Crankshaft Decode

Chevrolet crankshafts have a casting number located on the rough surface of one of the counterweights or between the bearing journals. Standard performance used cast (nodular iron) cranks, while high performance engines used forged steel cranks.

Casting number	Year	Engine	Construction	Main journal	Rod journal	Stroke	Notes
1130	1968-69	327	forged	2.45	2.10	3.25
1182	1967	350	forged	2.45	2.10	3.48	SS350
7115	1965-69	427	forged	1-4: 2.7495 5: 2.7488	2.20	3.76
3804816	1965-69	396	unknown	1-4: 2.7495 5: 2.7488	2.20	3.76
3814671	1968	327	forged	2.45	2.10	3.25	hi perf, HD truck
3815822	1967	302	forged	2.30	2.00	3.00	Tuffrided, special flange, Z/28
3856223	1965-69	396	forged	1-4: 2.7495 5: 2.7488	2.20	3.76	1965-66 all 1967-69 hi perf
3863144			unknown
3874874			unknown
3884577	1966-67	327	forged	2.30	2.20	3.25
3892690	1967	350	forged	2.45	2.10	3.48	Camaro only replacement
3904815	1965-69	396	cast	1-4: 2.7495 5: 2.7488	2.20	3.76
3911001	1968-73	307/327	cast	2.45	2.10	3.25	replacement
3911011	1968-69	307/327	cast	2.45	2.10	3.25	replacement
3923279	1968	302	forged	2.45	2.10	3.00	Z/28 only
3932442	1969-85	350	cast	2.45	2.10	3.48	replacement
3941178	1969	302	forged	2.45	2.10	3.00	Z/28
3941182	1968-76	350	forged	2.45	2.10	3.48	replacement
3941188	1969-71	350 forged	2.45	2.10	3.48	hi perf/truck/ replacement

These are cranks that would have been used in Camaros as either standard or replacement during the period. There were other cranks used in Chevrolet engines which may have ended up in your motor if it's not original. If you do have a crank with a number not listed here, you can find it in "Chevrolet By The Numbers" by Alan Colvin. Find out where to get it on the books page.