Quote:
Originally Posted by Steve C.
I've posted this before, here again for interest.....
Years ago I had a conversation with Dave Bisschop regarding static compression ratio on aluminum heads.
He felt you can't protect all of these engines once they leave your shop so he often purposely kept it conservative for most that don't want (or shouldn't) push the envelope and stay on top of the tune, bad gas, weather, etc.
In that conversation with conservative in mind and regarding Edelbrock cylinder heads. Based on his dyno testing at the time, he stated 10.25 max for Edelbrock 87cc castings and 10.5 max for their 72cc castings.
The difference being the chamber depth between the two. This was his opinion with the chamber design of the Edelbrock round port heads at the time. Not the newer "heart shaped" design.
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That's interesting. I always felt the larger chambers were less tolerant, good to see Dave felt the same