265 CID: 1955-1957

 

 

BORE:

3.750

 

BORE vs STROKE

STROKE:

3.000

 

BORE

STROKE

CRANKSHAFT

CID/Liter

DECK HEIGHT:

9.025

 

3.750

3.000

265/283/302/

265.0/4.3

DECK CLEARANCE:

0.025

 

3.750

3.100

262

273.9/4.4

COMPRESSION HEIGHT:

1.800

 

3.750

3.250

307/327

287.1/4.7

ROD LENGTH:

5.700

 

3.750

3.480

267/305/350

307.4/5.0

ROD RATIO:

1.900

 

3.750

3.750

400

331.3/5.4

ROD JOURNAL DIA.:

2.000

 

 

 

 

 

MAIN JOURNAL DIA.:

2.300

 

 

 

 

 

MAIN BEARING BORE DIA.:

2.491

 

 

 

 

 

 Introduced in 1955 it is the first small-block. The 265-CID blocks had no oil filter nor provision for one. On early 265-CID blocks oil was feed to the lifter galleries through two holes in the rear camshaft bearing. Early blocks will stand boring 0.125-inch. One block produced around 1957 had slightly thicker cylinder walls, It can be identified by the letter "C" at the end of the engine serial number.

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