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Old 04-11-2005, 04:17 PM   #1 (permalink)
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Can you bore a 400 SBC .060?

I have been looking for a 400 for a while now and have been burned on 2 so far (1 cracked block/1 guy trying to tell me a 305 has the same casting number as a 400). I have found another one that has been rebuilt in the last 4 years and the reciepts are there and the crank is still good but it was bored over .030 already and now I am hoping that it can safely be bored out another .030 (.060 total). I know that this would turn from the current 406 to 412 if it is possible.

Jay
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Old 04-11-2005, 10:48 PM   #2 (permalink)
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yes its possible. no its not advisable. I wont bore a 400 over .040 total for a street engine. race engines sure, just run it till it cracks but not a street engine.
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Old 04-12-2005, 06:44 AM   #3 (permalink)
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Is it really in need of an overbore or just rehoning? Mine is .040 over & I don't have any issues with that, but I don't think I'd wanna go .060 if I could avoid it.

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Old 04-12-2005, 07:26 AM   #4 (permalink)
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I'm told bore deflection becomes an issue beyond .030". The shop I worked at wouldn't even consider building one if the block didn't clean up at .030".
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Old 04-12-2005, 12:05 PM   #5 (permalink)
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Quote:
Originally Posted by u2slow
I'm told bore deflection becomes an issue beyond .030". The shop I worked at wouldn't even consider building one if the block didn't clean up at .030".

This might be true but most 400's i've seen that could go .040 made it ok. We have had some trouble with cracking the blocks when we bore them though. we've also had blocks crack between the head bolt holes and steam holes.
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Old 04-12-2005, 05:54 PM   #6 (permalink)
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What about just sleaving the block back to factory specs? Any drawbacks to sleaving a 400?
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Old 04-12-2005, 06:39 PM   #7 (permalink)
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sure you can sleeve a 400. where abouts are you located, I know a shop in redding that just finished sleeving a 400 for a buddy of mine. came out bitchin.
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Old 04-12-2005, 07:03 PM   #8 (permalink)
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Thanks guys. I guess I will see if they can sleeve the block around here and how much it costs. I may have found a source for a couple of other blocks that if they are untouched I will go for first. These 400s seem to be quite a challenge to locate around here.

Jay

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Old 04-12-2005, 07:18 PM   #9 (permalink)
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I dont get it, i know the cylinders are siamesed on a 400 but how the hell do they get small block 454's and bigger from a 350? is it all stroke? and you just bore to the very maximum and then just stroke it from there? not much of a small block guy i guess, and if you sleeve one you would have to bore it to the maximum then push the sleeve in and you are right back to stock bore, what good did that do?

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Old 04-12-2005, 07:49 PM   #10 (permalink)
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I'd like to hear the answer on sleeving a siamese-bore block.

I don't think its possible. I thought you had to grossly overbore first, sleeve it, and then bore the sleeve to the desired size.

Another trick to stroking is offset grind the rod journals for a rod with a smaller big end. IIRC, early SBC rods get you .010" more stroke this way... I think its a certain Mopar rod that have an even smaller journal. GMPP has SBC blocks with a raised cam so you can swing a bigger, custom crank in there.
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Old 04-12-2005, 11:22 PM   #11 (permalink)
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I've seen SBC's up to 482 inches. its scary.. its done with custom tall deck blocks from people like dart (the little M tall deck) These blocks come with a 4.125 (stock) bore. if you take them to 4.185 (.060 over) and put a 4.125 crank in them you get 453.9" They also make SBC blocks that can safely be bored to 4.25 (stock 454 bore) then you put a 4" crank in them (stock 454) and you basically have a small block 454 with the same bore/stroke as a big block 454.

as for siamese bores being sleeved, any aftermarket alluminum block you buy, (like a donavan big block chevy) is siameesed bores and they all use ductile iron sleeves. when the sleeves are wasted you just re-sleeve and start over. as long as the cylinder case is true you just keep re-sleeving. you do the same with a 400 block. you bore the piss out of it and install new sleeves. My buddy has a fully sleeved 400 in his race car right now. good to go. I can call my buddy and get the 400 sleeve part numbers if you want.
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Old 04-12-2005, 11:36 PM   #12 (permalink)
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http://www.hotrod.com/techarticles/e...113_0309_test/

There is a quick article on a 454 sbc of the 4.25 bore 4" stroke flavor.
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