BronsonA2150 Posted January 22 Share Posted January 22 (edited) Were there any differences in internal components or turbo between the 2 horsepower options or was it just fuel settings? edit: also curious if 400 hp was the most it was offered in for that year/era Edited January 22 by BronsonA2150 Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/ Share on other sites More sharing options...
Joey Mack Posted January 22 Share Posted January 22 I will try to post pictures. Do you have a full mechanical injection pump? Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567303 Share on other sites More sharing options...
BronsonA2150 Posted January 22 Author Share Posted January 22 On 1/22/2025 at 3:57 PM, Joey Mack said: I will try to post pictures. Do you have a full mechanical injection pump? Expand Mine has the electronic governor 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567305 Share on other sites More sharing options...
fjh Posted January 22 Share Posted January 22 On 1/22/2025 at 3:57 PM, Joey Mack said: I will try to post pictures. Do you have a full mechanical injection pump? Expand On 1/22/2025 at 4:12 PM, BronsonA2150 said: Mine has the electronic governor Expand I believe the cam key was offset on the 400 how ever I could be wrong Joey may know more! Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567307 Share on other sites More sharing options...
Joey Mack Posted January 22 Share Posted January 22 I dont recall that on the E-7. But my memory is fading. E-Tech,,, Yes.. Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567310 Share on other sites More sharing options...
fjh Posted January 22 Share Posted January 22 On 1/22/2025 at 4:31 PM, Joey Mack said: I dont recall that on the E-7. But my memory is fading. E-Tech,,, Yes.. Expand Yup me too! Sucks getting old! Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567314 Share on other sites More sharing options...
Joey Mack Posted January 22 Share Posted January 22 https://photos.app.goo.gl/XMT7WoQrM1khDUeo9 See if this link works.. look at timing degree difference and piston part numbers. This is from my Mack Tune up book for 1994.. Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567315 Share on other sites More sharing options...
Joey Mack Posted January 22 Share Posted January 22 https://photos.app.goo.gl/XMT7WoQrM1khDUeo9 try this link.. Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567317 Share on other sites More sharing options...
BronsonA2150 Posted January 22 Author Share Posted January 22 On 1/22/2025 at 4:44 PM, Joey Mack said: https://photos.app.goo.gl/XMT7WoQrM1khDUeo9 try this link.. Expand Good info thanks. It does look like different pistons and nozzles at least? Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567336 Share on other sites More sharing options...
Joey Mack Posted January 22 Share Posted January 22 There is also a 1 degree difference in injection timing.. take another look Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567342 Share on other sites More sharing options...
BronsonA2150 Posted January 22 Author Share Posted January 22 On 1/22/2025 at 7:30 PM, Joey Mack said: There is also a 1 degree difference in injection timing.. take another look Expand Yep I noticed that too. Just figured that would be an easy change unless it’s electronic 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567354 Share on other sites More sharing options...
BronsonA2150 Posted January 24 Author Share Posted January 24 On 1/22/2025 at 7:30 PM, Joey Mack said: There is also a 1 degree difference in injection timing.. take another look Expand So was a 400 the highest horsepower option you could get in that year? Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567504 Share on other sites More sharing options...
Joey Mack Posted January 24 Share Posted January 24 454 was. Different turbo, timing is 10 degrees btdc. Quote Link to comment https://www.bigmacktrucks.com/topic/75049-350-vs-400-e7-differences-in-a-94/#findComment-567505 Share on other sites More sharing options...
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