QG18 head on QG15 block

Bubba · Posted: Wed Nov 04, 2009 9:08 pm Post subject: QG18 head on QG15 block

Is it possible to install a QG18 head on a QG15 block? How much rewiring needs to be done and what are the expected hp gains? Seriously thinking bout this mod but haven't heard of or seen it done b4.

QG · Posted: Thu Nov 05, 2009 9:49 am Post subject:

I think this was dicussed in a previous thread, but with a QG16 head on a QG15 block (I THINK).

Try going through the pages or research it.

If you wanna try that mod, you will need the QG18 ecu and harness, and you need to stick with the same QG series....there is a series 1 QG (cable) and series 2 QG (E-throttle).
I cannot estimate the HP gains, maybe one of you mech can share some light on this?!?! Whether if he will suffer compression lost or gains.

I know a smaller head on a larger block does increase compression...eg. a SR18 head on a SR20 block will increase compression...I never heard anything on a Larger head on a smaller block though Confused