noisy lifter replacement

[johnno010684]

hi guys, i have a noisy lifter one number 1 cylinder, my brother in law is a mechanic and he said we might as well replace the whole set of lifters coz its a pretty big job. i was just wondering if these are ok for my vt v6 https://www.zzperformance.com/grand_...=109&catid=104

[chargedvx6]

Make sure you get the OE850 and not the OE-R. The OE850 is a direct replacement for stock whereas the OE-R will require a longer push rod, approx 0.050" and the set up technique is quite difficult.

[acarmody]

When you purchase them, can you post up or PM me the postage cost? Because I'm looking at buying a set but not if its like $80ish postage, cause then I would just get the CROW set.

[chargedvx6]

The post is $58USD. You can get the comp ones here from Rocket or VPW. Just ask for the Comp pro magnums in a set of 12 instead of 16. They are still $150 more than the Morell/ Crow lifters

[acarmody]

The post is $58USD. You can get the comp ones here from Rocket or VPW. Just ask for the Comp pro magnums in a set of 12 instead of 16. They are still $150 more than the Morell/ Crow lifters

In your opinion which lifters are better, CROW or COMP? I'm pretty sure that both sets are going to work out to be the same price when postage is added, the COMPS from USA that is.

[chargedvx6]

The Crows are much cheaper at $220AUD but I went comps for a reason. The Crows only offer an OEM replacement whereas I was after the OE-Rs ability to be anti pump in the upper rev range. The preload set up on the OE-Rs is much trickier and you will most likely need a different length set of push rods.

[acarmody]

Actually with the exchange rate at the moment I could get those COMPs for about $270 so not a world of difference. But are the COMPs (OEM) better or are the Crows equally good, in your opinion?

[chargedvx6]

For an OEM direct replacement the Crows and Comp OE-850 are much of a muchness but for high revs the OE-R875 is the go IMO. Nothing wrong with a set of stock lifters in good working order but with higher valve lifts they are too much of a variable for me because of their range of pump.

[acarmody]

So if I'm going to be chasing 0.550" lift, should I go the 875s?

[chargedvx6]

It's more to do with spring pressures and revs of the set up that calls for one or the other lifter.

If you plan on raising the shift points in the tune and are running a heavier spring then maybe the OE-R875 are justifiable. Some people note that these are a noisier lifter than the OE-850s but mine are nice n quiet as a re a mate of mines. Preload set up on these has to be spot on and is a headache to get perfect

[acarmody]

105lb conical springs and stock rev limiter, so maybe not really worth it.

What's all the go with preload, I'm going through my Gregory's manual and it doesn't say anything about it. Just about filling wih oil, penzoil stuff,retaining plate, etc.

[chargedvx6]

COMP Cams -Frequently Asked Questions About Lifters

[acarmody]

So the way I'm reading it, what it does is make sure the rocker makes exactly the lift it supposed to make by making sure the pushrod has no movement without being over-tight?? And your doing this by tighening the rocker bolts until the pushrod offers slight resistence to spinning using your fingers? And you do this when the valve is fully closed and the cylinders opposite valve is opening, but not fully opened? Also where is the adjusting nut, on the lifter or are they still talking about the rocker bolt?

I'm wondering if my engine builder adjusted the lifters when I got the engine done, with a completely different head setup and a different camshaft. I notice COMP said one sympton is low manifold vacuum and rough idle, well my idle ain't the best (not crap just slightly uneven) and there is a noise coming from the plenum chamber. Also when I disconnect the fuel pump relay, and try to start the engine it won't actually start, just keep turning over with the starter motor. It used to fire up and then die when it ran out of petrol, but not anymore.

Thanks for all the answers chargedvx6, your a champion.