400 sbc help
#1
400 sbc help
Hey guys I have gotten my hands on a 400 bored .040 over. The engine chewed up a cam and a few journals are screwed, I have another stock crank ground .010 under and I'm wondering if I can drop in the .010 under crank without having to balance the entire rotating assembly again (of course after I clean everything up and make sure there's no more metal shaving in it). I don't plan on high rpms nothing more than 5500 with a few 6k every now and then. Also can I use a stock 400 oil pan from a chevelle on it without hitting the k member. Thanks in advance.
:note this is a cheap build that's why I'm asking.
:note this is a cheap build that's why I'm asking.
#2
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Re: 400 sbc help
if I can drop in
Is it "A Good Idea"? Another matter altogether.
Feeling lucky today? That's the better question to ask. I wouldn't do that.
after I clean everything up and make sure there's no more metal shaving in it
This is ESSENTIAL, because metal shavings don't dissolve in the machine shop's tank. ANY metal chips remaining in the block will have ONLY ONE WAY to go after you reassemble it: which is, RIGHT STRAIGHT DIRECTLY INTO your new bearings and rotating parts.
Then take it back to the machine shop for installation of cam bearings. Put the plugs in yourself, and DO NOT FORGET the one behind the rear main cap. Drill about a #70 hole in the 2 plugs on the sides of the cam in front of the block. Use screw-in plugs, if the block isn't already equipped for those, tap them to ¼" pipe BEFORE the rifle brush process that removes metal chips.
Every build is "cheap". Quite often, SO "CHEAP" that the builder gets to do it AGAIN, and spend all the same money AGAIN, PLUS the money that should have been spent in the first place so that it would only have had to be done once. Don't be one of "those" people.
Yes the Chevelle pan will fit. Be aware though, a stock oil dipstick for that motor will not fit the stock exh manifolds for one of these cars. Headers of course cure that problem.
#3
Re: 400 sbc help
Hey guys I have gotten my hands on a 400 bored .040 over. The engine chewed up a cam and a few journals are screwed, I have another stock crank ground .010 under and I'm wondering if I can drop in the .010 under crank without having to balance the entire rotating assembly again (of course after I clean everything up and make sure there's no more metal shaving in it). I don't plan on high rpms nothing more than 5500 with a few 6k every now and then. Also can I use a stock 400 oil pan from a chevelle on it without hitting the k member. Thanks in advance.
:note this is a cheap build that's why I'm asking.
:note this is a cheap build that's why I'm asking.
If the first crank was balanced I would surely have the second one balanced as well rather then run it with a vibration and have to disassemble and have the rotator balanced.
The block should be striped and cleaned.
If the oil filter Adapter was plugged nothing would have got to the bearings !!!
If your running a flat tappet cam go with a P55 cam core and if your using HYD lifters go with the ones from GM with the steel bottoms.
#4
Re: 400 sbc help
Thanks for the help guys, sadly I don't think I'm going to keep it, I took the heads off today and there's some damage in cylinder #7. Thankfully I got it for pretty cheap. I still have s 400 block but now I have to get it bored and decked. I also plan on using a roller camshaft to make my life a little easier.
#5
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Re: 400 sbc help
Yeah that's messed up, with a capital F. No wonder you got it cheap. It's not a motor, it's just a block core with a bunch of extra garbage inside it weighing it down. It needs a total rebuild from the ground up.
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