I'm very new to the classic Z scene and have gotten my hands on a cheap L24 block to cut my teeth on. The block was bored to 0.030" over by the previous owner - and from what I have gathered there are no pistons that come in this size. I have Googled this and have gotten some conflicting/nebulous information.

I was wondering if it is possible to bore the L24 0.120" over to take the standard L28 pistons?

Some posters have stated that an L24 block can not be safely bored over 0.080" as this would make the walls of the cylinders too thin. Others say there is no issue andthis has been done before.

Any chance for a clarification and a little guidance to a serious newbie.

Thank you!

Rockauto shows .030" over as available. RockAuto Parts Catalog

In general, I've heard that if you go outside recommended that you should have the remaining cylinder wall thickness measured. Some blocks can take it, some can't. But 0.120" seems way over recommended, I don't think that's possible.

Thank you for the info. This is my first build of any kind so I'm trying to get my dumb questions out of the way.

You should be able to find .040 over pistons for the L24. My engine is .040.

I would not consider l28 pistons, not enough block for that.

L28 engines can be found for a reasonable price and it would be cheaper then expensive machining costs.

Search- search and search again, it will save you tons of time and money.