Simple question - which port is inlet on LS1 water pump

[Gunnytron]

Believe it or not I can't find this information out. I looked on pirate4x4 but their pics contradict each other.

So which of the 2 ports on the LS1 water pump is the inlet (from heater) and which is the outlet (to heater)?

Ta

[largeorangefont]

Bigger port toward front of engine is flow to the heater. Small is return.

[Gunnytron]

Nice, thanks.

[radiomike]

Did you use the existing rhd heater hard pipe, if so the hose at the heater end is almost perfect for water pump to hard pipe? 

[Cobranut]

Does it make any difference which direction the coolant flows through the heater core?

I think I routed my outlet to the outboard port at the firewall, just because the hose routing is cleaner.
My heater output isn't much in winter.  I had attributed it to the 170 degree t-stat not letting the motor get fully warmed up.

[largeorangefont]

Should not make a difference the car should burp out any air bubbles.

[Gunnytron]

Did you use the existing rhd heater hard pipe, if so the hose at the heater end is almost perfect for water pump to hard pipe?

No I didn't. Pretty sure there wasn't room for it unfortunately. I have got the hoses r nningbtoeard the front if the car then through the bumper support and then back along the frame rail to the heater.

[gc3]

Should not make a difference the car should burp out any air bubbles.

flowing bottom up makes the heat work better when there are bubbles though.

[Cobranut]

I agree, but the tubes through the firewall are side by side.  Which one goes to the bottom?