Re: An enigma insues...
 

Yes,and that is on the lowest point/base circle of the cam lobe.

Lee it was all Greek to me but thank god i'm Greek and i understood it :-)

This is why we need a tech session with a motor/heads all apart it's easier to understand it when you see it.

Pete
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Re: An enigma insues...
 

Re: An enigma insues...
 

Pete proposed a public autopsy of my 90 motor at his place, if there is interest and I can get someone to haul the body over, I would be fine with a tear down at petes.

Re: An enigma insues...
 

When Pete told me about this, I pulled out the GVD heads I have to check. Basically the top of the 2 lifters on either side of the cam bearing surface and the bearing surface should be nearly one continuous plane. Should be able to slide fingernail from
lifter to bearing and then back onto next lifter with hardly a hangup.

Re: An enigma insues...
 

If you recall I picked up a motor cheap from 8upZR1 who pulled the LT-5 after the car would not run properly. I am guessing the afore mentioned issue was his problem.....along with cutting the intake gasket surface too thin.

We will know in the next month or so if this was the issue.

Re: An enigma insues...
 

Couple of things that need mentioning here. 1. You can use 90-92 lifters in all years without modifications HOWEVER you cannot use 93-95 lifters in 90-92 without cutting the valve stem slightly. The later lifters are taller than the earlier lifters. So if you do a valve job on an early engine and replace the lifters with the later design you have just created a nightmare for yourself. 2. When you do the leakdown test time will effect the compression and leakdown. JL long ago told me a leakdown test on a LT-5 is a crapshoot because you can get one set of figures with an engine with lifters that have bled down and another set for one with pumped up lifters so they never depended on leakdown info on LT-5s.

Tyler

Re: An enigma insues...
 

Tyler, i don't think there is a differance in the lifters.
There is a differance in valve lengths.
http://www.zr1netregistry.com/ZR1_specs.htm#9

Yes,your are right about leak down this is why i say she is a finicky girl there is alot of things one needs to know/check.
Once you crank her a bunch or run her for a few minutes lifters will bleed down.

What stinks is if one screws up it can cost some real $$$$ which will make taking it to a tuner in the first place a bargain.


Pete

Re: An enigma insues...
 

Hey PETE

Did ya ever know about that Gyro Stand on Ashland?

Have you ever been by it?

I did a "Pete the Greek" google and found it -- right here in Chicago of all things.

Guess it just proves that Chi-Town has at least one of everything.

You should get a photo of you and da Z in front of it someday.

That would be KOOL.

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A giant picture of pressed lamb on Pete the Greek's sign lets you know where the joint's specialty lies. The gyros here win the award for succulence, teeming with onions, tomatoes and cucumber sauce, the meat cooked to perfection. Pete also makes a mean cheeseburger, complete with home-cut fries. The hot dogs do a Chicagoan proud, with a perfectly steamed bun, all the trimmings and no ketchup to be found near the dog. Breakfast at this Greek-owned spot (like you didn't know that) includes the staples: sausage, eggs, breakfast sandwiches and omelets served fast with loads of hot coffee. None of these options exceed $10.

This newer brick-and-glass storefront, located next to a gas station, provides ample seating for folks who want to have a seat and savor their breakfast or lunch, with counter seating surrounding the main dining room?perfect for gazing out onto the street while eating.

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This place has the best gyro. We learned about it from working nearby and we come whenever we get the gyros craving. I don't care much for fast food or gyros, but this place makes it worth it. The owners have friendly service and are attentive to customers' needs.

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312-243-6199 >> I called there and they still go by the same name. However Pete sold to the present owner many years ago so no Pete anymore.

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BTW Paul congrats on getting the Z going again -- sorry about all the "Pete stuff" not trying to hijack your thread here. LOL -- Glad to see the symphony of the LT-5 is rumbling once again south of the I-80 line.:cheers:

Re: An enigma insues...
 

Pete, I see the valve lengths vary from 90-92 vs. 93-95. And, from that same link source, there is no difference in lifters across all years, if I'm reading it right. SO.....Where is the difference in the lengths being made up? Is there a difference in the base radius of the cam lobes, or seat depth in the heads, or does the lifter just suck it up?:icon_scra

P.

Re: An enigma insues...
 

Hence the difference in the lifters. Info courtesy of Geoff Jeal.

Tyler