# What is the compression height of a piston?

## What is the compression height of a piston?

Piston compression height is the distance between the centerline of the pin to the flat part of the top of the piston.

## How big can you stroke 400 SBC?

General Motors achieved the 400 SBC engine’s displacement by increasing the bore to 4.125 inches and the crankshaft stroke to 3.75 inches – actual displacement is just over 400.9 cubic inches. In contrast, the Chevy 350 CID engine uses a bore of 4.00 inches and a stroke of 3.48 inches.

What is piston deck height?

Deck height dictates many engine dimensions. It limits stroke, rod length, and piston compression height. This last dimension is a critical part of the rotating assembly equation and is defined as the distance from the wrist pin centerline to the piston deck.

What is the minimum piston to head clearance?

Since piston clearance plays such a big part in piston-to-head clearance, it is possible to run a piston-to-head clearance tighter than 0.040-inch if you feel brave. Noted horsepower hero John Lingenfelter says that clearances of 0.037 to 0.040 inch are possible, but you must know what you’re doing.

### How do you calculate the length of a rod?

Subtract the total length of the halved inner diameters and the metal wall on the ends of the rod from the total length of the connecting rod. This number will be the final measured length.

### Is a 400 small-block better than a 350?

A small block 350 and a 400 have an identical block design. Most accessories will fit either engine. The major difference is found in the casting numbers and the way they are balanced. Most 350 cubic inch engines are internally balanced whereas the 400 engines are not.

How much HP can a stock SBC handle?

A stock block can handle upwards of 500 HP pretty reliably. Some will do 600 pretty reliably, while other’s won’t. Can someone build an engine making more than 600 HP using a stock block and have it last?

How much clearance should a piston have?

Generally, you measure about 3/4″ up from the bottom of the skirt and you should have . 0035″ clearance or so. On the off chance you don’t know, those pistons are not stock spec, they are much higher compression.

## What’s the best compression ratio for a 400 SBC?

What’s the best way to achieve a moderate compression ratio around 10:25:1 on a 400 SBC? Is it better to use flat top pistons and a larger combustion chamber (74cc) in the head, or to use heads with average-sized combustion chambers (64) and dished pistons?

## How is the compression height of a piston determined?

Before selecting a piston, the desired compression height must be known. As shown, compression height is the distance between the centerline of the pin bore and the top of the piston. To determine the compression, three things about the engine must first be known: block height, connecting rod length and crankshaft stroke length.

How to calculate the compression height of a baseball block?

Compression height = block height – rod length – (0.5 X stroke) Example: block height = 11.685 : rod length = 7.500 : stroke = 5.500 : Compression height = block height – rod length – (0.5 X stroke) Compression height = 11.685 – 7.500 – (0.5 X 5.500) Compression height = 1.435

How tall is a Chevy V-8 compression block?

Stock Chevrolet V-8 Block Heights Displacement Cubic Inches Liters Deck Height (inches) 402 6.6 9.800 427 7.0 9.800 454 7.4 9.800 502 8.2 9.800