Secondaries? Pros and cons?

[Hog]

Originally Posted by A26B

I don't know if the OBD2 is the same as the 95 MY 475Hp LT5 that never made it to production, or not. If it is, the answer is no.

I just wanted to add a correction.
This engine should have been referred to as the MY1995 "upgrade" engine. It never made it to production as MY1995 was the last year of ZR-1 to be built, not the OBD2 engine as I did. The 1995MY upgrade engine would have had to qualify for OBD2, just like the LT1's did. Chev. was preparing for OBD2 in for MY94/95 with the introduction of the flashable ECM/PCM's.
To certify the 95MY uprgrade engine would have required a substantial effort, probably including a new ECM to include the missfire detection the OBD2 requires.

The lifters/followers were not rollers, 2 test mule engines were built either with a special Lotus lifter, or using camshafts that were developed FROM the info supplied from the Lotus piece.
The Lotus hydraulically variable device that fit into the space of the OEM lifters and would switch profiles to boost low rpm torque(the lack of was often criticized) and an upper rpm breathing to 475 bhp profile. But again my interpretation of Mr Behans report of the 2 1995MY upgrade engines isnt clear, the engines either used the Lotus variable lifter device as part of the 95MY upgrades, or used cam profiles with conventional LT5 valve actuation equipement, that were derived from testing with the Lotus device installed.