john 67

I have a 2001 6.0 iron block from a pickup complete takeout,I did a search and it seems the only way to tell is to look into the cylinder to see what type piston it is .Is there any other way to tell ? I will be installing this into my 66 biscayne .Also any input to add 100 hp would be helpfull .JOHN

1_bad94Camaro

iTrader: (15)

you can also tell by the 8th diget of the vin. I cant remember which letter means which motor. the pistons is the easiest way to check.

69LT1Bird

iTrader: (1)

8th digit of VIN.

LQ4 = U

LQ9 = N

-TheBandit-

iTrader: (1)

How about running a compression check? The LQ9 should generate higher psi than an LQ4 based on the increased CR.

Bullitt4110

iTrader: (31)

I was able to look through the spark plug hole on mine with a flash light and seen the dish in the piston to determine that it is a LQ4.

GMCtrk

iTrader: (23)

LQ4. LQ9 production didn't begin until 2002 model year.

john 67

Thanks for the info, I cant find the vin , there is a vortec cover on the motor,

Old Geezer

iTrader: (3)

the dr side, rear of the block... Should be marked w/ a laser etching.