Speedmaster, Edelbrock LA, or magnum cylinder head MILLING LIMITS & common Milling Optimization

StreetSleeper said

Forged pistons look to be the same compression height when shopping.
They say a KB-107 is still .012” down in the hole-hence milling needed to begin with.

I want to optimize compression, not just let it go-compromise the compression with simply putting everything together as is.

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You need to call other piston manufacturers and find the right pistons for your desired compression ratio, it may take custom pistons as these days there is not a big selection to chose from for these older engines anymore, most large selections are for newer engines like G3 hemi’s.