masterwelder Posted March 4, 2019 Share Posted March 4, 2019 My 90 RB has a mechanical E7-300L, 12513 Eaton with 4.64 rears. I have a 91 CH with a mechanical E7-400. My question is could the parts from the 400 (pump, turbo, injectors) be put on the 300 block or are there internal differences like different pistons, compression etc. Would be nice to have more hp and rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/55936-300-to-400/ Share on other sites More sharing options...
6368 Posted March 4, 2019 Share Posted March 4, 2019 My 1989 overhaul manual says that the 300L and the 400 are both 16.5 to 1 compression ratio and interestingly the both use the same nozzles. I don't know if cam timing is the same though. I would check with a parts dept to see if they both use the same timing gears. Quote Link to comment https://www.bigmacktrucks.com/topic/55936-300-to-400/#findComment-417208 Share on other sites More sharing options...
masterwelder Posted March 5, 2019 Author Share Posted March 5, 2019 Thank you for looking. That is interesting to have the same compression and use the same nozzles. Ill give the parts man a call tomorrow. Quote Link to comment https://www.bigmacktrucks.com/topic/55936-300-to-400/#findComment-417290 Share on other sites More sharing options...
41chevy Posted March 5, 2019 Share Posted March 5, 2019 (edited) E-7 300 HP with 1160 torque has the cam gear key way offset left, to go any higher you got to pull the cam and install straight cam key way. The turbo and injectors would be the same to the 400 HP level. Edited March 5, 2019 by 41chevy Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/55936-300-to-400/#findComment-417296 Share on other sites More sharing options...
masterwelder Posted March 5, 2019 Author Share Posted March 5, 2019 41- is that using the cam out of the 400 motor or dose the 300 cam somehow have the ability for the straight key way? Quote Link to comment https://www.bigmacktrucks.com/topic/55936-300-to-400/#findComment-417310 Share on other sites More sharing options...
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