Joey Mack Posted Sunday at 01:11 PM Share Posted Sunday at 01:11 PM No. 690 series. But i have never tried to swap them and havent seen one done, so I cant say no. May need to use E-Tech rocker shafts. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588371 Share on other sites More sharing options...
The Heinz Posted Monday at 03:03 PM Share Posted Monday at 03:03 PM On 1/4/2026 at 8:03 AM, 880joe said: Do etech's use the same Jake? ETECH uses 690's if I recall right, which I should since my research problem back then is what led me here. Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588505 Share on other sites More sharing options...
mackdaddytruckfixer Posted Monday at 05:58 PM Author Share Posted Monday at 05:58 PM On 1/4/2026 at 7:45 AM, Joey Mack said: Ok. So you only have a valve cover. If it had engine brakes there would be a 2" spacer under the valve cover. You will need those, also the exhaust rockers and bridges are different, you will need the longer bolts for the jake heads and valve covers, 2 micro switches, one for the injection pump and one for the clutch pedal, and 3 position switch in the dash. Not sure if the celenoid wires are laying on top of the engine, i doubt it. And you need 2 jumper wires for under the valve cover. Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588529 Share on other sites More sharing options...
mackdaddytruckfixer Posted Monday at 06:01 PM Author Share Posted Monday at 06:01 PM Wasn't planning on buying jake brake kit but there isn't one on this engine. Hoping to find the whole setup im one bang. Anyone know where a good semi junkyard is ??? Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588530 Share on other sites More sharing options...
mackdaddytruckfixer Posted Monday at 06:12 PM Author Share Posted Monday at 06:12 PM On 1/4/2026 at 7:45 AM, Joey Mack said: Ok. So you only have a valve cover. If it had engine brakes there would be a 2" spacer under the valve cover. You will need those, also the exhaust rockers and bridges are different, you will need the longer bolts for the jake heads and valve covers, 2 micro switches, one for the injection pump and one for the clutch pedal, and 3 position switch in the dash. Not sure if the celenoid wires are laying on top of the engine, i doubt it. And you need 2 jumper wires for under the valve cover. Thanks Joey. I'd like to find a retired unit in a junkyard all get everything at once. I'll buy new or used. Any help locating parts would be great. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588533 Share on other sites More sharing options...
Joey Mack Posted Monday at 06:40 PM Share Posted Monday at 06:40 PM yes sir. that makes sense. I knew you would anyway. I just wanted to post a shopping list for you, to help you. I'm not sure if I forgot anything. Keep in touch. this is a good topic.. Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588539 Share on other sites More sharing options...
Joey Mack Posted Monday at 06:46 PM Share Posted Monday at 06:46 PM i have 1 pair of 680 jake heads, but they are lightly rusted. I guess I could put them in the wash tank and clean them up for inspection. I saved them from the scrap pile a few years ago. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588542 Share on other sites More sharing options...
Brocky Posted yesterday at 12:36 AM Share Posted yesterday at 12:36 AM 6 hours ago, mackdaddytruckfixer said: Wasn't planning on buying jake brake kit but there isn't one on this engine. Hoping to find the whole setup im one bang. Anyone know where a good semi junkyard is ??? Have you pulled up VanDerHaag's website. They are a big truck salvage outfit based in Iowa and advertise in the ATHS WOT. If I remember right they were a big sponsor of the ATHS Des Moines Iowa show in the mid 20teens? 2 Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588590 Share on other sites More sharing options...
mackdaddytruckfixer Posted 21 hours ago Author Share Posted 21 hours ago 9 hours ago, Brocky said: Have you pulled up VanDerHaag's website. They are a big truck salvage outfit based in Iowa and advertise in the ATHS WOT. If I remember right they were a big sponsor of the ATHS Des Moines Iowa show in the mid 20teens? ,Im going to have to call them. Looking for 1997 parts there's not much listed. If putting a jake on this engine is going to run over 3k I'll probably start looking for another core and be much more careful when I buy it. Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588605 Share on other sites More sharing options...
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