948 / 1098 cylinder head

Post by **sirrom** » Sat Oct 18, 2008 9:19 am

Is there any difference in a 948 cylinder head to a 1098 cylinder apart from slightly bigger inlet valves?
Can a 1098 head be fitted to a 948 if so is there any benefit?

Post by **Peetee** » Sat Oct 18, 2008 9:50 am

In terms of fittings, no difference whatsoever. You can fit a 1098 cylinder head to a 948 (or a 1275 head if you wish-although some work around the valves is needed). Whenever you interchange heads and blocks you must fit the gasket that matches the part with the bigger bore.

Post by **Onne** » Sat Oct 18, 2008 10:36 am

(the bore is the same for 948/1098)

Post by **bmcecosse** » Sat Oct 18, 2008 11:15 pm

No - the 1098 bore is 65 thou larger than the 948 (which is same as 848). To answer original Q - the 1098 can be used and has better inlet ports and valves - but it has larger combustion chambers and must be skimmed ~ 60 thou if used on a 948 engine in order to bring the compression ratio up.