deck the block vs aftermarket pistons..

It seems that most production blocks have decks that are over spec. The deck is measured from the crank center line to the top of the cylinder. The factory spec is 9.57", mine was 0.015 higher on one side then the other. I had them true the deck, it wasn't cut to get the 9.57 number. I'm running KB pistons and want to use it on the street. If you use KB pistons you have to have the assembly balanced, the KB's are lighter. If you use the KB pistons try to find a set of 308 heads with the 1.88 / 1.6 valves. It looks like you want to build a high rpm motor. Talk to a GOOD machinist, he'll tell you how to do it.

Take a good look at Sealed Power pistons. I did a search a while ago and found stock pistons with a 1.72 Compression height (Z285NP40) they are +.040 but I'm sure you can get them in 3.91 too. They are listed for 19.99 apiece!