DOHC lifters

[sd_iconoclast]

Where can I get the best proice on DOHC lifters? Are rebuilt lifters OK? One machine shop I talked to says they just use the old lifters and they have no problems. Another machine shop says that I should absolutely get new lifters. Where can I even get rebuilt lifters?
Some catalogs list the DOHC lifters as being the same as the Quad 4 lifters. Others say they are not. Which is it?
What have you guys experienced?

[BowtieKid79]

The quad 4 and the 3.4 have CLOSE to the same lifters, but they are not identical. They will interchange, but I don?t know the long term effects of the q4 lifters in the 3.4. I have not had any problems with them yet, but it has only been a year. You should be fine using your current lifters as long as they are not scratched up or cracked. The cam lobes have so much contact area that there is virtually no wear on the lifters. I have never heard of rebuilt lifters. I would check your current lifters out and go from there.

[sd_iconoclast]

The quad 4 and the 3.4 have CLOSE to the same lifters, but they are not identical. They will interchange, but I don?t know the long term effects of the q4 lifters in the 3.4. I have not had any problems with them yet, but it has only been a year.

Am I to understand that you have Quad 4 lifters installed in your 3.4?
What is the difference between the two lifters?

[SappySE107]

http://www.60degreev6.com/index.php?p=pages&pid=145

[BowtieKid79]

Yes, i have Q4 lifters in my 3.4. the only difference worth mentioning is the skirt length.

[5speedz34]

So, would there be any difference, or gain over Q4 lifters? Since it is shorter would the valve not open as much?

[SappySE107]

the side skirts are shorts...has nothing to do with valve lift. They might weigh slightly less which would be good.

[grandprix34]

hey ben, when replacing the camshaft, do i need new lifters? The book says to replace the unit as a set cuz old valve lifters will destroy a new cam in less time that it takes to put it all back together...

[SappySE107]

Eh, im using used lifters from different engines in my cutty right now. The deal with lifters and cam lobes is the wear pattern. With pushrods, there is an enormous amount of pressure on a small contact patch, which means the wear pattern must remain the same or it will wear out the lobe extremely fast.

Our lifters have a wide contact path, and the backside of the lobes are notched to spin the lifter. This means less pressure on the lifter. Pushrods depends on the eliptical shape of the lobe surface to spin the lobe...which is the wear pattern. I don't believe we have that problem, and my lifters certainly aren't worn down to being destroyed yet. I dont drive a whole lot either, but I have about 2000 miles on the lifters being half original, all mismatched, and no original wear patterns being where they belong.

So, i recommend new lifters if they are old. If you reuse them, polish them up. I think they will be ok.

[grandprix34]

THANK YOU! now i dont have to drop major $$, im using the same ones