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If some one were to swap a 6.5L they likely would not use the electronic controlled injector pump.
The early 6.5L and all 6.2L injector pumps would be the best choise. The stanadine 4911 pump was the best all mechanical pump they made, it is most favored for 6.5 and 6.2 build ups.
The 6.2 and 6.5 engine have 2 main serries of pumps DB2 (mechanical) and DB4 (electronic problem child). The DB4 serries system should be avoided at all costs.
The 4911 pump is DB2 serries.
I do not have the 4911 pump in my 6.5L, I have the other less notable DB2 serries pump, but it gets me around. In almost 6 year I have never had a problem with my DB2 pump.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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