COMPRESSION vs CHAMBER VOLUME :

CID

LITER

BORE

STROKE

262

4.30

3.671

3.100

265

4.34

3.750

3.000

267

4.39

3.500

3.480

283

4.64

3.875

3.000

302

4.94

4.001

3.000

305

5.00

3.736

3.480

307

5.02

3.875

3.250

327

5.36

4.001

3.250

CHAMBER

CR

CR

CR

CR

CR

CR

CR

CR

58.3

60.1

62.0

63.0

64.0

66.0

70.0

76.0

9.0

8.8

8.6

8.5

8.3

8.2

7.7

7.5

9.1

8.9

8.7

8.5

8.3

8.3

7.8

7.2

9.3

9.1

8.8

8.7

8.5

8.4

8.0

7.4

9.6

9.3

9.1

9.0

8.8

8.7

8.3

7.6

10.1

9.8

9.6

9.5

9.2

9.1

8.7

8.0

10.3

9.9

9.8

9.7

9.4

9.3

8.9

8.1

10.3

10.0

9.8

9.7

9.4

9.3

8.9

8.2

10.6

10.6

10.3

10.2

9.9

9.8

9.3

8.5

CID

LITER

BORE

STROKE

350

5.74

4.001

3.480

355 [A]

5.82

4.031

3.480

350 [D]

5.74

4.001

3.480

355 [A,D]

5.82

4.031

3.480

377 [B]

6.18

4.001

3.750

383 [C]

6.27

4.031

3.750

400

6.57

4.126

3.750

406

6.67

4.156

3.750

CHAMBER

CR

CR

CR

CR

CR

CR

CR

CR

58.3

60.1

62.0

63.0

64.0

66.0

70.0

76.0

11.6

11.3

11.0

10.9

10.5

10.4

10.0

9.0

11.7

11.4

11.1

11.0

10.6

10.4

10.1

9.3

9.2

9.1

8.9

8.8

8.7

8.5

8.2

7.8

9.3

9.2

9.0

8.9

8.8

9.6

8.3

7.9

11.9

11.6

11.3

11.2

11.1

10.8

10.3

9.7

12.0

11.8

11.5

11.3

11.2

10.9

10.5

9.8

9.7

9.5

9.3

9.3

9.2

9.0

8.7

8.3

9.8

9.6

9.4

9.4

9.3

9.1

8.8

8.4

NOTES:

[A] Bore .030-inch over size.

[B] 4.001-inch bore [350-block] / 3.750-inch Stroke [400-crankshaft]

[C] 4.031-inch bore [+.030 350-block] /3.75-inch Stroke [400-crankshaft]

[D] Dished Pistons.

[ ] Check clearance when using large valve heads on a small bore block.

[ ] Typical dish volume for 350-cid dished piston is 17 cc.

[ ] Typical dish volume for 400-cid dished piston is 24 cc.

[ ] Production tolerances may create chamber volumes as much as 2-1/2 cc difference.

  All compression ratios in this table were figured with:

Head Gasket 0.036-inch

Deck Clearance 0.020-inch

Flat top pistons unless noted.

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