Originally Posted By slantzilla
I am intersted in the idea of lowering fuel pressure and putting in bigger needle/seat assemblies. Question is, how big should I go? I have a 600 DP and am at 6 psi now with .110 needles. I want to drop it to 4 psi.

Thanks! wave


In theory your flow rate will stay the same with inversely proportional changes between pressure and cross sectional area. Assuming my phone math is correct, that would be a theoretical 0.127" N&S, or a 0.130" Holley N&S.