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The HDPC shop journal

Engine guidance and news from the shop.

Head Flow Numbers Explained: What CFM Ratings Do (and Don’t) Tell You

If you’ve ever shopped cylinder heads and gotten hypnotized by a big CFM rating, you’re not alone. Head flow numbers do matter—but they’re not a magic “more CFM = more horsepower” cheat code. They’re one piece of a much bigger puzzle that includes valve lift, port velocity, test pressure, the intake/exhaust you’re actually running, and […]

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Port Volume vs Velocity: Picking Heads That Drive Well on the Street

If you’ve ever bolted on “bigger” heads and ended up with a lazier engine, you’ve already met the real street dilemma: port volume vs velocity. On the street, you don’t drive at peak horsepower—you live in the midrange, where air speed and signal strength make torque, throttle response, and smooth drivability. The right cylinder head […]

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Resurfacing Changes Compression Ratio: How Much Power (or Risk) Are You Adding?

When a head gets resurfaced, most people think “good—flat again, better sealing.” True. But here’s the part that sneaks up on builds: resurfacing changes compression ratio, sometimes enough to add power… and sometimes enough to add detonation, heat, and expensive mistakes. This guide breaks down how much compression you’re really adding, what the typical power […]

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Choosing the Right Head Gasket Thickness After Machining

Machine work is supposed to save an engine build—not quietly sabotage it. But the moment a shop resurfaces your cylinder head (and sometimes the block deck), your head gasket thickness after machining stops being a “order the same part number again” decision… and becomes a critical measurement that affects: Compression ratio Quench/squish clearance Detonation margin […]

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Pre-Ignition and Detonation Damage: How It Beats Up the Cylinder Head

Pre-ignition and detonation damage is the kind of problem that doesn’t just “make noise”—it beats up your cylinder head like a hammer inside the combustion chamber. One minute you’ve got a faint rattle under load, the next you’re chasing low compression, misfires, coolant loss, or a head gasket that won’t stay sealed. Here’s the key: […]

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Cam Cap Mix-Ups: The Silent Cylinder Head Killer After DIY Teardown

If you’ve ever torn down a cylinder head at home, here’s the ugly truth: cam cap mix-ups are one of the fastest ways to turn a “simple reseal” into a full-on cylinder head replacement. The engine might even start… but the damage is already underway—cam binding, wiped journals, oil starvation, metal in the system, and […]

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Combustion Chamber Deposits: When Carbon Buildup Mimics Cylinder Head Failure

If you’ve ever chased a “bad cylinder head” diagnosis—only to find nothing cracked, warped, or leaking—you’re not alone. Combustion chamber deposits (carbon buildup on pistons, chamber surfaces, and sometimes valves) can create the same ugly symptoms you’d expect from real cylinder head trouble: misfires, knock/ping, rough idle, loss of power, even scary compression readings. The […]

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Head Bolt Stretch and Reuse: When New Bolts Are Non-Negotiable

Introduction If you’re gambling on head bolt stretch and reuse, you’re not just “saving money”… you’re risking the entire sealing system between the block, head gasket, and cylinder head. Head bolts aren’t just fasteners—they’re spring-loaded clamps. Get the clamp load wrong and you can end up with coolant leaks, oil contamination, low compression, warped heads, […]

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Cylinder Head Straightening: Myth, Method, or Money Pit?

Introduction Cylinder head straightening gets talked about like a magic trick: “Just heat it, clamp it, and it’ll be fine.” Sometimes that’s true. A lot of the time, it’s a fast lane to wasted machine-shop bills, repeat head-gasket failures, or a head that looks flat until it’s torqued and heat-cycled. So let’s cut through the […]

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