ECZ-G heads


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By flathead_jr - 16 Years Ago
What's the difference between the ECZ-C heads, and the ECZ-G heads? I am fairly sure both types of heads came off of a 292, but I am still learning about the Y-block.
By pcmenten - 16 Years Ago
The port size and the intake valve size is larger on the ECZ-G heads. The chamber shape on the ECZ-G head includes an overhanging lip.



Many builders are happy to use the ECZ-C heads. The chambers are pretty close in size so the compression ratio is similar. The intake valve on the -G heads is 1.92, the intake on the -C heads are 1.72. You can install a 1.84 valve on the -C heads and do some pocket porting to help out with its flow.
By Ted - 16 Years Ago

Another difference will be that all the ECG-C heads will be of the unposted variety while the ECZ-G heads made later in the production run of those particular heads will be posted.

Here’s more on posted heads and how to identify.

http://www.y-blocksforever.com/forums/Topic6711-3-1.aspx