California Dauntless

The other day when we were talking about distributors, Patrick pointed out that the CA 225s had a lower compression ratio (8.5:1) than the non-CA 225s (9.0:1). How was this achieved?

 

I would guess different pistons. That would be the least expensive way to do it, from an OEM POV.

 

yep
that's how it was done

edit: actually my 225 was a CA 225 that was 9:1 before I rebuilt it.

 

I was hoping for just a thicker head gasket. So are they flat and domed or something else? If I change to the higher compression piston can I use the old rods and wrist pins.

 

I think the 9:1 were domed
the busted one here on my desk is
rods and pins the same
the same heads and head gasket was used regardless of compression

 

The factory 9:1 piston in my engine looks like an ash tray, dished flat top with a notch noting forward anda dimple standing i nthe middle.

 

yea, brain fart over here.
it's a concave dome

 

Interesting, so is it a taller piston overall? Got any part numbers for the two?
Posted via Mobile Device

 

the buick number cast into the inner skirt is: 1357553

 

Here's a set of old stock pistons on eBay:
http://cgi.ebay.com/ebaymotors/ws/e...0511540947&viewitem=&sspagename=STRK:MEWAX:IT