I have several 340 & 360 blocks in service as strokers. 4, actually. All required between 1 and 3 sleeves to be passable by my standards. None have any issues with power or longevity.
I'm curious: were the 360 blocks early castings, ie 3418496 castings produced from 1971-74 and sharing the same metal as the 340s?
My 3418496 360 is already .030" over. Just spoke to a guy last week who has an early 360 block .100" over (equivalent to a .060" over 340), and after sonic testing he still had .150" left on the thinnest side.
I read another of your posts where you believe the 340/360 castings only applied to the 1971 blocks. Did you compare 3418496 castings from different years to discover this?
The reason I'm curious is because I'm planning on taking out my 360 to +.060" and everything I've read - from Shepherd to Szilagyi - all state the early casting 360s are the same as the 340s. That also tends to be our experience with them.
The biggest problem is probably their age and the potential for water-jacket corrosion.
