I finally got back to my the 350 project that i got off Ebay and as i was mesuring the piston to deck i got 0.050, isn't that too much?
With .030 0ver, .040 worth of gasket and 64cc heads it barelly gets 9:1 compression using the online calculator, does it sound correct?
I did a cc mesurement and got around 18-20cc on piston to deck, i know Felpro makes a skinny gasket that i get .018 wich puts me at 9.4:1 but are they reliable?

 

If your deck is perfectly flat the felpro 1094 gaskets will work fine.

 

Are those inexpensive "rebuilder" pistons? Stock or performance-oriented aftermarket pistons should sit about .025" in the hole at TDC on a stock (undecked) block. "Rebuilder" pistons sit further down (usually about 20 thou further down) because they assume you are decking the block as part of the rebuild process.

 

9:1 can be ok, it depends what you do with it. If you run a mild cam, it's not a bad place to be.

 

i couldn't tell you, i got the engine asembled the way it is, but it's strange that the "builder" used this bottom end setup with 0.040 gaskets, 882 heads and a cam with 106 lsa and on top of it a Tunel Ram intake, i'm replacing the cam with a comp XE284H-10 and the heads with Procomp 64cc and of corse the intake, if i can't get at least 9.5:1 that cam might be too big?

 

That's a bit too much cam to work real well with 9:1. I would rather see you up around 10:1 to work well with the XE284.

Are the pistons dished or flattops? If they're dished, forget about it- buy new pistons as there is just too many reasons they're fighting you. If they're flattops you can get close to 10:1 with a thin head gasket like a Fel Pro 1094 and 64cc heads.

 

I'd tear it down and get the block decked by 0.025", then reassemble. That's the best solution. But if you get 9.4:1 with 64 cc, then shaving the heads 0.030" should put you at 9.9:1. That would be good if you use a more reasonable cam and are near sea level, but the XE284 is way too big for a mystery bottom end. It's also way too big for cast pistons. With cast pistons, going to 6200 rpm at the top of first gear is okay, but otherwise, should be limited to about 5500 rpm. Your rods may be 305 rods and may not have ARP bolts. If this is the case, same rev limits as cast pistons. And if the crank is a turned stock casting, again, same rev limits.
The XE284 cam will pull hard past 6500 rpm, especially since you're getting decent heads. You need at least a cast steel crank, known-good rods, and top-quality hypereutectic pistons if you're going to run that cam.

 

well i removed the oil pan and i can see the crank is a stock GM 3932442, the rods all i can see is "AC" stamped on and they actualy look forged, the pistons on the inside have a "USA" stamp and a "F D" so i can't identify nothing besides the crank

 

the pistons seem to be made by Diamomd but couldn't identify the serie# the rods actualy have ARP bolts

 

ALL SBC rods are forged. But the 305, and '84?-up 350 rods have thinner, lighter, weaker beams.

 

i removed one of the piston/rod and they are cheap cast ones and have a 1.540 compression height, i can get a good deal on a set of KB hp's that are 1.561 and with the 0.015 gaskets they put my quench at 0.044 compression ratio at 10.0:1 and DCR at 8.2:1 with the XE284H-10.
For the experts, how does that sound?

 

I encourage you to do exactly that.

 

Thanks Atilla, that is actualy cheaper than decking the block so it makes sence to me

 

It is, but shouldn't be just for those reasons alone. Anyway, you're gonna do well.