Ok guys i need some help here. I have a 400 sbc in my chevelle it's putting out around 550 hp. But in the past few weeks it has developed a knock. I have checked everything out and it seems to be coming from the bottom end. So i guess it's time for a rebuild, so here is my question. Should i build a 400 or should i go 383? My 400 is a 2 bolt block. I just bought a set of 200 etec heads and have had them on there for only about 3 months so i will be reusing these. My plans are an engine with about the same hp as what i have now N/A, and then adding a power adder of some sort. What do you guys think and why? Thanks for your help.
I would say keep the 400, the long stroke over the 383 will develop more low end torque that will help move your chevelle(bit heavier than a camaro/nova). I would say rebuild it as a low compression blower motor and add a D1SC to make a motor putting out 800+ horsepower that is pump gas compatible.
EDIT: 383s and 400s have the same stroke, I must have been thinking of a 377. Either way I still say the 400 is a better choice.
I agree the 400 is a better choice. If you were to go with a 383 remember that
the block will be bored making the walls thinner. Were the 400 is a bit more meaty and will take the presure from a Procharger much easier. Plus you already have it.
I agree with above and definitely the block checked first. You can alway have the machine shop put a 4 bolt splayed mains on it. I would also go with a 5.7 rod since you are having to change pistons as it will cut down on the rod angluation.
Ok thanks guys, i plan to pull the engine this weekend and drop in a temp. 350 so i can take my time and build the 400 once the right way. I will be going forged all the way through. I'm not taking any chances on this build, it will be putting out to much power to go cheap. Thanks again
Brian Hobaugh SCCA National Tour June 2014
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