Grant Pistons, .100 over for a 283?

I bought a set a set of Grant pistons from fellow hamber 'BostonCamaro' for my 283 and had the machine shop bore the block to the pistons that we thought were .060 over. Turns out they were .110 over according to the machine shop, but I noticed a marking under the piston says "100" --they have been coated though. I have not heard of a "299" sbc! Was this a normal sizing for these older forged aftermarket pistons?



Thanks!

 

Interesting. Subscribed!

 

some of the early 283's could be bored .125 over

 

Linky Duplicate Thread guys