Low oil pressure in ZL-1

**69SSZL1** · #1 03-13-2009, 01:34 AM

Yes, wrong or loose cam bearings could do it. My machinist said the ZL-1 cam bearings were not standard BBC, he put in Dart Block bearings-Durabond HP cam bearings GMP-12. Just throwing things out there.

**Alss** · #2 03-13-2009, 01:40 AM

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Yes, wrong or loose cam bearings could do it. My machinist said the ZL-1 cam bearings were not standard BBC, he put in Dart Block bearings-Durabond HP cam bearings GMP-12. Just throwing things out there.

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aware of the different cam bearings for this block..did buy the right one..but..we are going to re-check everything now..gonna pull some caps and make sure all is well

**RPO LS7** · #3 08-07-2019, 02:02 AM

Quote:

Originally Posted by 69SSZL1

Yes, wrong or loose cam bearings could do it. My machinist said the ZL-1 cam bearings were not standard BBC, he put in Dart Block bearings-Durabond HP cam bearings GMP-12.

Sorry to dredge up an old thread, but doing some research on this topic and was hoping someone experienced could expand on what the difference is regarding the cam bearings for the new release two piece rear main seal aluminum ZL1 block, and any regular production Mark IV big block. Thanks.

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