Grafton's 07 STi

[Yamazaki]

With the overbore, what will your new displacement be?

[Grafton]

With the overbore, what will your new displacement be?

2.5L still,
old bore was 99.5mm x 79mm stroke x 4 cylinders = 2458cc
new bore 99.75 x 79mm stroke x 4 cylinders = 2470cc
12cc displacement bump or .012 L

I got heads today!, the valves were reground due to pitting, and the heads resurfaced by .003"





While waiting on the copper gasket spray to dry I added some Piston Wisdom™

Jeremy Clarkson inspired



Copper coated head gasket in place:


Heads installed:




Cams installed to check clearances




Thanks to the re-grind only one valve was in spec, going to mic the shims Thursday and find out how many I have to order and if I can just swap some around.