400 sbc 509 casting - Chevy Nova Forum
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Old 12th-January-2011, 07:02 PM   #1
LonnieC
 
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Question 400 sbc 509 casting

I am rebuilding a 434 short block and fear that my block may have been a bit to stressed to re-use and i am trying to round up a new block but is has been a hard search so far! Does anyone on here know any shops in or near Utah that would have a standard bore block? Or does anyone know what year and model truck came with them? I know is 73ish to 76ish but im not exactly sure what models, i have heard it was mostly one tons...?
Any good info will help
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Old 12th-January-2011, 07:19 PM   #2
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Honestly you would be better off buying a new block. What are your intened use of your 434? Street? Strip/street? Or just Track?
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Old 12th-January-2011, 07:29 PM   #3
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what

makes u think the block is toast ?,, decks cracked ?
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Old 12th-January-2011, 08:18 PM   #4
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Its going to be a weekend cruiser... I not aiming to get all that extreme with it... looking for more torque than anything. The reason i am looking for a new block is every steam hole has cracks running to them and i also know the guy i bought the block from and know how much stress was put on the block.
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Old 12th-January-2011, 08:42 PM   #5
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The cracks from the steam holes to the head bolt holes is common on an engine that's been overheated. I've put together two street 400's with cracks like that and never had any problems, deck the block and if you use head studs I bet you won't have any problems. The cracks won't migrate.
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Old 12th-January-2011, 09:13 PM   #6
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Do you feel that there is a need to worry about the fact that the engine was set up with a comp. ratio of 13.5:1 and raced for a season?
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Old 12th-January-2011, 09:28 PM   #7
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Quote:
Originally Posted by LonnieC View Post
Do you feel that there is a need to worry about the fact that the engine was set up with a comp. ratio of 13.5:1 and raced for a season?
if you want full proof go get a dart block no more worries
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Old 12th-January-2011, 09:31 PM   #8
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If you're building a street motor-400hp or less, and the mains are straight, bores are good, and you deck the block-I really don't think you'll have any problems. I never used head studs on the ones I assembled and never had any problems-I have heard that using studs can help take some stress off of the threads though so I'd bet they would help. How much compression are you planning to run-11:1?
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Old 12th-January-2011, 09:50 PM   #9
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http://dallas.craigslist.org/dal/pts/2102798293.html too bad your not closer
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Old 12th-January-2011, 10:41 PM   #10
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if you want full proof go get a dart block no more worries
I would love to go with a new dart block and that still might be what i do but if i do that will most definitely slow my top end purchasing down by quite a bit...

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Originally Posted by Baddbob View Post
If you're building a street motor-400hp or less, and the mains are straight, bores are good, and you deck the block-I really don't think you'll have any problems. I never used head studs on the ones I assembled and never had any problems-I have heard that using studs can help take some stress off of the threads though so I'd bet they would help. How much compression are you planning to run-11:1?
And yes everything with my old block is straight and already has Howards Cam splayed caps. I just have a lot of money in all the internals and hate the not knowing feeling i get with this block...
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Old 12th-January-2011, 10:59 PM   #11
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One word for you: Dart SHP block

http://www.jegs.com/i/Dart/301/31161211/10002/-1?CT=999

By the time you buy and machine an old block you are most of the way there.
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Old 12th-January-2011, 11:00 PM   #12
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I would love to go with a new dart block and that still might be what i do but if i do that will most definitely slow my top end purchasing down by quite a bit...


And yes everything with my old block is straight and already has Howards Cam splayed caps. I just have a lot of money in all the internals and hate the not knowing feeling i get with this block...
I know how ya feel when it comes to this block. I had the same decision to deal with when I had to chose between my old block and the one I chose. In the end I bite the bullet and bought the new one. It may take u a little more time and money but u will be glad u did.
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Old 12th-January-2011, 11:08 PM   #13
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400 blocks are becoming scarcer all the time and the ones still around aren't getting any newer. The odds of finding one with in driving distance are slim. You can probably find one nationwide, but the shipping costs will be significant expense and you won't really know if it's a viable core until you get it.
It's false economy to think you are saving money unless you get very very lucky.. There are so many advantages with the new blocks, I wouldn't even consider a used 400 block anymore.
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Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol.
.
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Old 12th-January-2011, 11:12 PM   #14
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Have any of you used the bowtie sportsman block? I have looked into them as well just because i have a phone a friend connection that may be able to get me one at cost.
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Old 12th-January-2011, 11:25 PM   #15
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There are 400 blocks here in Bend Oregon on craigslist all the time.
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