---
title: How to Calculate Top Deck Clearance and Engine Dimensions for Custom and Motorsport Builds
description: Learn how to calculate block height, crank stroke, rod length, and piston clearance to choose the right parts for performance engines.
---

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# How to Calculate Top Deck Clearance and Engine Dimensions for Custom and Motorsport Builds

## Learn how to calculate block height, crank stroke, rod length, and piston clearance to choose the right parts for performance engines.

### Top deck clearance

 

 

Here we show how to calculate the following:

1. **Block height**
2. **Crankshaft stroke**
3. **Connecting rod length**
4. **Piston compression height**
5. **Piston to top deck distance**
6. **[Download calculator](https://info.speedingparts.eu/hubfs/Block%20deck%20clearance.xlsx?hsLang=en)**

This is basic information for choosing the right engine components.

You can easily input your own values below to get a result. Keep in mind that small deviations in measurements can lead to large deviations in function later on. Therefore, make sure to enter the correct measurements!

For example, a block may be top-decked (shaved), which should be included in the calculations of block height for an accurate calculation.

 

 

### **1** ▼

#### Block height

![](https://www.speedingparts.com/image/32733/Engine-parts-calculation-diagram.png)

**Calculate block height:**

(Crankshaft stroke / 2) + Connecting rod length + Piston compression height + Block deck clearance (if the piston sticks above the deck height, subtract this value instead to get block height)

 

 

### **2** ▼

#### Crankshaft stroke

![](https://www.speedingparts.com/image/32733/Engine-parts-calculation-diagram.png)

**Calculate crankshaft stroke**

Block height - Piston compression height - Connecting rod length - Block deck clearance (if the piston sticks above the deck height, add this value instead to get the crankshaft stroke) = **Half of the crankshaft stroke** (x2 to get the full crankshaft stroke)

 

 

### **3** ▼

#### Connecting rod length

![](https://www.speedingparts.com/image/32733/Engine-parts-calculation-diagram.png)

**Calculate connecting rod length**

Block height - (Crankshaft stroke / 2) - Piston compression height - Block deck clearance (if the piston sticks above the deck height, add this value instead to get the crankshaft stroke) = **Connecting rod length**

 

 

### **4** ▼

#### Piston compression height

![](https://www.speedingparts.com/image/32733/Engine-parts-calculation-diagram.png)

**Calculate piston compression height**

Block height - (Crankshaft stroke / 2) - Connecting rod length - Block deck clearance (if the piston sticks above the deck height, add this value instead to get the crankshaft stroke) = **Piston compression height**

 

 

### **5** ▼

#### Piston to top deck distance

![](https://www.speedingparts.com/image/32733/Engine-parts-calculation-diagram.png)

**Calculate block deck distance**

Block height - (Crankshaft stroke / 2) - Connecting rod length - Piston compression height = **Block deck distance up to or above the top deck of the block**

 

 

### **6** ▼

#### Download calculation

To easily calculate the above information, you can use our calculator, which will directly provide you with the data you're looking for.

[**Download here**](https://info.speedingparts.eu/hubfs/Block%20deck%20clearance.xlsx?hsLang=en)

 

 

### ▼

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