hey Ferm, need some input

[spareparts]

Ferm, i was going to order up a set of those pistons and decided to check compression with the calculator, I'm a bit concerned about the final compression. They list it as a +10cc dish, figuring 58 ccs for my vortecs, 3.48 stroke, 4.030 bore. .037 for the head gasket, .040 for the deck height. I noticed the compression height was 1.540 vs 1.560 on an older piston, so I added the extra .020 to the deck height. I ended up with 9.5-1, a little higher than I was expecting. Give me some input here, were my calculations off or will this motor run at 9.5-1(on regular gas). Thanks

[THEFERMANATOR]

9.5:1 isn't that much higher than stock for a VORTEC. they came with a shade over 9:1 from the factory I believe as the VORTEC fast burn heads have the small 60 or 64 CC(5.0L were 60, and 5.7L were 64's) combustion chambers from thae factory VS the 78CC's of the older truck heads. I know alot of guys run them up around 10:1, but I believe they run mid grade fuel in them as well.