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Old 12-11-2007, 06:17 PM
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how much hp could a 2 bolt main block handle

how much hp could a 2 bolt main block handle casting # is 3970010

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Old 12-11-2007, 06:20 PM
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it's going to depend on who you ask, & whats it going to be used for.
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Old 12-11-2007, 06:24 PM
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Quote:
Originally Posted by 406 ss monte
it's going to depend on who you ask, & whats it going to be used for.
it is going to be a daily driver but i want to get the most power i can but still have decent gas mileage
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Old 12-11-2007, 07:36 PM
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depends

Depends on who you ask like stated. If you use studs I have seen many 500hp. I personally have a 2 bolt with 420 motor and have sprayed it with 100hp nitrous shot for 14 passes and drove it 60mi home at 3400 rpm. It has out lased a trans and rearend. If you are looking at 350hp it will live forever and that is without studs.
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Old 12-11-2007, 08:09 PM
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Quote:
Originally Posted by tomthecomic
Depends on who you ask like stated. If you use studs I have seen many 500hp. I personally have a 2 bolt with 420 motor and have sprayed it with 100hp nitrous shot for 14 passes and drove it 60mi home at 3400 rpm. It has out lased a trans and rearend. If you are looking at 350hp it will live forever and that is without studs.
what do you guys think is the best hp that i can make on a daily driver car and still have decent gas milleage
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Old 12-11-2007, 08:20 PM
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All 327's were 2- bolt blocks. Factory high HP was 375. I ran a .060 over (336) with t-ram, 12.5cr, Z-60 Isky cam, 4 speed and 4:88 gears...never ever broke it.
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Old 12-11-2007, 09:44 PM
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Quote:
Originally Posted by 1930u
All 327's were 2- bolt blocks. Factory high HP was 375. I ran a .060 over (336) with t-ram, 12.5cr, Z-60 Isky cam, 4 speed and 4:88 gears...never ever broke it.
327 only had a 3.250 stroke not 3.480 which makes quite a differance in side loading the caps. And the smaller housing bore makes for a stronger cap as well.

Here are some good links to go over.

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

http://www.chevelles.com/forums/showthread.php?t=38173
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Old 12-13-2007, 10:21 AM
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how much hp could a 2 bolt main block handle

do you guys think that a 2 bolt main block can handle up to 500hp with out a problem on the caps
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Old 12-13-2007, 10:30 AM
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Quote:
Originally Posted by jokes310
do you guys think that a 2 bolt main block can handle up to 500hp with out a problem on the caps
If a 2 bolt could handle 500 horse safely they would have never made a 4 bolt block!!!!

We build a lot of 500 horse circle track engines and we would never try that as we have seen what happens when guys try this. And I talk to Kenny from http://pro-gram.com/ about main caps and stud girdles and we seem to be on the same page.
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Old 12-13-2007, 11:32 AM
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oem crankshaft

how much is the hp limit for the stock cast steel crankshaft that come in the chevy 350 engine
casting #3970010
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Old 12-13-2007, 11:49 AM
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Quote:
Originally Posted by jokes310
how much hp could a 2 bolt main block handle casting # is 3970010
Get ready for the because most everyone has a different opinion.

The 010 block is a decent one ... if everything is OK ... core shift is a big factor. LOOK at the camshaft hole in the front of the block. IF the camshaft is in the center of the raised casting spot ... that is a good indication. Proper machining and bearing clearances also play a large part in a engine living @ the higher RPMS required to make a lot of horsepower in a SBC.

IF you have any doubts about your block handling horsepower ... after seeing your casting has not shifted you can have the block machined for splayed 4 bolt mains ... and then it will be BETTER prepared to handle some serious horsepower and even a shot of NOS ...

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Old 12-13-2007, 12:03 PM
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Quote:
Originally Posted by Deuce
Get ready for the because most everyone has a different opinion.

The 010 block is a decent one ... if everything is OK ... core shift is a big factor. LOOK at the camshaft hole in the front of the block. IF the camshaft is in the center of the raised casting spot ... that is a good indication. Proper machining and bearing clearances also play a large part in a engine living @ the higher RPMS required to make a lot of horsepower in a SBC.

IF you have any doubts about your block handling horsepower ... after seeing your casting has not shifted you can have the block machined for splayed 4 bolt mains ... and then it will be BETTER prepared to handle some serious horsepower and even a shot of NOS ...

Unless you sonic test blocks coreshift does not mean a thing as we have some blocks in the shop with perfect coreshift but cylinder wall thickness is junk and we have some blocks with bad coreshift and the cylinder wall thickness is fine.

If I could just go by coreshift I could have saved 1500.00 dollars on a soinc tester.
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Old 12-13-2007, 12:05 PM
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I know this is going to raise a huge BS flag, but it really is quite possible- maybe not smart though. If you go with forced induction and keep your redline below 6000 RPM 700 fwhp (that's fly wheel, not front wheel) is possible in a stock 2 bolt block as long as you have all detonation and harmonics controled- which is damn near impossible on the street at 700 hp.

THe cast cranks have taken 500 hp for a while, but you may have a "bad" casting and it may break.

Most pricey short block components are not necesary but they provide a great peace of mind.

hell cast pistons can take 550hp... the question becomes for how long, and how good of an engine builder are you?
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Old 12-13-2007, 12:07 PM
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Quote:
Originally Posted by jokes310
how much is the hp limit for the stock cast steel crankshaft that come in the chevy 350 engine
casting #3970010
Why not try for a nice 350 streetable hp and be done with it.........In a light car, that will give you all the thrills you should need. All your buddies are lying to you about what they have anyways, so you will probably still have more than them..........................
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Old 12-13-2007, 05:41 PM
How fast is fast enough?
 
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nowadays 350 hp is not that much, hell back in the '70s it wasn't that much. I would set my sights on 450- which is quite possible on the street, even with Vortec heads. I would use AFR's if you can afford it, get a good solid or roller cam, a PRM AirGap, headders and MSD ignition. YOu can use a stock crank if you want, but keep the RPM's down and go easy on the timing advance. I would use hypers if you have to, but forged pistons are best. ARP bolts to hold it all together and you're good to go.

You can make 350 hp on the street all with factory parts from the '70s... I think we can do a little better than that.

BUT AS NOTED- DO NOT GET CARRIED AWAY.
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