Chevy Specs for all

Computing Displacement

(Example = 350ci)  .7854 = Constant   To get .7854 simply divide pi by 4.

DISPLACEMENT= .7854 X (bore X bore) X stroke X number of cylinders

DISPLACEMENT= .7854 X (4.00 X 4.00) X 3.48 X 8

DISPLACEMENT=  349.849 rounded to 350 cubic inches

      Factory Displacements
Displacement

Year

 Bore Stroke

262

'75-'76

 3.671

3.10

265

'55-'56

3.75

3.00

283

'57-'67

 3.875

3.00

302

'67-'69

4.00

3.00

305

 '76-present 3.736

3.48

307

'68-'73

 3.875

3.25

327

'62-'69

4.00

3.25

350

 '67-present

4.00

3.48

400

'70-'80

 4.125

3.75

Compression Ratio's

Note: cutting deck height by .010 will change Compression Ratio by .28. (i.e. If compression is 9.35:1 on a 76cc head.  Cutting deck height by .010-inch would pump the compression up .28 to 9.63:1)

                      Combustion Chamber Volume

64

68

72

76
PISTON -22

8.49

8.20

7.92

7.67

(cc's)

 -13

9.26

8.90

8.57

8.27

-6

9.97

9.55

9.17

8.81

0

 10.69 10.20

9.76

9.35

3

 11.09 10.56 10.08

9.65

11

 12.35 11.68 11.09

10.56

13

 12.72 12.01 11.38

10.82

This chart is based on a 4.030 bore and 3.48 stroke w/ a .015 deck height and .038 thick head gasket

Just a little extra something

Head Weight (lbs)
Iron Production

44
Iron Bow Tie

46
Aluminum Corvette

19
Aluminum Brodix -8

22

Torque Specs(small block)

Part ft-lbs
Main Caps

30 / 50 / 70*
Connecting Rods

40
Heads

25 / 45 / 65
Manifold

15 / 30
Rocker Studs

50 &

* - On four bolt mains, outer bolts are tightened to 65ft-lbs.

& - With threadlock

Footnote: # / # / # means to torque in steps