I measured mine and it is .025. There are so many conflicting posts that I have found that state it should be btn .004 and .012 and also that GM original spec variation was btn .012 and.09. I have a Petronix II in it and has been running great for the past 12 yrs.
Given that I am replacing the...
Ordered a new ZZ383 from a dealership and got a great deal. Decided last yr that I was going to crate my original engine as it was needing a rebuild anyway. I just checked the pdf and it said to order the 14088650 flywheel but thinking of going with the lighter weight 14088646. I no longer plan...
Other than sealed bolts, valve covers and oil pan seems the CT is just a ZZ4. I broke a valve spring on my original Lt-1/Zr-1 engine that we (MountainMotor, Curtis) and I built in '02. It lasted 30k and lots of 1/4 passes but is also .40 over with 1 sleeved cyl. Car had been raced in the '70s...