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. 1 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. 1 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.. 1 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 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...
Popular Post Brocky Posted Tuesday at 12:36 AM Popular Post Share Posted Tuesday 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? 3 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 Tuesday at 10:28 AM Author Share Posted Tuesday at 10:28 AM 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...
R.E.D Posted Wednesday at 11:12 PM Share Posted Wednesday at 11:12 PM https://www.facebook.com/share/14SusdGPbNi/ Something like this is what you're looking for. Price is a bit high, but it has engine brake. Like previously mentioned, you can tell it has engine brake spacer between the valve cover and the head. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588693 Share on other sites More sharing options...
Joey Mack Posted Wednesday at 11:26 PM Share Posted Wednesday at 11:26 PM Now thats right up my alley... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588694 Share on other sites More sharing options...
Lmackattack Posted Wednesday at 11:58 PM Share Posted Wednesday at 11:58 PM Put a c15 in and sleep well every night 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588699 Share on other sites More sharing options...
R.E.D Posted yesterday at 02:29 AM Share Posted yesterday at 02:29 AM 2 hours ago, Lmackattack said: Put a c15 in and sleep well every night I'm not sure what chassis he's working with. But unless he has a CL or rw ,he Will probably have to shoehorn it in there..lol..... And if so, b model cats seem to be making a comeback. There's a couple guys out there that are building 600 hp b model kitties 😻. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588709 Share on other sites More sharing options...
67RModel Posted 17 hours ago Share Posted 17 hours ago 15 hours ago, R.E.D said: https://www.facebook.com/share/14SusdGPbNi/ The listing says its an EM7, which would be a Maxidyne. I think the Maxidynes have different pistons and camshafts than the E7s FYI. Also the fuel pump on an EM7 is governed at 1750. If your trying to make 500hp you'll probably want more RPMs than 1750. You probably will be changing all that on this build but if you buy an engine for parts/core be cognizant of that. Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588717 Share on other sites More sharing options...
880joe Posted 15 hours ago Share Posted 15 hours ago I will look to see if I have some 680 Jake's Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588719 Share on other sites More sharing options...
R.E.D Posted 6 hours ago Share Posted 6 hours ago 11 hours ago, 67RModel said: The listing says its an EM7, which would be a Maxidyne. I think the Maxidynes have different pistons and camshafts than the E7s FYI. Also the fuel pump on an EM7 is governed at 1750. If your trying to make 500hp you'll probably want more RPMs than 1750. You probably will be changing all that on this build but if you buy an engine for parts/core be cognizant of that. Yes, agreed , i meant for the listing to show what engine brake valve cover spacer looked like.. would like to also add that maxidynes are usually paired with 5,6,7,8 speed maxitorques trans which have an end overdrive of .64 Quote Link to comment https://www.bigmacktrucks.com/topic/76250-e7-350hp-to-500hp-that-will-live/page/4/#findComment-588731 Share on other sites More sharing options...
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