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What is the smallest my chambers can be before I would run into problems of needing new push rods etc.
It depends on what your pushrod geometry looks like before you begin. Many people assume that theirs is perfect to begin with, and there is a magic formula that tells them if you cut this much off the block or heads, you can get this length pushrod. All engines are made with production tolerances in most all areas, so without knowing where you are to start with, and can determine a baseline, you may be able to only cut as little as .030 from a head/block before you start to see a need to compensate. And thats also assuming the block or head hasn't already been cut previously. For instance, your engine could have been on the verge of being rejected or be on the low side of the tolerance scale as far as pushrod geometry goes, and you might cut .020-.030 off of your block or head and see valve tip scuffing issues, while another guy may cut .050 or more off of his combo and still not have any issues at all. You just have to see where you are before you start.
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There's no such thing as too much cam....only not enough engine!
