Thread: 396 big block

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so i've finally had the time and set up to take this engine apart! i just finished it was fun. i think i've decided to just build it stock. but i have a question when i took apart the bottom end the # 6 connecting rod was quite loose and there was nothing left of the bearing. the #5 bearing was almost demolished as well. and the crank is scored and damaged on that side as well. is this all caused by the loose connecting rod or are there other factors that could be involved in causing the damage. and also is it bad to try and have a machine shop fix the damaged crank? will it make it weaker?

Originally Posted by chevygirl396

so i've finally had the time and set up to take this engine apart! i just finished it was fun. i think i've decided to just build it stock. but i have a question when i took apart the bottom end the # 6 connecting rod was quite loose and there was nothing left of the bearing. the #5 bearing was almost demolished as well. and the crank is scored and damaged on that side as well. is this all caused by the loose connecting rod or are there other factors that could be involved in causing the damage. and also is it bad to try and have a machine shop fix the damaged crank? will it make it weaker?

bearings have spun so the rods could be junk as well on the crank. you can some times just have it ground but you can only turn so much off . then your looking at welding the crank up steel cranks weld better most time up then cast iron cranks and when you looking to weld a crank less a very good crank the price of the work on crank is worth more then a good use one or a new crank some shops should not weld them but do. i seen bad weld jobs .i can not see how bad it is so you should take it to the machine shop sounds like your looking at a crank and two good rods .why it wipe could be many things. you could buy a 454 crank and use the KB pistons and add some CID to it

it is all going to a machinist tomorrow somebody had mentioned that it could be welded and i wasn't sure how i felt about that. you'd think too much would make it weak. i tried to attach a picture but i'm not sure it worked, or if it will mean anything to you. it doesn't look like it would need much.