The intake runners were opened up and cut to a single runner setup along with the exhaust ports. ![]() My build goal was at least 450 whp to further benefit the effect of the CorkSport Mazdaspeed camshafts, so I had the cylinder head ported to improve flow.For this reason, I had the rotating assembly (crankshaft, connecting rods, pistons, clutch assembly, and crank pulley) balanced to further reduce vibrations. However, this does come with some compromises, mainly in severe NVH (noise, vibration, harshness) the driver experiences. This would remove some rotating mass to help the engine rev more freely. I planned to run without the balance shaft, commonly called a BSD (balance shaft delete), to increase the oil capacity of the oil pan.Since I wasn’t going for just a bare bones build, I opted to have some added processes done to help with reliability and performance. The block was bored and cross-hatched to match up with the pistons, the main bearing journals were line honed where needed, and the deck surface was cut down just a hair to provide a new surface that’s true and flat. The bare engine block, a new used cylinder head, ACT 6-Puck clutch, and forged internals were sent to M & B Cylinder Heads for some much-needed love. After all this, I didn’t trust the engine. Luckily, I didn’t vent the engine block in the process, so that could be reused. The engine slipped timing and bent all of the valves. That something turned out to be the friction washers on the crankshaft. A compression test gave me the quick, sad story. I called the tow truck and brought my Mazdaspeed back to CorkSport HQ. ![]() I was merging onto the highway, within the speed limit, when the engine went silent and my dashboard became a Christmas tree of lights. The moment we all dread (or maybe even look forward to?) finally happened … zoom zoom BOOM (ZZB). Whether you do or don’t understand what a built block is, I thought I would share my knowledge and experience through the engine building process for my 2009 Mazdaspeed 3. For you newbies, it’s when the engine internals are replaced with performance parts. In fact, you’ve probably heard it enough times that you don’t even notice it. You’ve probably heard the phrase “built block” lately on social media or at your local car meet, but you might be wondering what that actually means.
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