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Old 09-16-2012, 10:09 PM   #1 (permalink)
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4bt upgrades

i have a 4BTA (JWAC),i plan on putting in my 83' chevy K20 trail rig ,anyone know how much HP & torque i can except from the following mods, M&H stage 4 fuel pin & dynamic timing advance,3800 GOV spring ,60# valve springs,6BT hx35 turbo ,diamond eye 4" downpipe,and TENNESEE DIESEL high pressure piston pump & 75 HP injectors
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Old 09-17-2012, 08:00 AM   #2 (permalink)
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No guess from me but the 4bt modified will make a fool out of the 454!!! On half the fuel.
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Old 09-17-2012, 09:33 AM   #3 (permalink)
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in jan. of this year i pulled out a 454 out of my truck and installed a gm 6.2l diesel With a ATS turbo set up ,great milage ,awsome off road , just not enough power to pull the mountain roads i take to get to the fourwheeling spots , im hoping this high $ swap will remedy that problem for me
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Old 09-17-2012, 09:42 PM   #4 (permalink)
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HERES what you can expect, cracked cylinder head, boost at hi-rpm's only, very poor fuel milage, #3&4 cyl burnned pistons and short engine life. just to get started off, your waisteing your money........ leave it stock
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Old 09-17-2012, 10:27 PM   #5 (permalink)
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you think stock will move a 6800 lb truck, ??
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Old 09-17-2012, 10:28 PM   #6 (permalink)
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HERES what you can expect, cracked cylinder head, boost at hi-rpm's only, very poor fuel milage, #3&4 cyl burnned pistons and short engine life. just to get started off, your waisteing your money........ leave it stock
anyone second that
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Old 09-18-2012, 08:31 AM   #7 (permalink)
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you think stock will move a 6800 lb truck, ??
I had a stock 4bt with a 4speed manual, in an old bread truck. Only thing I did was raise the high idle as far as it would go with the stock gov. spring.
It was running everyday at 12,000 lbs and got 14 mpg every tank. Never overheated. It would out run--according to my employees--- the other truck with a 400 sbc and turbo 400. Both had the same gears, 4.10. The 400 was slightly modified too and got 6-7 mpg.
That was a 105 hp motor.
It would shake at idle and eat clutches because they kids that drove it thought it was cool to slip it.
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Old 09-18-2012, 09:06 AM   #8 (permalink)
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anyone second that
If you just turn the fuel up on the engine and dont do anything else and have your egts above 1300 all the time you will have problems. If you build it right and drive it smart the engine can run a long time.

You can put a coolant bypass in to get fresh coolant to 3 and 4 cyclinders to cheap them cool. If you have bigger injector a turbo and exhuast manifold would be a good idea to get egts down. High rpms get valve springs. There are ways to make "safe power." Be smart in how you build and drive your truck and you will still be able to get good fuel mileage and still be relieable. There are a few 4bts with 300-350hp running everyday.
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Old 09-18-2012, 09:48 AM   #9 (permalink)
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It EAT clutches because of the torque it made, very common with 4bt's and yes it will do you a good job "stock" you,ll regret it if you soup it up. I,ve had over 40 of these engines i know them well...... ALL THESE SOUP UP PLACES JUST WANT TO SELL YOU STUFF.......
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Old 09-18-2012, 09:51 AM   #10 (permalink)
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If you just turn the fuel up on the engine and dont do anything else and have your egts above 1300 all the time you will have problems. If you build it right and drive it smart the engine can run a long time.

You can put a coolant bypass in to get fresh coolant to 3 and 4 cyclinders to cheap them cool. If you have bigger injector a turbo and exhuast manifold would be a good idea to get egts down. High rpms get valve springs. There are ways to make "safe power." Be smart in how you build and drive your truck and you will still be able to get good fuel mileage and still be relieable. There are a few 4bts with 300-350hp running everyday.
thanks for the info ,im new to the 4bt stuff ,im just looking to get around 475-500 ft.lbs,pretty much what the mild 454 had before i put the GM 6.2 in it,i did'nt just turn the fuel up, i went to a HX 35 turbo ,bigger injectors, & a cummins piston pump, where can i find info on the coolant bypass? ;

Last edited by tranzman; 09-18-2012 at 10:02 AM.
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Old 09-18-2012, 09:57 AM   #11 (permalink)
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It EAT clutches because of the torque it made, very common with 4bt's and yes it will do you a good job "stock" you,ll regret it if you soup it up. I,ve had over 40 of these engines i know them well...... ALL THESE SOUP UP PLACES JUST WANT TO SELL YOU STUFF.......
do you think stock will move a 6800 lb 4x4 W/1ton axles ,NV4500 ,np203/205 Doubler,& 38 inch supers swampers , my 4BTA stock is 120HP & 300ft/lb torque ,my current 6.2 turbo diesel with about the same amount of torque dont cut on long mountain roads
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Old 09-19-2012, 08:45 AM   #12 (permalink)
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Originally Posted by tranzman View Post
thanks for the info ,im new to the 4bt stuff ,im just looking to get around 475-500 ft.lbs,pretty much what the mild 454 had before i put the GM 6.2 in it,i did'nt just turn the fuel up, i went to a HX 35 turbo ,bigger injectors, & a cummins piston pump, where can i find info on the coolant bypass? ;
Coolant bypass isnt that hard to make (your just rerouting some of the coolant to the back of the engine) and really is only need in high hp and high rpms because it also lowers thte coolants pressure in the block.

Cummins coolant bypass

12 24 Valve 5.9L Cummins Coolant Bypass Kit

I think the the 4bt will do better than the 6.2 on mount roads for a couple reasons. 1 when chevy came out with the 6.2 and 6.5 diesel it was ment to be more of and effecient diesel not one made for hauling and does get any torwue until higher rpm. 2 the 4bt is a long stroke engine made to make torque and be a work horse, where the 6.2 engine is a much shorter stroke made for more hp rather than torque.
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