Broach marks
 

Well I picked up my LT1 from the machine shop last week.... this is a new machinist I haven’t used before...regular machinist lost his lease. Anyway I made sure to stress no decking which he didn’t do. But since we are in California, a hot tank is hard to find so he solvent cleans the blocks and bead blasts them... this is where it goes bad!! I now lost my broaching marks. What would you guys do with that? Leave it alone? Its a pretty light dusting. I do have pictures of the deck while the engine was still together.

Some input would be great. Thanks.

Shit!!

That’s a new one.

Ryan W31

The broach marks are gone from bead blasting?


Jason

They might be under it. I haven’t really messed with it yet. I’m worried I’ll make it worse. But it definitely has that look when you blast metal and had that fresh blast looked. I’ll see about getting some pictures. It’s at my friends for reassembly.

If they didn't removed any material they are still there. Rub the area with a dirty finger and I bet you will see them.


Jason

Motorhead, that really sucks. Sorry to hear a story like that, and sure hope they’re still there.

Jason, LMAO... never heard of a dirty finger being a solution for anything before.

I'm assuming the assembly stamp is still there. Don't consider doing anything else aside from spraying some WD40 or something like that on the pad. Small blocks had more faint broach marks than big blocks, so leave it be. Don't try to recreate the broach marks, that induce more damage than good.

If it's just bead blasting under normal pressure the broach marks will still be there. If it was shot peen or heavy grit bead blasting under high pressure it may have distorted the peaks of it a little bit. However it really takes a concerted effort and setting the nozzle on one spot for quite some time to distort metal surface.