Stampede4ever

I'm working on LQ4, and I need to know what the Piston Ring Compressor inside diameter is?

Thanks.

07NBSChevy

iTrader: (1)

That will depend on the Brand and Type of Piston Ring Compressor you are using or going to use.

Metric
English

General

Engine Type
V8

Displacement
6.0L
364 CID

RPO
LQ4

VIN
U

Bore
101.618-101.636 mm
4.0007-4.0014 in


Cylinder Bore Diameter
101.618-101.636 mm
4.0007-4.0017 in

Cylinder Bore Taper - Thrust Side
0.018 mm
0.0007 in

Piston - Piston Diameter - Measured Over Skirt Coating
101.606-101.640 mm
4.0002-4.0016 in

Piston - Piston to Bore Clearance - Production ****************
0.022-0.03 mm - interference
0.0009-0.0012 in - interference
*************************
Piston - Piston to Bore Clearance - Service Limit with Skirt Coating Worn Off ************************************************** *******
0.07 mm
0.0028 in
*******

Stampede4ever

It's a 4.0" Bore, the piston diameter is 3.970" I think. My question is do I use one that is 4" inside diameter or one that is couple of thousandths over the piston diameter?

Thanks.

07NBSChevy

iTrader: (1)

Use one that is slightly smaller than the cylinder bore itself.

KCS

iTrader: (20)

The piston should be more like 3.996-3.999" depending on the manufacturer and material. Usually the piston ring compressors are designated for the bore size and will have a reduced ID to accommodate the piston.

This is the one I've used for 4" bore blocks.

https://m.summitracing.com/parts/sme-904000

64post

iTrader: (5)

One piece fixed diameter or one piece split adjustable, about $40 from Summit or Speedway, very easy to use. For the OP, 4.00 fixed or 4.00-4.070 split

cookseyb

ARP, tell them what you got and they will provide the correct size 62 bucks but they are the best.

jayyk31

iTrader: (2)

I used the 1 piece ARP ring compressor for my 4.030 bore LQ4. They have them for the 4" bore as well.

LS1MCSS

iTrader: (18)

Summit

Stampede4ever

Is it tapered the whole length?

Thanks.

BlwnLs1GTO

iTrader: (12)

I believe the taper stops a little ways towards the bottom. But that will allow your piston to slide right into the cylinder with ease. I use the same product above.
I always make sure the machine shop tapers the top of each cylinder to help with this too.
Just buy it...

cookseyb

If everything is "Right" you can push the piston and rings with your thumbs no need for a hammer...