I heard a 406 is has alot better than 400 how so? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-17-2002, 07:26 PM
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Post I heard a 406 is has alot better than 400 how so?

How is it so that a 406 with similar bore and stroke to 400 can get more power? I do realize it has a slightly higher displacment etc etc but I was told that it would get a ton of power and a 400 done similarly wouldn't come close. I dunno I kinda think my friend is an idiot but whatever

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Old 10-17-2002, 10:25 PM
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I'll assume you are speaking of a 400 small block chevy. A "406" as they are popularly called, is merely a 400 that has been bored .030". That's not much difference, about 5 horsepower, if it makes close to 1 horse/cubic inch. Now, 5 horsepower is better, but you won't feel it in the seat of your pants.
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Old 10-17-2002, 10:30 PM
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I thought a 406 while .030 over also inclued 5.7" rods.
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Old 10-18-2002, 09:24 AM
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THE ROD LENGTH DOES NOT AFFECT DISPLACEMENT, THE STROKE, AND BORE SIZE DICTATES DISPLACEMENT. YOU CAN BUILD A 406 WITH EITHER THE SHORTER 400 RODS OR THE LONGER 5.7, 350 TYPE ROD.
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Old 10-18-2002, 12:56 PM
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I have to say your friend doesnt know sh## from apple butter. I always chuckle at guys who say they have a "bored out" whatever and how much more power it has. The only reason it might have more power is because it is not completly worn out like it was before it was rebuilt.

400 sbc is actually better not bored due to the cylinder wall thickness. It will be stronger.

Chris
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Old 10-18-2002, 04:25 PM
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Yeah well that is my opinion too. THen again this is the same guy who thinks that the chances of me finding a 400 block in a wreckers yard is next to impossible and if I do find one it will be cracked. Basically he has to have the best all the time but whatever all the power to him I guess. I just prove him wrong when I feel the need.
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Old 10-18-2002, 04:51 PM
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your buddy may be wrong on the 400-406 issue but he is correct on the finding a good block, in this area (and they were built here!) good 400 blocks especially 2-bolts are going for premium prices. hell even 350's are getting hard to find anymore, 400 blocks crack around the head bolt holes and in the inner block area towards the rear between the lifter bore area and the deck , the latter problem can be pinned and fixed . good luck and keep the overbore to a minimum,run the longest rod you can afford.
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Old 10-18-2002, 07:10 PM
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Yeah I don't think finding a block is gunna be too hard. There are tons of chev engines around here. I live in central alberta and I have found plenty of blocks for sale in papers and the bargain finder for under 400 bucks cdn (so what is that now 5 american?) yeah so I don't think it should be too hard. Also there are quite a few good wreckers yards around here (not picked through) so since I have the casting numbers it will just be a matter of searching for one with no visible cracks and not alot of wear.
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