| [GMCnet] 403, 455, and final drive. [message #205035] |
Thu, 18 April 2013 01:02  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Just catching up on e-mails. I liked what Kerry Pinkerton wrote Tuesday. Personally I think GM did a good job in the choice of power plants in the GMC. I like the HP, and torque charts on these power plants. We drive torque, and over rate HP in our minds. The choice of final drive is another issue. I build stock, and mostly high RPM road race engines. 6 to 9,000 rpm range. A well rebuilt engine when properly done. Will out last the originals. Materials have improved over the years. I'm vary happy with my 78, 403, 3.70 final drive Royale. I gross 19,000 to 22,000. most of the time. At 70 mph my tack is at about 3100 RPM's. In that RPM range, that 403 seems to be in a sweet zone. My torque converter is nicely locked up to as close to 100% as it's going to get. My trans temp is vary good. With the Q jet. I'm in the 7 to 8 mpg. I'm putting on a fuel injection system soon. And putting in a new 2 and a half inch exhaust system. I'm staying with the 2 and a half inch, as I wa
nt to keep my exhaust gas speed up to help in scavaging the engine's exhaust.I think it's interesting what power plants that are being installed in GMC's. I vary much admire the engineering that goes into these efforts. I think the real rewards in these projects are in doing it. More then any financial rewards. It's just like my putting in the fuel injection system in my GMC. I think that doing it will be my reward, more then money saved at the pump. Time will tell.Bob Dunahugh
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