This is a seriously bad idea, getting them back in correctly and properly would be a nightmare.
You can sand blast them with the baffles in. Once you are done blasting you just have to VERY VERY thourghly clean and re-clean them out until you are 100% certain you got every grain. Done it myself more than a few times.
Air blast, tons of water, air blast, tons of hot water, repeat. Hot water with a little soap gets all the old gunky oil outa there anyways which isn't such a bad things anyways.
A bigger concern is be sure you don't blast along the sealing edge too much. Depending on how powerful the sandblaster your using its. But it's still decently forgiving bacause the cam seal gasket is thick and forgiving if they are newish anyways.
I recommend the pure glass bead for blasting because is doesn't dig deep into the aluminium esily and it also seems to bring out the brightness of the aluminium (not true aluminium, I believe its a hybrid aluminium/magnesium casting)
Something I just discovered works really well today that I have not seen mentioned anywhere before is using shortening for blasting. Takes way longer but since shortening is essentially fossilized ground up shells almost the consistency of ising sugar it leaves the metal looking literally like it's brand new and never been installed.
Downsides are your blaster and air compressor have to really be able to put out the air and material. I sandblast in a sealed box and sorta reach into the box through rubber glove like access.
If you do try the shortening for blasting abrasive (and trust me it is really abrasive, just very fine) be certain you WEAR A DECENT BREATHING MASK! It's really bad for your lungs but other than that it's totally inert and harmless. In fact it is used for vetrenarian uses in animals to get rid of worms or other itestinal bugs. The bugs eat the shortening as it passes through the animals system and shreds and kills the worms or whatever and doesn't harm the animal.
I put a little bit on ant hills in the summer and the bugger take it down to the queen and within 2 days the ants are totally gone without any use of poison of anytype.
I just gave it a try today because I got a huge box of the food grade stuff in a auction I was the winner bidder of. I have 30Kg of the stuff now. I have also mixed it with water and soap when I have needed a slight abrasive action when hand cleaning parts.
It also has some kinda use for deep fat fryers but god if I know, but it may be cheaper to source through a kitchen of some type.
Good luck, there's my 10 cents worth though.
