ZZ383 help

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Sep 16, 2006 | 07:05 PM

#21

edcmat-l1

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From: Chesapeake Va

Quote:

Originally Posted by 500HPC4

here is a link to the GM ZZ383 specs.

The question I asked is for clearance specs...if you dont have them then keep your trap shut and SCREW up some one elses post.

From here on out I am only repling to clearance and ZZ383 tech in this thread.

Chris

Refer:Post #9
Question in principal. Does the combination make sense?

Sep 17, 2006 | 06:29 PM

#22

500HPC4

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From: Colorado Springs Colorado

before you start spouting info like your ring end gap figures you may want to look them up as they will vary with intended use of the engine and pistons used. Your info would lead to butting of the top ring and your "fuse" piston ideas. The link from KB will show a .0080" factor.

quote from #9
"I know for fact the ring end gap for the top ring is .055 per inch of bore."

http://www.kb-silvolite.com/download...tech%20tips%22

Sep 17, 2006 | 06:48 PM

#23

CFI-EFI

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Joined: Sep 2000

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From: The Top of Utah

Unless you know for a fact that they are, I wouldn't expect a ZZ383 to be equipped with KB aftermarket pistons. Not all hyperteutectic pistons are created equal. The KBs have some rather unique clearance specifications. Proceed with caution.

RACE ON!!!

Sep 17, 2006 | 08:15 PM

#24

500HPC4

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From: Colorado Springs Colorado

They are actually made by Speed Pro but I cant find any links to their specs. I have them here in their product manual and the chart is exactly the same as the KB chart. It looks as if they copied the chart from KB.

Sep 18, 2006 | 08:37 AM

#25

edcmat-l1

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From: Chesapeake Va

Quote:

Originally Posted by 500HPC4

That is correct. I never said I would tighten up the first gap, just the second. If you read any further you would have seen their warning about superheating the top of the piston. And the fact that they have been known to but gaps as wide as .060 So if your trying to be a smart a** and correct someone you would think that you would have read all of the info and at that point known regardless where you set the gap at you're doomed. You gonna gap them at .060 to make it dont go boom? So you see my point of it not making sense. I assume you being on a budget means you can only afford to do it once? They have a warning about timing, did you read that? That right there should scare you off.

Sep 18, 2006 | 11:42 AM

#26

500HPC4

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From: Colorado Springs Colorado

No matter what I say you WILL BE RIGHT. So I guess that s it.

Sep 18, 2006 | 11:56 AM

#27

edcmat-l1

Melting Slicks

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From: Chesapeake Va

Quote:

Originally Posted by 500HPC4

No matter what I say you WILL BE RIGHT. So I guess that s it.

Im not trying to be right. Im trying to convey to you the fact that hypereutectics for YOUR application doesnt make sense. The cost difference of hypers to forged are insignifigant to the cost of doing it twice. And no matter what the tune, or top ring gap, or anything else, those pistons in a TT application is looking for trouble. I am not a hobbyist speaking from a limited amount of exp with 1 engine. I have decades of exp, built many, many engines. Including ALOT of 383 and 396 strokers. Just trying to steer you in the right direction. Sorry if it comes across a bit brash.

Sep 29, 2006 | 01:03 AM

#28

sperkins

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Joined: Oct 2005

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From: Macon, GA

Quote:

Originally Posted by 500HPC4

It turns out that the problem with this zz383(early builds like this one) was that they use a standard 350 block bored to accept cast or forged pistons.

Are you saying that GM has fixed this problem?