Horrible01

I know some one out there can point this out for me, I have a set of old school trw pistons here and i can figure out where the marking is to point to the front of the block. here are 2 links that might help anyone who knows the answer to figure this out for me. thanks for you help guys.

Viprklr

iTrader: (5)

The dots, indent, or arrow. In your case the dome goes highest.
Try to visualize the slug in the cylinder and how the valves come down.

InfernalVortex

iTrader: (4)

I think for some pistons it doesn't matter. But I'd make sure the thing is symmetrical all the way around first. I just remember reading in my books that if it had no markings then it could be installed either way. But I'd make sure first! Just make sure you dont put them in 180 degrees out (or upside down if you prefer to think of it that way).

Damon

Since they're already pressed on the rods you need to watch the orientation of 2 things at the same time: piston orientation and rod orientation.

1. Piston orientation- the valve relief trench always goes towards the lifter valley (or the dome always goes towards the outside of the engine, if you prefer).

2. Look at the bearing notches in the rod's big end. They ALWAYS point towards the outside of the engine, regardless of which bank of cylinders they are installed in.

You must make sure that BOTH of these orientations are correct for each hole. This means that 4 of the piston/rod assemblies will only orient correctly for the driver's bank of cylinders and 4 will only orient correctly for the pass. side bank of cylinders.

Horrible01

ok that sounds good, ill post some more pics later on today just to make sure i did it right. Also if anyone is interested, I can document everthing i do from here on it, More or less to show other and also to make sure im doing everything right. ( first engin build on my own )

ross

Damon has it also look at the rods thay will have extra clearance for the crank jounels close to the counter weights.

jamon8

iTrader: (3)

use some clay

Horrible01

just wondering what would i do with the clay. I know i read something about smearing it over the top of the piston but i forgot why. I think im going to follow through with what InfernalVortex and Ross said Sorry Viprklr. Ill follow up tonight . Thanks