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Old 02-16-2004, 11:24 AM
HJCHEVY400's Avatar
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Thumbs up Horsepower Estimate For A Smallblock 350

Hi All!

I have a 350 built to these specs:

2-bolt block
.040 overbore
stock rods
flat top pistons
9.2:1 comp ratio
307 heads, very mild port/polish
2.02 / 1.6 valves
Cam dynamics .465 int .481 exh , 112 lobe sep,
224 int, 234 exh dur @ .050

Holley 650DP List 6310
Holley Street Performer Manifold, Match Ported to Heads
Accel Twin Point Distributor
MSD Blaster 3 Coil
Top Gun 10mm Ign Leads
Stock Sump, Oil Pump
Pacemaker Headers, 1 5/8" into 3" collectors
Total Timing Adv : 34 deg


If anyone would have a horsepower estimate, I would be glad to know, and it would be very much appreciated, as I am a novice to engine building.

Thankyou,

From Tom in Australia

... and sorry guys, it has stock rockers, pushrods,
7/16 screw in studs, and guideplates,

thanks again

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Last edited by HJCHEVY400; 02-16-2004 at 11:24 AM.
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Old 02-16-2004, 11:30 AM
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I would say 300 to 350 at most.

Vince
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Old 02-16-2004, 12:00 PM
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Thanks very much Vince. I thought about the same. I tried to figure it out based on performance in a 3400lb car, with a turbo400 trans, 3.08 rear gearing, restrictive single 2 1/2 " exh.,
0 to 60mph = 6.1 sec.

thanks vince for your estimate
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Old 02-16-2004, 05:56 PM
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I ran your specs on Desktop Dyno and HP peaked 311 @4500 RPM and Torque was 410@ 3500. How do you figure your 0-60 times, 6 second 0-60 with little over 300 hp is very hard unless you have low gears and a good dialed in chassis.
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Old 02-16-2004, 05:59 PM
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is this an olds or a cheby?
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Old 02-16-2004, 07:23 PM
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I got you putting out 369hp at 5500rpm and 384lbft. of torque at 4500rpm. I used desktop dyno and those figures are considering if you have a hydraulic flat tappet cam/lifters.
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Old 02-17-2004, 06:55 AM
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can i see that?

anyone wanna burn me a copy of desktop dyno? i lost my copy.....
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Old 03-05-2004, 05:36 AM
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HP Estimate

GEEZ...........
I have a 355 SBC 4 bolt, 144 B&M Blower, Blower Pistons, Blower Cam, 882 large chamber heads, Headers, 700CFM Holley Double Pumper, MSD Coil / Ignition, 340hp@4500rpm w/ 9 lbs of boost. Although my heads are poor flowers, I can't see the HP you fellows are estimating on the 350 2 bolt. Take it to the track, put it on a wheel dyno (there's usually one there), to see what you're producing at the rear wheels.
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Old 03-05-2004, 07:08 AM
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wheel dyno at the track ? wow we dont have that here in the states, thats fancy. John
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Old 03-05-2004, 07:59 AM
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whats fancy about it ? ? ?
Go on a day when the track is sponsoring street shoot outs and you'll most likely find a wheel dyno there testing hp to the wheels. At least that's been my experience.
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Old 03-05-2004, 08:34 AM
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In my 20+ years of going to the track, I have yet to see a wheel dyno.
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Old 03-05-2004, 09:28 AM
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There's been one at the Greenfield Nova Scotia track couple years. The owner who brought it was inviting everyone who had registered to race put their cars on it. I find it hard to believe that no other track in N. America has ever had one show up. Go figure.......................
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Old 03-06-2004, 06:17 PM
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There's usually one when I go to Cecil County Dragway on grudge night, $75 to run your car on the dyno.


Mike
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Old 03-07-2004, 06:10 AM
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I DIDN'T THINK I WAS LOSING IT.............
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Old 03-09-2006, 10:44 PM
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Hmmm$$$$$$$$$! Im getting an idea here!$$$$$$$$$$$$$$$$$ Maybe I should try an buy one of them there machines,and get gpoing to all the events around.
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If I had the money,Id do that!
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