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Z1 won't give us flow figures for their Stage 4 heads, so where else do you guys recommend that we get our work done? We have 2 guys wanting the Stage 4 heads (solid lifters with OS valves and extreme port work) and another guy wanting the Stage 3 heads (JWT cams with standard valves)- but we're kinda left stranded - not wanting to send heads to a workshop that doesn't have (or just won't send) flow figures to justify their work... :(
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