baggins

iTrader: (21)

ok so i have an lq4 shortblock and i have a like new set of lq9 rods and pistons. im going to go through the bottom end and while im at it i would like to replace the lq4 stuff with the lq9 parts. will i need to do any re balancing or will this stuff just work as is?

also what is a good but not overkill set of rings and bearings for this setup, it will see boost?

baggins

iTrader: (21)

just to clarify i realize theyre both 4.000 bores but am more worried about having to rebalance because ill be using the lq4 crank and then the lq9 rods and pistons? shoot maybe the cranks are the same, i dont know though. thanks in advance-Nick

mark21742

Any time you change out any part in rotating assembly need to get it balanced...a tenth of a gram here and there at 5-6,000 rpm can give a lot of internal vibration end early wear/ break down

baggins

iTrader: (21)

Are the cranks the same?

mark21742

Yes, but you can have variations from the same mold....an air pocket here or a heavy spot there....know what I mean? You'll only know how close or far out it is if you balance the assembly

PREDATOR-Z

You mentioned it will see boost. IMO keep the LQ4 stuff.

Prorac1

iTrader: (4)

Agreed, keep the LQ4 dished pistons. Eric L

baggins

iTrader: (21)

On e85

smws6ta

iTrader: (5)

This thread is similar to my questions.


I have a LQ4 short block. I've recently acquired LS2 pistons. Besides getting the crank balanced anything else?


Future plans are LS3 heads and intake with either a custom grind cam but open to something else. Any suggestions would be great.

usmcpi

iTrader: (2)

You could prolly pick up some 317 heads cheaper and have them ported. With the bigger CC of the 317s over the l92/ls3 heads + dished lq4 pistons it would be the best optimal budget boost build.

I think you are all over the place here...you need to set goals for the car and aquire parts for that goal...not just get a ton of random parts.

1nasty86

iTrader: (63)

I got a set of 317 heads if you decide to go that route

smws6ta

iTrader: (5)

Not going the boost route, maybe in a yr or 2. For now looking to get in the mid to high 400's via NA.