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Old 07-18-2010, 09:55 PM   #1
jim loveland
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Default how much boost can a stock sbc take?

have a stock 350 chevy i put in my truck my other motor went way south.I have 2 small turbos blow thru set what is safe boost and timing on 93 octane.
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Old 07-18-2010, 09:58 PM   #2
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Default Re: how much boost can a stock sbc take?

you dont go by how much boost an engine can take. you put 2 91mm on there or 2 67mm big differance
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Old 07-18-2010, 10:12 PM   #3
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Default Re: how much boost can a stock sbc take?

2-68MM
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Old 07-18-2010, 10:17 PM   #4
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Default Re: how much boost can a stock sbc take?

You're probably gonna get some mixed answers on this. I would run no more than 8psi and keep it super conservative on the tune.
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Old 07-18-2010, 10:29 PM   #5
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Default Re: how much boost can a stock sbc take?

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Originally Posted by whtcoupe View Post
You're probably gonna get some mixed answers on this. I would run no more than 8psi and keep it super conservative on the tune.
I have really had some shitty luck with my motors!My last motor I found out why you shouldnt use keith black pistons. I had one come apart take out the cylinder big hole and i thought i was consevitive at 12psi. I need to buy a good block for my next build .Just put this in so i have somting to drive.
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Old 07-18-2010, 10:57 PM   #6
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Default Re: how much boost can a stock sbc take?

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Originally Posted by jim loveland View Post
2-68MM

had twin 61mm, @ 30 psi on methanol..
010 gm block
very ,very high maintance...if you know what i mean
parting line on main caps looks like the rock mountains...
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Old 07-18-2010, 11:02 PM   #7
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Default Re: how much boost can a stock sbc take?

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Originally Posted by whtcoupe View Post
You're probably gonna get some mixed answers on this. I would run no more than 8psi and keep it super conservative on the tune.
I have run 24 lbs.+ of boost on a factory LT1 4 bolt /studded with a YSi Vortech.Never had a problem .New engine is 4 bolt splayed/ studded / filled with twin 76 mm turbos looking to find the limits.The Chevrolet smallblock isn't a Ford 302 that cracks at 500 rwhp.
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Old 07-19-2010, 07:21 AM   #8
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Default Re: how much boost can a stock sbc take?

It not really how much boost but, how much hp and Tq.
Depends 750-850 hp but it depends on the prep, parts, fuel, etc..........
It is always a good idea to upgrade to Dart block. How far do you trust a $50.00 junkyard block.
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Old 07-19-2010, 07:25 AM   #9
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Default Re: how much boost can a stock sbc take?

my 010 block no fill. splayed caps. .030 over. i run 15 lbs with a 88mm. and run 8.90s at 150 in a 3500lbs s10 long bed street truck.
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Old 07-19-2010, 07:27 AM   #10
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Default Re: how much boost can a stock sbc take?

im looking to turn it up some. maybe 18 to 20 lbs.
it goes 10.3 at 124 on 9lbs, and 8.90s 9.000 on 15.
hope to go 8.50s - 60s with 20
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My 82 s10 lb 8.89 at 152.78 on pump E85. 15lbs boost 357"sbc 8.4:1
89 s10 blazer 9.90 nitrous 335" sbc 12.4:1 e85 homemade 750 225 shot
2001 z28 camaro hooker lt ofy flowmaster slp lid bellows. Awaiting the turbo kit I built for it that keeps ac and stock rad location.
2001 tahoe bone stock
1997 gmc yukon 2.5" lift 285/75 tires trailer puller.
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Old 07-19-2010, 10:55 AM   #11
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Default Re: how much boost can a stock sbc take?

Quote:
Originally Posted by jim loveland View Post
have a stock 350 chevy i put in my truck my other motor went way south.I have 2 small turbos blow thru set what is safe boost and timing on 93 octane.
in my many beatings of SBC chevys in my life I have shoved 400hp shots of nitrous and turned them 7000 +rpm I have also shoved huge heads and camshafts into stock short blocks and turned them rediculous rpm. The only thin I haven't done it turbocharger a stock SBC.

that siad. the blocks would give up the ghost around 700-800hp.
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Old 07-19-2010, 12:19 PM   #12
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Default Re: how much boost can a stock sbc take?

ok didnt really explain what im doing im talking totally bone stock 350 its a jasper crate motor i bought on craigslist i fliped it over checked acouple of bearings and went with it. Runs great .Do you think this would survive with 3 to 5 lbs of boost? i have my timing locked out at 36 degrees and taking a degree out per lb of boost
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Old 07-19-2010, 12:25 PM   #13
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Default Re: how much boost can a stock sbc take?

yes all day long. but watch the cast pistons.
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My 82 s10 lb 8.89 at 152.78 on pump E85. 15lbs boost 357"sbc 8.4:1
89 s10 blazer 9.90 nitrous 335" sbc 12.4:1 e85 homemade 750 225 shot
2001 z28 camaro hooker lt ofy flowmaster slp lid bellows. Awaiting the turbo kit I built for it that keeps ac and stock rad location.
2001 tahoe bone stock
1997 gmc yukon 2.5" lift 285/75 tires trailer puller.
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Old 07-19-2010, 12:35 PM   #14
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Default Re: how much boost can a stock sbc take?

thanks you going out to thompson on saturday i have a s10 too whould like to check it out.
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Old 07-19-2010, 02:26 PM   #15
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Default Re: how much boost can a stock sbc take?

Quote:
Originally Posted by Z8's View Post
I have run 24 lbs.+ of boost on a factory LT1 4 bolt /studded with a YSi Vortech.Never had a problem .New engine is 4 bolt splayed/ studded / filled with twin 76 mm turbos looking to find the limits.The Chevrolet smallblock isn't a Ford 302 that cracks at 500 rwhp.
We're not talking about what the BLOCK can handle, but what the components inside can safely handle. Since the stock parts in that crate motor are powdered, I say keep the boost low.
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