I just received replacement pistons for my 58 430. These are flat tops instead of the original step the old ones had. Guy at PST that I purchased them from said these are correct replacement,and I would only lose .5 on my compression ratio.
I them called Egge,which is where these pistons were made. He said the dome or step design was used on 63 and newer engines. I don't know what this profile looks like. Wondered if I can use the later profile in my engine. Has anyone done this on their early 430 engine?
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If the pistons you have bought do not have the same dome shape, they are incorrect. These are not pop-ups but specially designed as they actually make the combustion chamber.
The 63/65 430 4V had a more pronounced dome shape as they were redesigned (along with a small chamber in the head) to create better flame travel.
Look throught all posts and there will be a host of info on MEL piston shape and why they are unique.
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