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Stay with what you have.

> Hey,
> Wait I do have domed pistons (they have a
> small hump on the center) because it makes
> up for the slightly larger camber size of a
> late 73 head. Not much of adome just about 4
> cubic cc but it does raise the compression
> of that early E-88. check out the Texas Z
> site and they have all that head info you
> will see what I mean.

> Dustin
Dustin,

Your stock block/head should be giving you 8.6:1. I have read that domed pistons raise compression about half a point. (Of course, this depends on the spec. of the particular piston) Thus, you shouldn't be too far north of 9:1. Even at 9.5:1 you should be running o.k. on 91 octane. With 93 (available everywhere in my area) you should be fine. According to the Texas Z Club, N42 and N47 heads have a volume of 44.6 (compared with 44.7 in the E88). Thus, these heads are no answer to your problem. I know that this may sound rather simple, and I'm sure you have already tried it, but why not back off the advance of the timing a bit? You really should not have a serious problem with the set up you have.
 
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