I had an engine built and the builder told me I would have 10.5:1
Other people are telling me I'd be lucky to have 9:1. Here are my specs:
350 bored .030
stock crank (350)
flat top pistons

S/R torquer Heads decked, 76cc chambers and 170cc runners (people say my problem is here)

edelbrock performer intake
holley 650 double pumper
mild cam Elgin .462 intk .470 exh

Thanks

 

those are large combustion chambers which mean a low compression ratio. If you want to calculate your CR, go to: www.smokemup.com

go to the hp calculator

 

Your final compression ratio will depend on the piston deck clearance and thickness of your head gasket.
If you're using common .045" deck clearance replacement
pistons on a stock non decked block with 76 cc heads
and a .040" gasket your compression will be low.
Like 8.3:1

You can correct this when building the motor by decking the block,
milling the heads and or using a thin head gasket.
Here's an example:

.025" deck height, 76 cc heads milled .060" to 68cc's
felpro .015" shim gasket will give you a 9.94:1 cr.

 

The heads are decked(dont know by how much) and the block is decked .015 per side. Should I sell the heads and buy new ones or deck the hell out of them. Also I have and edelbrock 87+ performer intake, wil it fit on other heads? Can I machine the other heads I buy so that they fit?

 

The only way to know what your actual cr is, is to remove the heads and measure. CC the heads and measure your deck clearance as it is now. The head cc's can be adjusted by either flat milling or angle milling them.
Your performer intake's center bolt holes can be enlarged to
fit earlier head's bolt pattern.
Your S/R heads are basicly good castings and will make the power after they are fully ported and milled to get you the port flow and cr nessessary to hit your performance goals. But out of the box, the ports flow about the same as the chevy heads they were designed to replace. The potential is there to get the performance you're after, but will take some work. You'll have to weigh out the economics of fixing your heads or going with something else.
You may have some other tuning issues besides.
(Exhaust flow, carb jetting, fuel delivery, torque converter stall speed. tire traction)....... Good Luck

 

I see that you have discovered the same thing that I did about S/R heads...

 

How much does it cost to fully port and mill the S/R torquer heads. Is it better for me to sell them and just get aluminum heads? What do you think I can get for them? They are decked .015 with Mioden valves, mint condition used only about 200 miles.