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Old 09-05-2008, 06:06 PM
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Max safe load on a 2bolt 350

Whats a safe hp range for a 2 bolt 350/383/385 with arp studs?

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Old 09-05-2008, 07:38 PM
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Factory rated 2 bolt mains are good for 500 horsepower. However I am unsure what it would be with studs.
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Old 09-05-2008, 09:06 PM
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take a 2 bolt and put the 4 bolt caps on it, and they will hold a LOT more htan 500
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Old 09-08-2008, 09:03 PM
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Quote:
Originally Posted by TASHAN
Whats a safe hp range for a 2 bolt 350/383/385 with arp studs?

The HP is not as much of a factor as the RPM. With a 350 you can safely turn higher RPM's than a 383 because of the longer stroke which creates higher pistons speeds and in turn higher G forces.
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Old 09-08-2008, 09:28 PM
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max safe load on a 2-bolt 350

I have heard some nightmare stories about using those splayed 4-bolt caps on an original 2-bolt block. Enough material is removed to use the 4-bolt caps and the block is actually weakened. I looked into this a while back and too many people had major problems. The shop that built my motor did not recommend it either and they were very confident that a properly built and balanced 2-bolt is very strong, over 500hp .
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Old 09-09-2008, 01:32 AM
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It's whatever cracks the block first.
There is no for certain power limit every 2 or 4 bolt block can go to.
These are all built differently (core shift) so it depends more on how centered your bores are than anything else.

That being said;
Most OEM engines can withstand 125-150% duty cycle with no ill effects. Just longevity issues.

That would put any well built 350 at a max perf. level of 450HP. Plenty angry of an engine for all but the most experienced builder.

Obviously the top of the scale limit will open up more possibilty for stress fissures (cracks) which are usually catastrophic in most cases.

Most engines in the 150% range are a real bear to drive on the street.
Volumetric Efficiency (normally aspirated) in excess of 130% is quite difficult to obtain even with the best parts available. But not impossible by any means.
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Old 09-09-2008, 04:22 PM
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We build alot of 500 horse engines and using a 2 bolt will not cut it, We have some 2 barrel circle track engines that are around 380 horse and I can tell you 2 bolt won't stand up to that.

Here are some llinks to look over.

GM rates there 2 bolt Bowtie block at only 375 horse and he did say SAFE

http://www.chevelles.com/forums/showthread.php?t=38173

http://ls1tech.com/forums/showthread.php?t=652566

http://www.nastyz28.com/forum/showth...731#post264731
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