Boring an engine involves using machines to widen and taper the cylinders. From a performance standpoint, boring an engine could give you more horsepower and torque, as it will change the engine’s displacement. Engine displacement refers to the swept volume of all pistons inside the cylinders of an engine.

030″ over, and a . 030″ bored 350 is actually 355 cubic inches.

It means that the cylindar has been bored 0.030 or 0.060 over size in inches. If you look at a foreign car the over size measurements are in mm and are smaller. jmayer , 03-12-2004 12:13 PM.

a 350 bored . 030 over has a bore of 4.030.

a . 030 over 454 gives you approximately 460 cubes.

How to Convert a 350 Into a 383 Stroker

1. Purchase and install a 383 stroker crankshaft, rod and 10.5-to-1 piston set.
2. Install a set of four-bolt steel main caps over the center two crankshaft mains if you’re using a two-bolt-main block.
3. Install a set of ported L31 Vortec cylinder heads.

Most SBCs can go 30-over easy, 40-over most of the time, and 60-over some of the time, like Eric said. A 350 is not an underbored 400. If you try to go with a . 125″ overbore on a 350 to make a 400, you’ll hit water.

How much does it cost to have a 350 rebuilt? $600 to $3,500 depending upon how involved you want to get with the thing. Generally, for a “good” rebuild that doesn’t really get beyond ‘mild 350’ standards, you’re looking at about $1,600-2,500 depending upon location.

A good bore job around here costs $40 to 50 per hole for 4 stroke, and $50-60 per hole for a 2 stroke (2 strokes are more because of the time required to chamfer the ports).

A typical engine rebuild is between $2,500 and $4,000 in parts and labor costs. This type of engine repair might include simply replacing bearings and seals, and obviously taking the engine out and re-installing it. It could be much higher too.

BES Machine Shop Services

The hot tank, pressure testing, and the Magnaflux test cost about $105 to $130. If the mains need to be align-honed (bored), add $180. Decking the block runs about $180.

How much does a valve job cost on a v8? On newer engines (V6 or V8), a valve job can cost up to $125 per valve that needs repairing, with the cost increasing for engines with over 12 valves. Therefore, a total valve job can cost upward of $1000.

For example, a bare block job can be in the $250 to $500 range, while an assembled engine can range anywhere from $800 to as much as $1,500. According to IBoats.com, reboring boat engines can cost $45 to $50 per cylinder.

Resleeving is anywhere from $800 to $1200 depending on what kind of sleeves you get and where you go.

The usual cost for the honing or boring of the mains is $180. Once the mains are align-bored or honed, the centerline of the crankshaft is established. Next, the block is decked.

030-. 040 is the safe maximum. Some 4″ blocks (302, 327, 350) can be cut up to . 060 over, but you might run into wall weakness and overheating issues on a street application – “the rabbit hole gets deep” – there are some exotic oversizes available for a 350 (.