What's best head to modify


I'm new to the world of micras

Currently have a micra rally car with cg13de engine which is around 125 at the flywheel

But also have a cga3 engine which I am currently building

I was wondering if the cga3 head as standard is simaliar to the cg13 head ? Ie port size , valve size etc

If there are differences would anyone tell me what they are please thanks


Club Member
just the hole for the dizzy is the only difference really steve, some corsa pistons with aftermarket rods in the CGA3 would make good power :)