Technical need help

i have a 69 350 chevy that is in a camaro was doing a intake swap and found it was not a roller cam ,,as i was told it would be so i decided to pull a head because i was told it had 12:1 pistons also. i dont think these are 12:1 ,can some one identify this piston and maybe what the compression ratio is with 64cc brodix trac one heads

 

Looks like it might be close on the compression ratio. Years ago they would be called pop up pistons.
It also looks like you twisted off a head stud. On Chevy blocks the bolts go into water so you need to seal the threads and don't screw in the studs until the threads bottom. Screw them in until they stop then back off one turn.

 

the dowel?

 

wich stud i didnt notice and do you know a p[art # on the piston

 

thank god its the dowel he sees shweeeeeew

 

Busted Stud 5 at 2:00 o'clock. Head gasket stain suggests it may have been running (and leaking) that way.

Rotate a piston to TDC and take a picture of the piston dome side view.

Real way to tell is to CC the piston dome. It can be done with the pistons in the block, similar to as shown here -
http://roskoracing.com/TechBlog/?p=115

 

Great info thanks dan

 

ok i will check the stud and get a side pic at TDC thanks for your help

 

awsome post

 

OK i measured the piston at tdc and how much the dome sticks out then measured the dome level with the cylinder

 

its on the 8 or 3mm

 

I vote for 11 to 1 CR

 

now yank that motor out of the Camaro and put it in a '65 or older ride.