RM351 203 Posted March 27, 2024 I was doing a closer inspection on the crankshaft and I've noticed 6 small unusual holes on the journals. This from a late Cleveland block, is this something they did at the factory or from a previous engine owner and what would be the point of this? The journals are all standard size. 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
RM351 203 Posted March 28, 2024 Anyone? 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
deankxf 20,824 Posted March 28, 2024 16 minutes ago, RM351 said: Anyone? @Thom may have an idea? 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
Thom 6,701 Posted March 28, 2024 [mention=43]Thom[/mention] may have an idea?Could be an improperly done brinnel (hardness) test 4 deankxf, RM351, bear351c and 1 other reacted to this Share this post Link to post Share on other sites
CHESTNUTXE 7,636 Posted March 29, 2024 that is definatly an x file,maybe something was dropped on it or slightly dented the crank and someone did a small drill to smooth it out ? dont think its going to affect a std engine,just for a talking point DJ used to use a tiny drill bit on his forged pistons if they developed a crack so it would not go any further ,just goes to show how much of a budget the team was on in the early days. 1 RM351 reacted to this Share this post Link to post Share on other sites
RM351 203 Posted March 29, 2024 Ok thanks guys I'm taking it to a machinist soon, a little worried he would say "bin it". If that happens it's going to be fun finding a decent crank for a good price. Share this post Link to post Share on other sites
gregaust 330 Posted March 29, 2024 Then it's time for a stroker crank 2 1 bear351c, RM351 and CHESTNUTXE reacted to this Share this post Link to post Share on other sites
RM351 203 Posted March 29, 2024 1 hour ago, gregaust said: Then it's time for a stroker crank I've jumped the gun a bit, already bought a set of pistons to suit. Most stroker kits sell with .030 size pistons I need .020 size ones so I'll need to buy in bits. 1 CHESTNUTXE reacted to this Share this post Link to post Share on other sites
bear351c 10,395 Posted March 31, 2024 Looks like a Brinnel hardness test gone wrong, as Thom said, and someone didn't use sleeves over the rod bolts when installing the pistons. (Small chatter marks). The crank should be OK if it was in a running engine, it would have failed by now for sure. Just need to make sure there are no sharp edges around the dents, use a 5 or 6 mm drill bit BY HAND, and slower chamfer the 'holes' then linish the journals with some emery tape etc. 2 RM351 and CHESTNUTXE reacted to this Share this post Link to post Share on other sites
RM351 203 Posted April 2, 2024 Ok, end up taking the crank to the machinist said those holes were strange but said wont be an issue. Crank getting a grind and balancing done. Just glad there's no need for a replacement. 3 1 gregaust, CHESTNUTXE, bear351c and 1 other reacted to this Share this post Link to post Share on other sites
