Re: 356 CI Compression Ratio

Posted by Ross On 2023/12/29 7:34:11

You have it backwards, Scott. Installing the heads from the smaller engine will raise the compression ratio on your 356 as the combustion chamber volumes are smaller. If you install a 53 327 head, the compression ratio will be approx. 8.7 and you will need to use premium fuel. A nice compromise would be a 7.5:1 head from an earlier 327 which would give you about 8.1.