Are na PCV valves identical to turbo PCV valves? Genuine holden parts have different part numbers! Are the aftermarket valves any good?

ive never noticed a difference.

Huh, they look absolutely identical but then again I have seen 3 n/a calais and they appear to have identical brake boosters to the turbo yet someone is sure the boosters are very different Lets think this through, holden could make more money by having more than one listing even though parts are the same because the psychology is people might favour the turbo and hence pay more - seen that type of thing many times. But the PCV is *just* a one way valve - its dead simple, the fittings "might" be different between n/a and turbo but I havent seen that or remember it My considered opinion is holden are either taking advantage or made a stuff up - such a basic valve should be identical. Some original photos have not been recovered yet.

I can assure you the N/A and Turbo brake boosters are very different. The bracket on the front of the master cylinder faces a different way for each because the booster is bigger. Well it was between my Series 200 N/A and Calais Turbo!

yep the turbo booster is 2-3 inches thicker and double diaphram.

Lots of people convert their N/A cars to turbo and use the stock N/A plenum and nothing is said about changing the pcv so I'd assume their the same.