400 [1970-1980]

400 CID: 1970-1980

BORE:

STROKE:

DECK HEIGHT:

DECK CLEARANCE:

COMPRESSION HEIGHT:

ROD LENGTH:

ROD RATIO:

ROD JOURNAL DIA.:

MAIN JOURNAL DIA.:

MAIN BEARING BORE DIA.:

4.126

3.750

9.025

0.025

1.560

5.565

1.480

2.100

2.650

2.841

BORE vs STROKE

BORE

STROKE

CRANKSHAFT

CID/Liter

4.126

4.126

4.126

4.126

4.126

3.000

3.100

3.250

3.480

3.750

265/283/302

262

307/327

267/305/350

400

320.7/5.2

331.4/5.4

347.4/5.7

372.0/6.1

400.9/6.5

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:

4-bolt Main block has 3 freeze plugs

2-bolt Main block has 2 freeze plugs

400 CID: 1970-1980
BORE: STROKE: DECK HEIGHT: DECK CLEARANCE: COMPRESSION HEIGHT: ROD LENGTH: ROD RATIO: ROD JOURNAL DIA.: MAIN JOURNAL DIA.: MAIN BEARING BORE DIA.:			4.126 3.750 9.025 0.025 1.560 5.565 1.480 2.100 2.650 2.841
BORE vs STROKE
BORE	STROKE	CRANKSHAFT	CID/Liter
4.126 4.126 4.126 4.126 4.126	3.000 3.100 3.250 3.480 3.750	265/283/302 262 307/327 267/305/350 400	320.7/5.2 331.4/5.4 347.4/5.7 372.0/6.1 400.9/6.5