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Old 12-23-2007, 12:40 AM
383 383 is offline
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Block

Hi
1 how much hp and rpm could a GM 4bolt take?
2 How much if it is half filled with block filler?

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Old 12-23-2007, 01:02 AM
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The better question is how much are you looking to make? And what size engine are you planning on building? I'll take a guess and go with a 383?
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Old 12-23-2007, 09:43 AM
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I'm moving this to the engine forum, I can't make heads or tails out of the question.
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Old 12-23-2007, 01:59 PM
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Quote:
Originally Posted by 383
Hi
1 how much hp and rpm could a GM 4bolt take?
2 How much if it is half filled with block filler?
I depends what caps you are talking about 2482 caps we use them up to 500 horse stock caps around 425 horse.

The first thing to do is have the cylinders sonic tested to make sure you have a good peice before you start.

Here are a link to look over
http://www.chevelles.com/forums/showthread.php?t=38173
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Old 12-24-2007, 05:55 AM
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Quote:
Hi
1 how much hp and rpm could a GM 4bolt take?
2 How much if it is half filled with block filler?
Ayuh,......

Is this a 327 Block,..??..??....
Or a 454 Block,..??.......

Or for that matter,.......
Is it even a Chevy Block,...... Olds,..?? Buick,..?? Cadilac,..??
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Old 12-24-2007, 07:02 AM
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I build engines for a hobbie

Ive built many 383 's proberly over 200 sbc engines I have one that has over 800 hp in my little hot rod. to answer your question the most honest answer i could give you is how much money do you have ? this is not to be a smart elic answer, however ive seen over 1000 hp sbc engines . Your money is the limit of hp and torque to the question you have.
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Old 12-24-2007, 09:21 AM
383 383 is offline
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Hi all,I mean a 350 sbc(stroked or not)
I always read about block problems,so I was wondering at which performance level should a aftermarket block be bought?
Is the factory 4bolt good for 500,600,700hp?
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Old 12-24-2007, 11:01 AM
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Quote:
Originally Posted by 383
Hi all,I mean a 350 sbc(stroked or not)
I always read about block problems,so I was wondering at which performance level should a aftermarket block be bought?
Is the factory 4bolt good for 500,600,700hp?
Again read this link.

http://www.chevelles.com/forums/showthread.php?t=38173
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Old 12-24-2007, 02:32 PM
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350 engines

The same applies. You can use aftermarket parts like mainbearing caps all kinds of things . The only problem i ever had was a 400 sbc one time the head bolt threads gave out on me. I have a 800 hp engine that ive ran for 2 yrs now that is a factory engine block .030 over no sleeves or any modifications besides the normal . I have about $17,000. invested in polishing ported Brodax heads. and some good pistons and camshaft. and crank. For a good runing street machine or street rod , or a street strip machine. a factory cast block is as good as they get. Gm has been making the casting for over 50 yrs for a good thing Why change a good thing. Merry Christmas Dale. If any questions call 615-641-6822 Nashville tn. We can talk for hrs . Thanks here is a pic of an engine i built almost 1000 hp factory block
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Old 12-24-2007, 02:54 PM
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Quote:
Originally Posted by dalegward
The same applies. You can use aftermarket parts like mainbearing caps all kinds of things . The only problem i ever had was a 400 sbc one time the head bolt threads gave out on me. I have a 800 hp engine that ive ran for 2 yrs now that is a factory engine block .030 over no sleeves or any modifications besides the normal . I have about $17,000. invested in polishing ported Brodax heads. and some good pistons and camshaft. and crank. For a good runing street machine or street rod , or a street strip machine. a factory cast block is as good as they get. Gm has been making the casting for over 50 yrs for a good thing Why change a good thing. Merry Christmas Dale. If any questions call 615-641-6822 Nashville tn. We can talk for hrs . Thanks here is a pic of an engine i built almost 1000 hp factory block
WOW we build a lot of circle track engines up to 600 horse anything after that would require a Dart or Bowtie block and the engine shops we machine blocks for and work with don't use them over 600 horse either.

If they were good over 600 horse that would save alot of people some money,
Dart rates there Nodular iron block at 900 horse and your saying a stock block is good for 1000 horse.

NOW THE BIG QUESTION HOW DEPENDABLE IS A STOCK BLOCK AT 1000 HORSE OVER A GOOD DART OR BOWTIE.


If a guy is dumping 17000 dollars in an engine I think he would want a better foundation then a stock block HMMMMMMM
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Old 12-24-2007, 03:08 PM
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Thanks for the help,I have a 4bolt and it should work for me.
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Old 12-24-2007, 03:15 PM
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Once again, how much are you looking to get from your engine?
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Old 12-24-2007, 04:45 PM
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I was hoping for 500hp,but would want to ad some nitrous later.
Do you think adding 150-200hp nitrous would wreck the block?
I have read that your a motor should be built for the hp it makes with nitrous.
500hp+200hp
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Old 12-24-2007, 07:16 PM
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Quote:
Originally Posted by 383
I was hoping for 500hp,but would want to ad some nitrous later.
Do you think adding 150-200hp nitrous would wreck the block?
I have read that your a motor should be built for the hp it makes with nitrous.
500hp+200hp
Hopefully your block has the 2482 caps on it as they are good for at least 500 horse and GM rates there blocks with these caps at 450 horse any thing over 500 horsewe go to splayed center caps and a billet front cap and strap the rear mains as we have seen what happens when you push the limits of stock grey cast caps.

Most of the engines we build are for circle track and for the street you maybe fine.

I have some pics of webbing of stock blocks blown apart and some pics of broken caps.

Look in the GM cataolog and see what they rate a block with stock caps at!!
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Old 12-24-2007, 07:20 PM
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On that stock block at least have it sonic tested before you start anything to make sure the cyinders are thick enough for that kind of HP as we find about 3 out of 10 blocks have good enough cylinders for that kind of HP and don't go by core shift!!
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