Vetal

iTrader: (3)

Here while my engine is out of the car, I can't make up my mind whether I should change the rings and rehone it, or will it be better left alone as it is.
Compression is 150 psi on +/-3 on all cylinders (9.2:1 CR), very even I would say.
Should I rering the block, or should I better not touch it?

Old Geezer

iTrader: (3)

My $.02: If it's not broke, don't try to fix it.

SShep71

iTrader: (5)

How many miles? You can run a light hone just to restore the cross hatch or take a ball hone to the cylinders. Wash it really good and put new rings in there. Anytime the engine comes out and it has decent miles on it, it is an excellent time to do inspections and do some maintenance. It can reveal stuff you didnt notice and save you headaches later.

garygnu

agreed ^^^ ,thats good pressure .you would have to remove the rods and crank .the ls1 has cracked rod caps .I believe you have to resize the big rod end if removed .

2000PewterT/A

Leave it alone and don't look back.

Vetal

iTrader: (3)

yeah I agree with "don't fix it if it ain't broken", and compression is good for low CR engine...
95% that crank will be out to replace main bearings (I will visually check them tomorrow hopefully), so no problem here. I just don't want to mess with it and risk making it worse... For example I doubt our local shops will care to install deck plate before rehoning
edit: after thinking a bit I guess deck plate is not needed for honing?

Vetal

iTrader: (3)

I've visually checked all cylinders, and number 3 and 4 have vertical grooves that I can slightly feel with my finger (inner side, closer to center).
I guess there is no point in honing then? Either assemble as it is, or bore larger, with new pistons/rings?

Vetal

iTrader: (3)

Does anyone have explanation, why only 2 (opposite) cylinders suffered?

Vetal

iTrader: (3)

Can you tell anything from these pics? How bad are they?

Burken01

iTrader: (88)

Can you catch the grooves with a finger nail?

I went through this on my last engine, and you'll get conflicting info from people by just showing pics and not seeing it in person..

It's catch 22, you can run it now and get away with it for awhile.. But like I was told, if there are deep grooves they only get worse with time..

What's your engine guy say? Is he leaving the Decision up to you?

Vetal

iTrader: (3)

Yeah unfortunately I can feel them with my fingernail (I'm not sure what exactly is "catches"). Builder also says that if I can feel them, they won't go away from honing

Burken01

iTrader: (88)

Some scratches are normal but if you try to hook your nail in them they won't catch because they are superficial and not deep enough..

When your nail can hook into it and stop when your sliding your nail over it, that's when the scratch can get serious because material has been removed from the cylinder walls and gets trapped in between piston rings among other places..

Vetal

iTrader: (3)

What's the best solution, replace 2 sleeves and rehone / rering all 8?

Looking at things away from "scratches" and stuff...
Before I opened it up, I was perfectly happy with my cylinders, nice even compression, some oil consumption but not too much.
So I guess problem is more in my mind now ) I guess I will not try to "fix" it this time. Good idea or not?

87gnx

iTrader: (3)

As said above, if your finger nail can "feel" the scratch, thats about .010 or more. Just hone all of the cylinders, re-ring and be done.That way you'll have the piece of mind, and it should be good to go for a long time.$.002.

wildcamaro

iTrader: (15)

Just curious but how many miles are on the engine since it's been made into a 383?

Vetal

iTrader: (3)

Hard to remember now... In 6 years I put only maybe 10K? Don't know how much previous owner did in a year or 1.5 (my bearings are dated 05')

Vetal

iTrader: (3)

OK, I've put 17K, and previous owner sold me the car as having 14K on the motor