Compression Ratio
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 1,132
Likes: 0
Compression Ratio
Alright guys, please don't flame me here.. I'm kinda new to all of this and very interested!
I was wondering what determined the compression ratio. I have a 350 c.i. engine and I found out that the my block is from a 69 vette and the heads are either from a 72 or a 73 vette. I have no idea what cam I have... Is there any way to find this out without taking the engine apart?
I was wondering what determined the compression ratio. I have a 350 c.i. engine and I found out that the my block is from a 69 vette and the heads are either from a 72 or a 73 vette. I have no idea what cam I have... Is there any way to find this out without taking the engine apart?
Burning Brakes
Joined: Dec 2003
Posts: 782
Likes: 0
From: Elizabeth New Jersey
Pistons determin the Compression ratio. And there was more than one engine available in 69. If you give me your engine casting # I could tell ya what it came with it. But it's impossible to know what's in it unless you open it ( old owner may have mod it )
Burning Brakes
Joined: Apr 2003
Posts: 844
Likes: 0
From: Central KY
CR for you is mainly a function of cylinder head chamber volume in cc's - easiest to know what was stock and what you have now, and dome volume of your piston (also in cc's). For my car, the stock CR is a whopping 8.25:1. They used flat-top pistons (dome volume is zero), and 123cc heads. If I use 110cc heads, then I get a higher CR - about 9.3:1 or so. If I use my heads and 25cc domed pistons, I get ~9.5:1 CR...
The wild card for you may be figuring out what pistons are in your block. You may have to pull a head to see...or use a borsescope like a few guys here have...
The wild card for you may be figuring out what pistons are in your block. You may have to pull a head to see...or use a borsescope like a few guys here have...
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 1,132
Likes: 0
Please try Corvus....
#' passenger side towards fan:
V0219TBM
C90154073
#'s driver's side near windshield
43GM
3970010
#'s passenger side near windshield
B \ 68 ????
(feel free to take a look here: http://members.***.net/gdeb/asdf.jpg )
#' passenger side towards fan:
V0219TBM
C90154073
#'s driver's side near windshield
43GM
3970010
#'s passenger side near windshield
B \ 68 ????
(feel free to take a look here: http://members.***.net/gdeb/asdf.jpg )
