Hi all
I'm in the process of rebuilding my engine and I've just acquired some sti v5 6 heads but my concern is I have the original sti heads gc8 style version 1 wrx sti and they both run different spark plugs what would my best option be as I'm looking to get big bhp out of them do I go with the standard gc8 spark plugs or the newage ones I'm upgrading the coils to new age ones with the conversion that's been spoken about on here any help greatly appreciated also is there any problems or mods that need doing to fit them to the closed deck block

 

If you are fitting version 5/6 heads to a version 1 your inlet manifold won't fit I'm afraid..

Not without buying adaptor brackets and having your inlet cut and extended.

Alyn at AS performance can sort it out for you though as I've just had a similar thing done myself.

Steve