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Old 09-16-2010, 08:05 AM
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nead a HP answer

I have 350 bored .30 over flat top four valve relief pistons .420/.420 lift comp cam block surfaced .010 highrise marine 2 barrell intake 500 holley and headers runing 882 heads looking to put a set of 441 heads on motor. Runing 4.10 gear in rear turning about 6000 to 6200 RPM .What kind of HP am i looking at want to now if there will be a gain or lose from 882s to 441s.

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Old 09-16-2010, 08:14 AM
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with the lack of details this is just a wild guess, but I'd say about 250.
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Old 09-16-2010, 09:03 AM
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here are a bunch of small block setups on the dyno.

http://www.ryanscarpage.50megs.com
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Old 09-16-2010, 09:57 AM
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Quote:
Originally Posted by tdawg
I have 350 bored .30 over flat top four valve relief pistons .420/.420 lift comp cam block surfaced .010 highrise marine 2 barrell intake 500 holley and headers runing 882 heads looking to put a set of 441 heads on motor. Runing 4.10 gear in rear turning about 6000 to 6200 RPM .What kind of HP am i looking at want to now if there will be a gain or lose from 882s to 441s.
You can get a good estimate of the rear wheel HP by knowing the weight w/driver and what the top speed is after running a measured quarter mile.
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Old 09-16-2010, 12:07 PM
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Sorry but this is not a drag car it is a pure stock dirt track car just trying to get some good HP and torque coming of the corners and get on down the straight's not that bad now just like to find out for sure the 441s will give me some more.We can't run closed chamber ,vortec,or any double humps.So it is hard to find a head that gives compression and you can't cut the 882s that much.Just trying to find a good open chamber head that is not crack prone.I was told the 441 and 487 were good just don't now what kind of HP I can gain. Just want more info on them before I spend some money.

Last edited by tdawg; 09-16-2010 at 12:12 PM.
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Old 09-16-2010, 12:26 PM
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Cobalt is right, take it down the strip. That is the most accurate way to know the power produced at the back wheels without a real dynometer se$$ion, combine the 1/4 mile time with the weight. It is cheaper than a real dyno. Even if it is not a drag car. You could derive the hp of a honda civic or a minivan or a school bus with that method.

The desktop dyno sim will give you a ball park figure if you know exactly how much your heads can flow and exactly what cam you run and what compression and exhaust etc. Some of that can be estimated from port size, some not. Tuned headers can make a large difference when combined with the right rpm and the right cam. One cool thing is once you get your motor all in there reasonably accurately you can then swap in different heads, exhaust, cam, manifold you name it to optimize what you want, it even offers suggestions.

Last edited by Dirty Biker; 09-16-2010 at 12:43 PM.
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Old 09-16-2010, 12:29 PM
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487X is your best bet, but they are hard to find.
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