When did Pontiac start using cast crankshafts?
: Pontiac used a forged crankshaft in its early V-8s. Castings first appeared in 1959 and were used through the end of V-8 production in 1981. Cast Pontiac cranks are quite durable and can offer excellent reliability to 600 hp or more with typical preparation.
What causes no crank / no communication on Pontiac G6?
The following diagnosis might be helpful if the vehicle exhibits the symptom (s) described in this PI. A condition has been identified that could cause a NO crank/No communication on the LE5-4 cyl engine. This condition has been identified as a loose ground G105 behind the A/C compressor.
When did the 3 inch crankshaft come out for the Pontiac V-8?
The 3-inch unit was used in all V-8s up to 400 inches produced between 1959 and 1979. The 3.25-inch unit was introduced in the early 1960s for the 421, and is found in all other Pontiac engines displacing up to 455 ci.
What are the parts numbers on a Pontiac crankshaft?
Casting numbers can be used to identify most Pontiac crankshafts. Location varies, and I have found original Pontiac cranks without part numbers, some partially or fully stamped, and others with full numbers.
: Pontiac used a forged crankshaft in its early V-8s. Castings first appeared in 1959 and were used through the end of V-8 production in 1981. Cast Pontiac cranks are quite durable and can offer excellent reliability to 600 hp or more with typical preparation.
What are the dimensions of a Pontiac crankshaft?
Depending upon the manufacturer, bearings are available in standard dimensions, .001- inch undersize and then in .010-inch increments. Present undersize is up to .030 inch for main journals and .040 inch for Pontiac- and Chevy-size rod journals. You may need to check with the manufacturer for current availability.
When did Pontiac start using nodular iron for cranks?
Pontiac used the alloy during the late 1960s and through the mid 1970s; such cranks have a large “N” cast into them. Some nodular cranks of the era lack the identifier and that can cause confusion. Pontiac records indicate that the cranks were still constructed of nodular iron, however.
What causes a crack in a Pontiac crankshaft?
A crankshaft constantly flexes during normal operation. Over time, cracks can develop in the fillet area (where the journals meet the counterweights). If your build includes a cast Pontiac crankshaft, it must be magnetically inspected (Magnafluxed) to determine that it’s completely crack free before spending any money on machining.
Pontiac used the alloy during the late 1960s and through the mid 1970s; such cranks have a large “N” cast into them. Some nodular cranks of the era lack the identifier and that can cause confusion. Pontiac records indicate that the cranks were still constructed of nodular iron, however.
What kind of iron does a Pontiac crankshaft use?
If considering an original Pontiac crankshaft, I suggest any Armasteel or nodular iron casting produced from 1964 to about 1974, so long as it contains the appropriate stroke and journal dimensions for your application. These castings generally weigh between 60 to 70 pounds and are adequate up to 600 hp.