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**hatzie** · 06-10-2016, 05:35 AM

One of the annoying things about the GM performance rebuildable mechanical pumps is the inlet and outlet are 180° apart and it's difficult to get them clocked so they don't interfere with something.
GM 12355613, the one you have, is 9PSI at 115GPH with 1/2NPT fittings.
GM 6415325 is 7PSI 30GPH with a slightly smaller diameter body with 1/4NPT fittings.

Holley makes a rebuildable mechanical smallblock fuel pump that allows you to clock the in and out fittings independently from eachother for about the same price point as the 12355613 GM Performance pump.
Holley 12-327-11 is 6.5-8PSI and 110GPH with 3/8NPT fittings

06-10-2016, 05:35 AM	#4090
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,916	Re: Restoring Rusty One of the annoying things about the GM performance rebuildable mechanical pumps is the inlet and outlet are 180° apart and it's difficult to get them clocked so they don't interfere with something. GM 12355613, the one you have, is 9PSI at 115GPH with 1/2NPT fittings. GM 6415325 is 7PSI 30GPH with a slightly smaller diameter body with 1/4NPT fittings. Holley makes a rebuildable mechanical smallblock fuel pump that allows you to clock the in and out fittings independently from eachother for about the same price point as the 12355613 GM Performance pump. Holley 12-327-11 is 6.5-8PSI and 110GPH with 3/8NPT fittings __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.