Small block 350 build

[pmeffert]

Greetings

I am in the process of building a 350. It will be bored .030 over, with a stock crank, and factory reconditioned Vortec heads. I am getting really confused on what this will do to my compression ratio, and do not want to invest time and money and have the motor blow up on initial start up...so I was hoping that someone could clear a few things up for me. Upon research this is the list of parts I plan on using

4 bolt 350 block .030 over (355)
stock crank
Vortec Heads completely stock (64cc)

Chevy performance cam (24502476)
Hydraulic flat tappet
duration @ 050 lift - 212 int. / 222 ext.
valve lift - 0.435 int. / 0.460 ext.
lobe seperation - 112
3 bolt gear attachment

Hypereutectic aluminum pistons
Flat top, with four valve reliefs

My biggest question is will these work together, and create a strong engine, or will this raise my compression to level that will not function properly?

Thanks for any advice

 

[crucial118]

According to Summit Racing's compression calc, looks like a 10.27:1 cr with -6cc flat top/4vr pistons. That is with a zero deck and compressed gasket thickness of .040.

 

[pmeffert]

The zero deck is where I'm a little confused. How do you know if the deck is zero? 10.27:1 is acceptable with 93 octane fuel...correct?

 

[crucial118]

The zero deck is where I'm a little confused. How do you know if the deck is zero? 10.27:1 is acceptable with 93 octane fuel...correct?

Zero deck is when the piston, at tdc is level with the deck of the block. Highly unlikely, unless you let your machine shop assemble the lower rotating assembly, then measure for how much surface area to take off the block to zero it. You need to measure how far the piston sits in the hole to find the real deck clearance. On a stock block, I believe it to be around .025 or so. I think the 10.27 would be acceptable with the right cam choice and 93 octane. Overlap and duration all plays a role in "what is acceptable."

 

[crucial118]

The zero deck is where I'm a little confused. How do you know if the deck is zero? 10.27:1 is acceptable with 93 octane fuel...correct?

Zero deck is when the piston, at tdc is level with the deck of the block. Highly unlikely, unless you let your machine shop assemble the lower rotating assembly, then measure for how much surface area to take off the block to zero it. You need to measure how far the piston sits in the hole to find the real deck clearance. On a stock block, I believe it to be around .025 or so. I think the 10.27 would be acceptable with the right cam choice and 93 octane. Overlap and duration all plays a role in "what is acceptable." Don't just look at the static cr, but also look at the dynamic cr with your cam info.