|
Small Block GM Specs
|
|
|
|
CI
|
Year
|
Bore
|
Stroke
|
Main Jnl
|
Rod Jnl
|
Main Cap
|
|
262
|
75-76
|
3.671
|
3.100
|
2.450
|
2.100
|
2 bolt
|
|
265
|
55-56
|
3.750
|
3.000
|
2.300
|
2.000
|
2 bolt
|
|
267
|
79-81
|
3.500
|
3.480
|
2.450
|
2.100
|
2 bolt
|
|
283
|
57-67
|
3.875
|
3.000
|
2.300
|
2.000
|
2 bolt
|
|
302
|
67
|
4.000
|
3.000
|
2.300
|
2.100
|
2 bolt
|
|
302
|
68-69
|
4.000
|
3.000
|
2.450
|
2.000
|
4.bolt
|
|
305
|
76-91
|
3.736
|
3.480
|
2.450
|
2.100
|
2 bolt
|
|
307
|
68-73
|
3.875
|
3.250
|
2.450
|
2.100
|
2 bolt
|
|
327
|
62-67
|
4.000
|
3.250
|
2.300
|
2.100
|
2 bolt
|
|
327
|
68-69
|
4.000
|
3.250
|
2.450
|
2.100
|
2 bolt
|
|
350
|
67-91
|
4.000
|
4.380
|
2.450
|
2.100
|
2&4 bolt
|
|
400
|
70-72
|
4.125
|
3.750
|
2.650
|
2.100
|
4 bolt
|
|
400
|
73-80
|
4.125
|
3.750
|
2.650
|
2.100
|
2 bolt
|
|
Gear Ratios
|
|
|
|
|
|
|
|
|
|
Saginaw 3 Speed
|
|
|
|
Lines
|
1st
|
2.nd
|
3rd
|
|
|
No
|
2.85
|
1.68
|
1.00
|
|
|
1
|
2.54
|
1.50
|
1.00
|
|
|
2
|
3.11
|
1.84
|
1.00
|
|
|
3
|
3.50
|
1.89
|
1.00
|
|
|
|
|
|
|
|
Saginaw 4 Speed
|
|
|
|
Lines
|
1st
|
2.nd
|
3rd
|
4th
|
|
No
|
2.84
|
2.01
|
1.35
|
1.00
|
|
1
|
2.54
|
1.80
|
1.44
|
1.00
|
|
2
|
3.11
|
2.20
|
1.47
|
1.00
|
|
3
|
3.50
|
2.47
|
1.65
|
1.00
|
|
|
|
|
|
|
Muncie 4 Speed
|
|
|
|
Lines
|
1st
|
2.nd
|
3rd
|
4th
|
|
No
|
2.56
|
1.91
|
1.48
|
1.00
|
|
1
|
2.20
|
1.84
|
1.28
|
1.00
|
|
2
|
2.52
|
1.88
|
1.46
|
1.00
|
|
|
|
|
|
|
|
|
|
|
|
Second Design T-10 (Super T-10)
|
|
Lines
|
1st
|
2.nd
|
3rd
|
4th
|
|
2
|
2.43
|
1.61
|
1.23
|
1.00
|
|
3
|
2.64
|
1.75
|
1.33
|
1.00
|
|
5
|
3.42
|
2.28
|
1.46
|
1.00
|
|
6
|
2.88
|
1.91
|
1.33
|
1.00
|
|
BBC Cubic Inch Chart
|
|
|
CI
|
Bore
|
Stroke
|
|
|
366
|
3.935
|
3.760
|
|
|
396
|
4.094
|
3.760
|
|
|
402
|
4.125
|
3.760
|
|
|
427
|
4.250
|
3.760
|
|
|
454
|
4.250
|
4.000
|
|
|
502
|
4.447
|
4.000
|
|
|
454 BBC Cubic Inch Chart
|
|
|
|
|
|
|
Bore
|
Size
|
Stroke
|
|
|
|
|
|
|
|
3.760
|
4.000
|
4.250
|
4.500
|
4.750
|
4.875
|
|
Stock
|
4.250
|
427
|
454
|
482
|
511
|
539
|
553
|
|
+.030
|
4.280
|
433
|
460
|
489
|
518
|
547
|
561
|
|
+.060
|
4.310
|
439
|
467
|
496
|
525
|
554
|
569
|
|
+.090
|
4.340
|
445
|
473
|
503
|
533
|
562
|
577
|
|
+.100
|
4.350
|
447
|
476
|
505
|
535
|
565
|
580
|
|
+.125
|
4.375
|
452
|
481
|
511
|
541
|
571
|
586
|
|
502 BBC Cubic Inch Chart
|
|
|
|
|
|
|
|
|
Bore
|
Size
|
Stroke
|
|
|
|
|
|
|
|
3.760
|
4.000
|
4.250
|
4.500
|
4.750
|
4.875
|
|
Stock
|
4.447
|
467
|
497
|
528
|
559
|
590
|
606
|
|
+.030
|
4.77
|
474
|
504
|
535
|
567
|
598
|
614
|
|
+.060
|
4.507
|
480
|
511
|
542
|
574
|
606
|
622
|
|
+.090
|
4.537
|
487
|
517
|
550
|
582
|
614
|
631
|
And for you LandSpeed Racers
|
|
|
|
|
MPH
|
= (RPM * Tire Diameter) / (Gear Ratio * 366)
|
|
|
tire=
|
28
|
|
|
|
|
|
|
|
|
|
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|
RPM
|
|
|
|
|
|
|
6000
|
6500
|
7000
|
7500
|
8000
|
8500
|
9000
|
9500
|
10000
|
|
3.5
|
131.1
|
142.1
|
153.0
|
163.9
|
174.9
|
185.8
|
196.7
|
207.7
|
218.6
|
|
3.3
|
139.1
|
150.7
|
162.3
|
173.9
|
185.5
|
197.1
|
208.6
|
220.2
|
231.8
|
|
3.25
|
141.2
|
153.0
|
164.8
|
176.5
|
188.3
|
200.1
|
211.9
|
223.6
|
235.4
|
|
Ratio
|
3.15
|
145.7
|
157.9
|
170.0
|
182.1
|
194.3
|
206.4
|
218.6
|
230.7
|
242.9
|
|
3
|
153.0
|
165.8
|
178.5
|
191.3
|
204.0
|
216.8
|
229.5
|
242.3
|
255.0
|
|
2.92
|
157.2
|
170.3
|
183.4
|
196.5
|
209.6
|
222.7
|
235.8
|
248.9
|
262.0
|
|
2.89
|
158.8
|
172.1
|
185.3
|
198.5
|
211.8
|
225.0
|
238.2
|
251.5
|
264.7
|
|
2.75
|
166.9
|
180.8
|
194.7
|
208.6
|
222.6
|
236.5
|
250.4
|
264.3
|
278.2
|
|
2.6
|
176.5
|
191.3
|
206.0
|
220.7
|
235.4
|
250.1
|
264.8
|
279.5
|
294.2
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
tire=
|
29
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RPM
|
|
|
|
|
|
|
6000
|
6500
|
7000
|
7500
|
8000
|
8500
|
9000
|
9500
|
10000
|
|
3.5
|
135.8
|
147.2
|
158.5
|
169.8
|
181.1
|
192.4
|
203.7
|
215.1
|
226.4
|
|
3.3
|
144.1
|
156.1
|
168.1
|
180.1
|
192.1
|
204.1
|
216.1
|
228.1
|
240.1
|
|
3.25
|
146.3
|
158.5
|
170.7
|
182.8
|
195.0
|
207.2
|
219.4
|
231.6
|
243.8
|
|
Ratio
|
3.15
|
150.9
|
163.5
|
176.1
|
188.7
|
201.2
|
213.8
|
226.4
|
239.0
|
251.5
|
|
3
|
158.5
|
171.7
|
184.9
|
198.1
|
211.3
|
224.5
|
237.7
|
250.9
|
264.1
|
|
2.92
|
162.8
|
176.4
|
189.9
|
203.5
|
217.1
|
230.6
|
244.2
|
257.8
|
271.4
|
|
2.89
|
164.5
|
178.2
|
191.9
|
205.6
|
219.3
|
233.0
|
246.8
|
260.5
|
274.2
|
|
2.75
|
172.9
|
187.3
|
201.7
|
216.1
|
230.5
|
244.9
|
259.3
|
273.7
|
288.1
|
|
2.6
|
182.8
|
198.1
|
213.3
|
228.6
|
243.8
|
259.0
|
274.3
|
289.5
|
304.7
|
Compression Ratio Formula
GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87
X (Head Gasket Thickness in Inches)
DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87
X (Inches Below the Deck)
HV (Head Volume) = CC's
VV (Dish, Valve Pocket, Dome Volume) = CC's
(Minus for dish or valve pockets, Plus for dome)
PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87
Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)
Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854
Convert Cubic Inches to CCs = Cubic Inches X 16.386
Convert Cubic Inches to Liters = Cubic Inches X .016386
|
|
Cubic Inch Chart Measure Bore and Stroke
|
|
|
|
|
|
|
|
|
|
Bore
|
|
|
|
|
|
|
|
|
3.00 0
|
3.04 0
|
3.08 0
|
3.10 0
|
3.12 5
|
3.25 0
|
3.48 0
|
3.50 0
|
3.56 2
|
3.62 5
|
3.75 0
|
3.87 5
|
4.000
|
|
4.00 0
|
302
|
306
|
310
|
312
|
314
|
327
|
350
|
352
|
358
|
364
|
377
|
390
|
402
|
|
Stroke
|
4.03 0
|
306
|
310
|
314
|
316
|
319
|
332
|
355
|
357
|
363
|
370
|
383
|
395
|
408
|
|
4.06 0
|
311
|
315
|
319
|
321
|
324
|
337
|
360
|
362
|
369
|
375
|
388
|
401
|
414
|
|
4.12 5
|
321
|
325
|
329
|
331
|
334
|
348
|
372
|
374
|
381
|
388
|
401
|
414
|
428
|
|
4.15 5
|
325
|
330
|
334
|
336
|
339
|
353
|
377
|
380
|
386
|
393
|
407
|
420
|
434
|
Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / (16386 X 1000)
Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / 16386
Convert CCs to Cubic Inches = CCs / 16.386
Convert Liters to Cubic Inches = Liters / .016386 |
