ive got a 307 block out of a 86 olds cutlass supreme that im putin into a project car. i plan on borin it out and all that good stuff i was just wonder how big the block can be bored?

 

Is it an OLDS engine or Chevy?

 

that is what im not sure about,
ive looked up various parts from that car and a caprice (water pump, camshaft) and im gettin the same part numbers and every thing, the 307 is in the caprices and the pontiac periesienne so im pretty sure its a chevy block thats used for diff. vehicles

 

It's an Olds motor. A 307 at that. Doesn't matter how much you bore it, it's basically still a 307. Lamer than a Chevy 305 by far, and heavier, and a whole lot more trouble to swap in, unless it's going in a car that has a BOP trans already.

I believe .030" is about all you can safely go without checking for thin spots, like most motors of the same vintage.

 

im dropin in a s10, so it can only be bored .30 of its stock bored or .30 over of a 350 bore (4 in)

 

No, it can't be bored .30"; only .030" (30 thousandths); a long way from turning it into a 350. Much like a Chevy 305 and 350.

 

so basically i can do nothing to it as far as boring is involved

 

the only reason you would bore it is out of necessity, not to increase displacement. For example, rust in a cylinder, scored cylinder walls, out of round cylinder(s), etc. Any proformace gain from boring cylinders is very small if any, there are many other ways to make power.. unfortunetly those old's 307's really dont have a lot of aftermarket support.. and honestly in stock form they are the biggest iron turds I have ever seen..