Covers and Coolers
The B series engine could experience high oil pressure spikes on cold start up (up to 130 PSI), especially in low ambient temperatures. The original design would take oil bypassed by the oil pressure regulator and route it to the oil pump inlet (dump to pump). To correct this, use an oil cooler, oil cooler cover and oil cooler gasket that takes the oil bypassed by the regulator and routes it into the oil pan (dump to sump).
Oil coolers and gaskets can give you fits if used in the wrong combination, with either extremely high or low oil pressure, when used in the incorrect combinations.
Cooler #1 is used as follows: Coolers with four-passage drillings have drillings at both the dump-to-sump and dump-to-pump locations. These are not to be used on the ISB (STORM) blocks and are no longer produced for production or service.
Cooler #2 is used as follows: Coolers with three-passage drillings designed for dump-to-sump lubricating systems can be used in a STORM or pre-STORM block if the engine uses a dump-to-sump oil system.
Cooler #3 is used as follows: Coolers with 3-passage drillings designed for dump-to-pump lubricating systems can only be used on STORM or pre-STORM blocks with a dump-to-pump oil system.
Gasket #1 is for a STORM Block and can be easily identified by the “window” and slot in it.
Gasket #2 is for a Pre-STORM Block. The cylinder block, oil cooler, oil cooler gasket and oil cooler cover must be matched up correctly. If not done correctly, high oil pressure or low oil pressure will be experienced.