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Old 07-28-2008, 03:02 PM
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Power guesstimate?

Just curious what sorta power you guys think my SBC will make with the following mods...

355cid
Edelbrock 600cfm carb
Edelbrock Performer RPM intake
HEI ignition
Comp XE274 cam (230/236, .490/.490)
Holley aluminum heads (184cc runners, 2.02" in., 1.60" ex.)
Scorpion roller rockers (1.5:1)
10.3:1 CR

Thanks.

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Old 07-28-2008, 03:26 PM
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Umm, v8hed, you may want to mention the displacement of your "SBC."
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Old 07-28-2008, 03:28 PM
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Quote:
Originally Posted by XNTRCI-T
Umm, v8hed, you may want to mention the displacement of your "SBC."
Oops, sorry... it's a 355.
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Old 07-28-2008, 07:25 PM
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OK, just to keep this thread alive, I'll venture a guess...

One horsepower per cubic inch... 355 hp and maybe 300 torque.
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Old 07-29-2008, 03:34 AM
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Quote:
Originally Posted by XNTRCI-T
OK, just to keep this thread alive, I'll venture a guess...

One horsepower per cubic inch... 355 hp and maybe 300 torque.
Why so low? Edelbrock quote 420hp for their Performer RPM crate engine. The Holley heads flow better than the Performer RPMs and the XE274 cam is a better cam than the Edelbrock. Also, my CR is higher.
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Old 07-29-2008, 05:33 AM
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Dyno it and find out.
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Old 07-29-2008, 05:35 AM
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Quote:
Originally Posted by RippinRon
Dyno it and find out.
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Old 07-29-2008, 05:36 AM
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V8Hed check out this Program from Comp Cams called CamQuest 6. It's a free download @20MB similar to DeskTop Dyno with less features. It'll get you a close HP/TQ level.
http://compcams.com/camquest/default.asp
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Old 07-29-2008, 07:37 AM
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Quote:
Originally Posted by v8hed
Why so low?
I'm no engine expert, so don't take my guess too seriously. Like I said, I was mainly trying to keep the thread going. I figured someone would take me on and get a good debate going.
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Old 07-29-2008, 11:29 AM
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Quote:
Originally Posted by SSedan64
V8Hed check out this Program from Comp Cams called CamQuest 6. It's a free download @20MB similar to DeskTop Dyno with less features. It'll get you a close HP/TQ level.
http://compcams.com/camquest/default.asp
Thanks. According to that, I should be at around 415-450hp (depending on intake flow).
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Old 07-29-2008, 06:26 PM
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A lot of people will call that a 400 hp engine. Bragging to your friends it might even be 450. In real life, probably an honest 350-375.

It'll be a great engine, but unless people have a dyno slip to prove it, my experience is that they always overestimate.

dh
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Old 07-29-2008, 10:16 PM
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According to desktop dyno 2003 its pushing 400 horse at 5500 and 422 foot pounds at 4500.
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Old 07-30-2008, 01:52 AM
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Quote:
Originally Posted by dh79
A lot of people will call that a 400 hp engine. Bragging to your friends it might even be 450. In real life, probably an honest 350-375.

It'll be a great engine, but unless people have a dyno slip to prove it, my experience is that they always overestimate.

dh
Couldn't agree more and I agree totally with your estimate of an honest 350-375hp. I probably will never bother dynoing it as I don't really see much point... the numbers are pretty meaningless. Bragging to my friends, it will be a 400-450hp engine, haha. Hell, why not? Car manufacturers are often guilty of 'exaggerating' outputs!
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Old 07-30-2008, 01:54 AM
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Quote:
Originally Posted by jake_arcticcat
According to desktop dyno 2003 its pushing 400 horse at 5500 and 422 foot pounds at 4500.
Interesting... thanks.
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Old 07-30-2008, 07:44 AM
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Assuming the engine is machined and assembled properly and tuned right then 420hp/400ftlbs would be my estimate.

nice combo!

what gear, stall, weight of car???

a little 100 hp shot of N02 would be a nice addition at the track.
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