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400sb vs 350 4 bolt main?

Guest
I have an opportunity to swap my 350 4 bolt main for a sb 400. Would this be a good trade? I know I can get more torque & hp out of a 400, but is it a reliable engine? Will it get crapper gas mileage than a 350? The 400sb is currently in a 75 blazer. Seems to run pretty strong. Let me what you guys think.

 


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