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Old 07-19-2010, 05:06 PM   #16
Collinsautomotive
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Default Re: how much boost can a stock sbc take?

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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
depend on the heads. If it is iron headed I'd take 1.75 degree per pound or maybe 2 per psi. that siad I have seen stock SBC engines take 15 psi without to much complaint. I have not personally done this. So your results may vary.
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Old 07-19-2010, 05:12 PM   #17
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Default Re: how much boost can a stock sbc take?

KEEP IN MIND MY SHIT WAS OFF ALL THE WAY THROUGH....My HP output was only 550, but I slammed 22 lbs of boost to get there. The block showed no signs of wear. I have scrapped the whole motor at this point and I am starting over
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Old 07-19-2010, 10:23 PM   #18
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Default Re: how much boost can a stock sbc take?

I was thinking about my post, I may have an answer to your original question LOL.

I WAS WRONG IN MY ORIGINAL POST ( i think i screwed the pooch on dyno not at the track)

After thinking about my post MAYBE that 22 lbs of boost did hurt it. 5 passes later my oil was silver in color and loses 38 pounds of oil pressure once it gets hot. That dyno session was the only time it saw 22 pounds of boost was on that dyno run. It only got to 550 in HP this motor was shit from day one
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Old 07-20-2010, 08:55 AM   #19
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Default Re: how much boost can a stock sbc take?

my friend if you need 22lbs to make 550. u need a larger turbo very bad. thats insane boost for a v8 to only make 550.
the heat alone had to be killing it.
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Old 07-20-2010, 02:20 PM   #20
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Default Re: how much boost can a stock sbc take?

all depends on how the car us tuned and how much tq ur rods and rod bolts can handle.
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Old 07-20-2010, 10:11 PM   #21
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Default Re: how much boost can a stock sbc take?

It does have iron heads on it.I want to take it to the track and see how fast it will go i still dont have a cage in it.Not sure how fast it will be?
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Old 07-21-2010, 10:14 AM   #22
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Default Re: how much boost can a stock sbc take?

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my friend if you need 22lbs to make 550. u need a larger turbo very bad. thats insane boost for a v8 to only make 550.
the heat alone had to be killing it.
Well I have an s480 w 96 mm wheel and 132 ar. This motor upon arrival was NOTHING it was supposed to be. I am sure the motor and cam, and heads were the reason this thing wasnt working. I am not even trying to fix it. I am starting over.
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Old 07-21-2010, 10:51 AM   #23
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Default Re: how much boost can a stock sbc take?

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Well I have an s480 w 96 mm wheel and 132 ar. This motor upon arrival was NOTHING it was supposed to be. I am sure the motor and cam, and heads were the reason this thing wasnt working. I am not even trying to fix it. I am starting over.
Those numbers would make sense if it has factory TBI cam in it.
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Old 07-21-2010, 11:37 AM   #24
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Default Re: how much boost can a stock sbc take?

It was a custom ground lunati cam solid roller (when I got the motor is saw what they had and threw it out) LOL. Also when I got on trans brake it too 9 to 11 seconds to get 7 pounds boost. hellI even put accel gen 7 on it, and had ti to 2 different tuners.

This thing was a disaster
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Old 07-21-2010, 11:55 AM   #25
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Default Re: how much boost can a stock sbc take?

Yikes. What heads and how much timing was in it?
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Old 07-21-2010, 12:35 PM   #26
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Default Re: how much boost can a stock sbc take?

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Yikes. What heads and how much timing was in it?
Actually I dont remeber on the timing, when this piece of shit showed up it had procomp heads. I as fla stuck all the way across the board on this piece of shit
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Old 07-21-2010, 10:22 PM   #27
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Default Re: how much boost can a stock sbc take?

i would say. good luck with the build will deff run better this time arround.
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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.
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Old 07-21-2010, 10:42 PM   #28
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Default Re: how much boost can a stock sbc take?

you can beat the chit out them if the block prep and tune is right. i have seen them in the 1100-1200hp range with a turbo. 900-1000 on nos.
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Old 07-21-2010, 11:16 PM   #29
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Default Re: how much boost can a stock sbc take?

OK guys, can you answer this: my Brother has spun #8 rod bearing on 2 sbc's. 5lbs boost fromWeiand blower street driven. The 290 hp crate motor was T&T 15-20 passes and maybe 1500 miles. The 305 lasted about 200 miles, never made it to the strip.
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Old 07-21-2010, 11:41 PM   #30
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Default Re: how much boost can a stock sbc take?

cylinder head design on chevy's suck for boosted applications. Two exhaust valves very close to each other....not good for longevity
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