Heads......

Post by **pfgiz** » Fri May 15, 2009 11:14 pm

While I'm in the mood for asking questions...
Are there any benefits on having a 1098 head on a 948 block....
I recently popped my head gasket and on inspection found a crack in the head. So I put one from a 1098 on it. Should I be looking to change it back or not bother?

Post by **bmcecosse** » Sat May 16, 2009 3:23 pm

The 1098 head - 12G202 - has bigger inlet valves and much better flowing of the inlet passages. However -it has a bigger combustion chamber and so unless you had the head skimmed by ~ 60 thou - your compession ration (and therefore engine efficiency and economey) will be very low indeed. With the skimming - it's probably worth about 4 bhp on the otherwise standard 948 engine.