400 CID: 1970-1980

 

 

BORE:

4.126

 

BORE vs STROKE

STROKE:

3.750

BORE

STROKE

CRANKSHAFT

CID/Liter

DECK HEIGHT:

9.025

4.126

3.000

265/283/302/

320.7/5.2

DECK CLEARANCE:

0.025

4.126

3.100

262

331.4/5.4

COMPRESSION HEIGHT:

1.560

4.126

3.250

307/327

347.4/5.7

ROD LENGTH:

5.565

4.126

3.480

267/305/350

372.0/6.1

ROD RATIO:

1.480

4.126

3.750

400

400.9/6.5

ROD JOURNAL DIA.:

2.10

 

 

 

 

MAIN JOURNAL DIA.:

2.650

 

 

 

 

MAIN BEARING BORE DIA.:

2.841

 

 

 

 

 Introduced in 1970 this block differs from all other small blocks in many areas. Some of which are the use of a bigger bore, larger main bearing journals, longer stroke, shorter rods and siameased cylinder walls. This engine was dropped at the end of 1980. This block can safely be bored 0.030-inch, and a possible max bore of 0.060-inch.

 The four-bolt block was produced from 1970 through 1972 and the two-bolt block was produced from 1973 through 1980. The two and four-bolt blocks can be identified by the number of freeze plugs on the side of the block:

 2-bolt Main: 2 freeze plugs

 4-bolt Main: 3 freeze plugs

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