There is a Dart Sportsman block on Craigslist right now and it looks like he is willing to take a loss on it. It has never been assembled or machined, but I could have a finished short block for less than what the parts for the Dart block would cost. I really dont think that I would need this block but it is fun to imagine... I have a friend that is determined to set me up with forced induction, but that wouldnt be anytime soon... The rotating assembly in the ad has a 4.030 bore. Isnt it a 4.125 bore block? https://oklahomacity.craigslist.org/...265220191.html
Using the part # in the ad,the block currently sits with a 4.000" bore.You would have to get a machine shop to bore it 0.030" over,in order to use the rotating assembly listed.If you were to leave the block as it sits now and install the crank & rods with the kit + buy pistons to match the 4.000" bore,you would have a 327ci engine.
If you bore the block 0.030" over and use all of the components listed in the ad,you would have a 331ci engine.Eventhough the block is at 4.000" now,it can be safely bored to 4.125" to increase ci.
If you were to bore the block to 4.125" and use the crank & rods from the kit listed then buy pistons to match the new 4.125" bore,you'd have a 347ci stroker.If you swapped the 3.25" stroke crank with a 3.40" stroke crank,you'd have a 363ci engine.
BTW- most 302 blocks can only be bored to 4.060",but its not safe to go above 4.040" due to their thin cylinder walls.Overheating can occur above a 0.040" overbore.The Dart block has alot more metal,4 bolt mains,etc which safely allows it to be bored more.
You can use the following formula to calculate ci displacement:
B=bore S=stroke Pi=0.7854 N=# of cylinders
B (x) B (x) S (x) Pi (x) N= ci displacement
4.000 x 4.000 x 3.25 x 0.7854 x 8= 327ci
4.030 x 4.030 x 3.25 x 0.7854 x 8= 331ci
4.125 x 4.125 x 3.25 x 0.7854 x 8= 347ci