The guys who still use a single block heater on the 6.5L claim to get about a +30'F peak temperature increase after 2 to 3 hours.
Its better than nothing.
My 6.5L cold starting system consists of two 600w block heaters, the 3500 watt coolant heater, electric coolant pump, two 50 amp intake heater coils and the factory glow plugs, 5w-40 motor oil.
DIY: Teaching an old J-code new tricks - Diesel Place : Chevrolet and GMC Diesel Truck Forums
If you are looking for more fuel economy and power I tested all the factory intake manifolds for the 6.2 and 6.5. The factory turbo manifold produced the lowest fuel economy and seemed to have the least get up and go.
Question: C-code to J-code, now F-code - Diesel Place : Chevrolet and GMC Diesel Truck Forums
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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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