ddec3 cam in a ddec 4?
What are the advantage of using a ddec3 cam in a ddec4?
Is this a worthwhile discussion?
I believe the reason for using an older cam is that the newer ones were ground to reduce emissions, at the expense of fuel mileage.
I actually did something different when I in-framed my '97 DDEC III. It was originally a straight 470HP/1450 torque, and they told me that to make it a 500HP, all they had to do was reprogram the ECM... but... if I switched to a '98 cam (1st year for DDEC IV), it would up the torque to 1550. I did, and it's worked out great. Pulls great and got better MPGs as a 500 than it did as a 475. Couldn't really notice much difference in how it pulls, but it has always pulled good. I don't believe they'd changed the cams for emissions yet in '98.
I think the main thing you want is to be sure you use an earlier cam if you currently have a newer one that's ground for lower emissions...
I used a marine cam in my ddec iv. Detroit part # R23552556 700 HP produces about 2300 ft/lbs torque. Works great. Also have marine injectors and custom tune ecm. Runs great. the thing pulls like crazy. Great fuel mileage. 7.56 mpg 90 day average on fuel gauges and we run 70 mph. Great shop in Breezewood PA can hook you up. I believe you can use this cam with stock injectors and ecm. They have to drill the bolt whole in the cam gear out so the bigger bolt can go through.
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