48 gram lifters!

[Will'sFiero]

Since this is a lifter thread, I can probably ask these questions here...

If you don't mind, what was the original app for these lifters (they can't possibly be custom for that price?)?
What's the lifter bore on the OBDI engines?
What's the "setup height" of the lifter (distance from tip of valve stem to cam base circle?

What's the lifter bore for the OBDII engines? I @$$ume other relevant dimensions, like the setup height, are the same?

I'm looking for things I can do to my Northstar. I already have uprated valve springs, which supposedly make the stock lifters good for 8500+, but I'm all about reducing valvetrain mass anyway...

[SappySE107]

your northstar uses 33mm lifters. I haven't tested any lifters for that size but I know the new 2.4 uses them. Same for the 96-97 3.4 DOHC lifters. I dunno if they all swap across but these won't work for you. I went through a lot of lifters and a lot of part numbers to find these specific lifters so I am sure the same can be done for the 33mm lifters.

They are 35mm diameter.

[Synestral]

29g * 24 lifters is over a pound of valve train weight just gone. Now if only there were some stiffer aftermarket springs that I could use with a turbo and a few pounds of boost (haven't decided how much yet, but don't wanna go insane) and those lightened valves I read about in another thread I'd be all set for a 7500 engine.

[Will'sFiero]

your northstar uses 33mm lifters. I haven't tested any lifters for that size but I know the new 2.4 uses them. Same for the 96-97 3.4 DOHC lifters. I dunno if they all swap across but these won't work for you. I went through a lot of lifters and a lot of part numbers to find these specific lifters so I am sure the same can be done for the 33mm lifters.

They are 35mm diameter.

I know the Northstar uses 33mm lifters. I'm just collecting information.

What's the setup height for the TDC lifters?

[SappySE107]

Ill have to measure the lifter when I go back to the shop. I have found stiffer springs but I need to get a set of seats to match them before I can try them out. Im still looking for other springs though that will fit right in.

[Will'sFiero]

Ill have to measure the lifter when I go back to the shop. I have found stiffer springs but I need to get a set of seats to match them before I can try them out. Im still looking for other springs though that will fit right in.

Thanks. I wouldn't have thought it would be that simple, though. Isn't there a spring inside the lifter that gets compressed when you bolt the cam carrier down? That would skew the measurement...

That's why I was hoping you had it already... it's pretty hard to get from assembled valvetrain components. How did you select lifters without taking that measurement?

[SappySE107]

I didn't measure it in units, rather just a direct comparison between lifters. The lifters I sell are a perfect match for the hydraulic button height to the the face of the lifter that the lobe contacts. Any preload will then be the same for both lifters. The oiling ring/hole are also very close so that isn't an issue either. The only real difference aside from weight is the overall height of the lifter. The stockers have a taller side skirt.

[Will'sFiero]

Ok. Cool.

Kawasaki KZ1000 solid lifters fit the same size bore as the Northstar lifters, but have a different setup height, obviously. I'm gathering as much info as I can from other GM OHC valvetrains to see what might be possible for valvetrain geometry changes.

[SappySE107]

The amount of work needed to fit solid lifters properly is pretty much out of the question for most DOHC owners. I have a source for solid lifters for the 91-95 motors but you need to cut up a cam carrier to check for valve lash adjustments and then bolt on the real carriers after you test fit every one.

[OldSkoolGP]

I have been running the lifters for a week now. They were noisy for about the first 15 miutes, but once they got pumped up not a drop of noise, even after a couple 7 grand runs. Quietest lifters I've ever heard. We'll see how they're holding up after this weekend, cuz they're gonna worked this weekend. So far, my opinion is they're a worthwhile investment.

[34T]

these are the 48g ones?
great; I didn't know anyone was actually running them; good to know. I take it you are going to the strip this wknd? I am sure everhone will want to hear before and afters! Anything else different at the same time or just lifters? And do you have a previous timeslip to compare.... (hey, just in case....)
gp
Ben; re: solid lifters; I guess they sound like a lot of work and even if I did want to cut up another cam carrier it would depend on all the carriers being EXACTly identical which might not be a good assumption.....