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Re: D1SC build
I want to say the stock vacuum lines were 3/16. The ports coming off of the intake manifold are 3/8, except for the PCV port which is 3/4. Here is a link to the vacuum block I bought:
http://www.treadstoneperformance.com...t+Vacuum+Block
The big fittings are 3/8, The smaller fittings on it are 5/32, and the silicone hose I got was 4mm from them. It'll fit over 3/16, just use some liquid silicone to lube the lines up before you slip them on. I had tried to find some tiny hose clamps but the ones I found are just a hair too small to fit over the lines without damaging them.
I used the pcv port on the intake manifold exclusively for the bypass valve's vacuum.
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Black 2003 Mach 1, 483hp/451tq @6100 8.9psi
-Stock longblock, stock transmission, Procharger D1SC 4.15" pulley, Accufab 60mm TB, P/P intake manifold, full MAC exhaust, return style fuel system, Maximum Motorsports/Steeda suspension, Torsen T2R 31 spline diff
Red 2007 Focus ST, daily driver, 236hp/234tq @10psi
-FSWerks gt2871r kit, Cosworth intake manifold, FSWerks Stealth exhaust, FRPP lowering springs
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