| Use a piston ring and a set of feeler gauges in the ring gap to measure at frequent intervals down each of the bores, your looking for variations within a bore and variations between bores.
If there are no variations at all, establish the current bore size by first measuring the diameter of a piston, putting it less it's rings into the bore and using the feeler gauges to measure the gap between the piston and the bore wall. Do this at a few points on each cylinder using the same piston each time.
Then you should have a fair indication that you need a rebore or perhaps just a cleanup and hone job. The block will need to be honed anyway if your going to be fitting new rings.
The machine shop you take it to will (should) perform their own assessment which you can compare to your findings to see if your plonker is being pulled.
Just rebuilding my second small block, this one came out of a boat. It smells of oil, stagnant salt water and strangely of fish.
__________________ Tojeiro De Dion The man from Dax say "It's within tolerance, you need a bigger hammer." |