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GM steerin pump
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<blockquote data-quote="patooyee" data-source="post: 221872" data-attributes="member: 483"><p>-6 should be plenty for most of our pressure lines. -8 for return lines for sure. -10 or 12 for supply line that goes from res. to pump, and make sure that line is suction rated / actual supply hose. (They make special hose called suction / feed / supply hose that is rated for vacuum.) I am currently running -6 pressure, -8 return, and -12 supply.</p><p></p><p>The West Texas mod is good and about the only thing you can do for a stock pump. Even it can cause supply issues though. From the myriad of stock and aftermarket pumps I've pulled apart basically all the aftermarket companies are just doing the west texas mod and then addressing the intake by porting in various ways. They are putting the bigger 185 internals in the 135 housings though. Chances are if you bought your p-pump at a parts store is has 135 guts even if the OEM pump had 185 guts. And if you bought your p-pump from an aftermarket company I can almost guarantee you it has 185 guts. You can tell by looking at the back plate of the pump if its not in its can. If it is concave it has 135 internals. If it is convex it has 185 internals.</p></blockquote><p></p>
[QUOTE="patooyee, post: 221872, member: 483"] -6 should be plenty for most of our pressure lines. -8 for return lines for sure. -10 or 12 for supply line that goes from res. to pump, and make sure that line is suction rated / actual supply hose. (They make special hose called suction / feed / supply hose that is rated for vacuum.) I am currently running -6 pressure, -8 return, and -12 supply. The West Texas mod is good and about the only thing you can do for a stock pump. Even it can cause supply issues though. From the myriad of stock and aftermarket pumps I've pulled apart basically all the aftermarket companies are just doing the west texas mod and then addressing the intake by porting in various ways. They are putting the bigger 185 internals in the 135 housings though. Chances are if you bought your p-pump at a parts store is has 135 guts even if the OEM pump had 185 guts. And if you bought your p-pump from an aftermarket company I can almost guarantee you it has 185 guts. You can tell by looking at the back plate of the pump if its not in its can. If it is concave it has 135 internals. If it is convex it has 185 internals. [/QUOTE]
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