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[tunnie]

Are they the same? My understanding is apart from very early V6's they are all the same post 1998?

[RobG]

Lifters are the same across all V6 Ecotec but they changed around 97/98 when a different oil pump which required modified T vents was fitted. Their construction also differed slighty to increase reliability

[tunnie]

Cheers Rob 

[Marks DTM Calib]

Basicaly as above.

As of model year 97.5 (from memory) an anti bleed down lifter was used, this in turn was combined with a modified oil pump and a different T vent which controls the oil feed to the head oil ways.

From that point on, no change.

They are made for VX by INA and are common across quite a few manufacturers (including BMW).

Here is the manufacturers webpage:

INA Hydraulic Tappets

The original ones were the standard design and the later ones the anti drain design

[tunnie]

Thanks Mark, interesting read that. I have a few in the garage and see on the anti drain have the springs, which i remember pumping clear to get old oil out 

Reason I ask is I think my 3.2 will need a new set of lifters, still tappety when hot. (still fine when cold) but a couple of more hearing tests by myself and TB now think its no oil pressure related as if you increase rpm to say 950/1100/1500 ect its still there, but masked by engine noise/sound proofing.

Still to to get this gauge sorted to test pressure though