we found.