I have a 305 sbc I just bought and I'm gunna build it and put it in a 240sxI took the motor apart and removed the pistonsMy plan is to bore out the cylinders and obviously install bigger pistonsNow I took a look at the cylinder walls and they are in pretty good shape but I'm still going to bore it outI have been in the import game for a while now and I know that they mostly all have cast aluminum blocks and they use steel cylinder sleevesMy 305 is a cast iron blockSince its cast iron block, does it have sleevesThe only reason I ask is when I bore the motor, am I going to have to install sleeves as in a Honda? Long story shortDoes a older cast iron v8 block have cylinder sleeves or no.
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NoNo sleeves in the gen 1 small block or big block chevy V8 engines(thats 262, 265, 267, 283, 302, 305, 307, 327, 350, 400 small block or 348, 366, 396/400/402, 427, 454, 502 big block) The max over bore one a small block is only 0.060 and only about half of then will go to thatI sonic test all blocks after .030 to make sure they have enough wall thickness to go to .040 or .060 over Keep in mind, boring does NOT make powerYou might gain 5 to 10 HP at bestBoring is done to true up and clean up the cylinder walls The 305 is not the 8 for performance useIt's bores are too small to breath up higher in the RPM bandA 4.000 bore engine like the 350, 327, 302 is a much better base to start with And before you ask, no you can not bore a 305 out to a 350 or a 4.000 bore size.
