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377 = smaller engine ,so less torque at a higher RPM.Its all simple math,,,start with what you want,add in what you have and see what it will take to get you to where you want to go.EG: If I have 400 rwhp in a 1970 Nova,set up with 4.11 gears,matching transmission to engine,the car hooks well( assuming drag race) has traction bars that are tune able, the car weighs 3500 pounds or less with driver and fuel,ready to go,he has slicks,this car will go 12.0s.

to figure out what your car will do,add or subtract 1/10 for every 10 hp up or down.If you use a (Winderupper} you will need gearing to accommodate the different powerband.for every 100 pounds difference add or subtract 1/10th.If your car is not as good at hooking as the nova,expect slower times.If you do not use slicks,expect 13s.If you dont need slicks expect slower,much slower.Add 3/10ths for exhaust system on small blocks.This is not an accurate guide but it will give you an idea where you might be or where you might get to with some tuning.
 

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what could i expect from a 400sbc bored +.030 with flat top pistons. stock heads and stock rods stock crank maybe a mild cam for a 79 chevy 4x4. running 3.73 gears with 25 inch tires. i have 4.11 gears for rear and 4.10 for front but an a tight budget and never put gears in diffs. so im not real confident on installing them. any thought would be appreciated.
 

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I ment to say 35 inch tires. I was reading earlier about the small block 400, which i do have a compllete one. has been rebuilt once, but the kid who had it spun #3 rod bearing. plans are to rebuild it again at put it in a 79 chevy silverado 1/2 ton 4x4. any suggestions on more horsepower and torque for this engine.
 
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