could anybody take a wild guess at what horsepower i might be running?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-01-2003, 02:19 PM
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could anybody take a wild guess at what horsepower i might be running??

i was wondering if anybody could take a guess at what horsepower my motor might be pushing. it is a completely rebuilt 283 bored .30 over, '69 corvette heads with 194 valves and 64cc chambers, flat top pistons, edelbrock performer intake, edelbrock 600cfm 4-barrell carb, h.e.i. with hypertech coil and aurora wires, headers, 270 duration camshaft, k&n filter, double roller timing chain, true dual 2 1/4 exhaust with dynomax bullet mufflers to 2 1/2 inch tailpies,pete jackson gear drive, electric fan, and probably a few other little goodies im forgetting. i know a dyno is the only way to tell but what do you think a ballpark figure would be?? everybody always asks me how much horsepower it has and i cant even take a stab at it. thanks alot

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Old 12-01-2003, 02:37 PM
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My guess would be around 300

Really rough guess
if you've got a windows box check out desktop dyno its usually pretty good at dynoing on your computer
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Old 12-01-2003, 02:54 PM
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Probably around 300. A 350 with the same setup as yours plus a set of good heads put out 380hp and 400tq in Hot Rod, and the same setup in a different magazine put out 350hp with similar heads to yours (small valve GM "performance heads").

So yours could be 275-300hp, and the weak points would be the displacement and the heads, in my opinion.

Maybe someone with some first hand experience with a setup like yours will come along and help you out, but I figured this would tide you over.
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Old 12-01-2003, 03:00 PM
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yeah thats kinda the area i was thinking but i wasnt too sure. would an edlebrock performer RPM air gap which i understand is pretty much their best intake, make much of a difference over the regular performer or would i just be too much for this smaller engine? they also dont list the 600cfm carb in their list of recomendations for this intake so does this mean they wouldnt match up well or would it really matter very much? any other suggestions you have on how to gain a little more power is much appreciated, since we all know you can never have enough!
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Old 12-01-2003, 04:28 PM
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My money is on 245 hp to 275hp
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Old 12-01-2003, 05:25 PM
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An RPM manifold almost always makes more power than the Performer. The smallest engine I've seen them dynoed on was a 318, and it picked up 19hp/24tq with the RPM Airgap instead of the stock Thermoquad manifold, and only picked up 10/14 with the Performer. With a 1" open spacer added to the top of the RPM, it gained an additional 5hp/12tq!

The 600 is fine. Do you know if you have the "economy" one or the "performance" one? If you want to milk out more HP, I would recommend getting the carb dialed in, which is easier (in my opinion) if you switch to a Holley. You can also milk out power by getting the truck dyno tuned and having the timing curve dialed in.

If I were in your shoes, I would look for a better set of heads, and in the meantime slap a 200hp nitrous plate on it.

I would also consider a 350-400 when the 283 gets tired.
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Old 12-01-2003, 05:27 PM
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yea my 89 formula 350 comes with 240 hp stock and 340lb torque, and it is pretty nice, so you should be proud of whatever you make, it will blow away most of the stuff you will come across on the street!
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Old 12-01-2003, 05:49 PM
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i would have to agree with gayshark i would be surprised to see you pass 280
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Old 12-01-2003, 06:18 PM
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yeah im not sure if its the "Economy" or "performance" carb. its the edelbrock performer #1406 electric choke. is this the performance one??
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Old 12-01-2003, 06:53 PM
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That's the economy one. It's set up pretty mild.
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Old 12-01-2003, 07:05 PM
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I agree with Gay Shark......about 250 hp.
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Old 12-01-2003, 07:24 PM
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I just wanted to type in the words gay shark, so I agree with him too!
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Old 12-01-2003, 07:27 PM
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I just wanted to type in the words gay shark, so I agree with him too!
So did I, and it's more HP than Auto Patrs 427 vette.
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Old 12-01-2003, 08:00 PM
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ouch id hate to have the name auto part or have that 427 or id feel like this-->

the best way to figure out hp is to put your car in neutral revit up to about 8k and drop it in drive if you still have a trans measure the feet of the burnout 100hp per 10ft
(thats a joke dont try that)

Last edited by badknuckles; 12-01-2003 at 08:00 PM.
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