I have a 350 block, GM zz motor with fastburn heads, lt4 hot cam, 1.6 rockers, holley carb,. TKO 600 Trans, Moser 9'' w/ 3.89 gears and w/ Wilwood Brakes.
Can anyone recomend anything I can do to pick up Horsepower, I am putting 425 at the flywheel and around 405 to the wheels with 469 tq. Are there anyparts I can add such as other engine parts to pull some more power, because I dont want to run a turbo or supercharger.... + dont think I can with my compression ratio... 9.6.1

Thanks

 

What intake and precisely what carb?

 

thats only like 10% loss through drivettrain

 

5% actually, no way.

 

no way in hell a 9.6:1 350 is laying down more power at the wheels than my 11.2:1 385.. just over 5% drivetrain loss is but anyway, you could always throw on a 100shot.. and like five7kid said, what carb and manifold??

 

Jeesh! Chill out people. He took a guess. What's the big deal? Hold the BS signs for a better occasion. Instead of jumping on his case (or bragging about your own car ) it would be better to share some useful information like a rule of thumb for powertrain loss.

It's fairly common to assume a 15% to 20% powertrain loss for a manual transmission. That will give you a better estimate of RWHP. It wouldn't surprise me if you are barely making 350 RWHP or less.

If you are looking to make your car faster without really changing your setup then I would work to optimize the tune of your engine and reduce weight from the car. Reducing weight from the rotating drivetrain gives extra benefit because not only do you lose the weight from the car, but the engine doesn't have to turn as much mass and can accelerate quicker. Some ideas are a light flywheel, driveline, wheels.

But my suggestion is that it is probably time to work on traction. You have quite a bit of power right now. If you can plant the tires to the ground and use that power to move the car then you will be very quick on the street. I would post questions in the suspension section of this board to learn more. Good luck!

 

Holley Carb and Intake Manifold.. and yes the car dynoed at 423 to the crank and 402 to the wheels, with 469lbs of torque. If i had a scanner I would put it on here to show it.... Oh and 5678TA its a 350 block, 385 bored and stroked, Lt4 cam, 1.6 crane rockers.

 

Okay, what Holley carb and what Holley intake manifold?

 

Holley 750-cfm carburetor P/N 12485506
Manifold, Vortec Design Aluminum 12496820
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Its a chevy manifold

 

Ah, GM part numbers. Actually Holley and Edelbrock parts, but understand.

Did you put the engine together, or buy the crate?

That's an idle-5500 RPM intake. Fine for a mild 350, you're beyond that. You need an RPM type intake. There isn't an EGR type available, is that an issue for you?

At what RPMs were your HP and torque peaks on the dyno? You probably won't pick up peak HP, but torque would probably be higher below the peak with a double pumper carb.

You could probably get even higher peak #'s with a single plane intake. But, you'll lose some low RPM torque.

What exactly are you looking to achieve? Drag strip performance? Salt flats performance? Bragging rights?

 

EGR isnt an issue I eliminated it when I swapped engines. I built it. Im looking for drag strip performance but still streetable, ( drive a couple days a week.)

 

That's what I do with the '57. The RPM is much, much better than the "Performer" type manifolds. I picked up better than a tenth with it over an Action+ (Performer equivilent) with the 270 cam I had before. No contest with the 282 cam (closer to the Hot Cam).

Assuming you have adequate traction, you should pick up a good bit with a 750 double pumper (you might want to consider the HP style if no choke is an acceptable situation for you - it is for me) and a Vortec RPM manifold.

A double pumper is really the preferred carb type for a manual transmission, anyway. Don't get that secondary closing delay when you back off of it like you get with VS.

 

i used to run a 650 thunder AVS on my first 383 and i kinda liked it.. when you floored it, it had a little kick when the secondaries opened.. like braaapBRAAAPPP

but i do like the DP style better.. dont have to wait for the power..

 

What makes you so sure....?

 

put a single plane and a go with a bigger cam.

 

A properly set up vac secondary wont do that

 

common sense????

 

well the carb was straight out of the box.. just a little idle mixture tuning.. it was kinda fun.. like a 25hp shot.. haha

 

You have a lot to learn, young Jedi.... things are not always as they seem.

 

Try me i got the dyno sheets, just need a scanner..
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423 hp @ 5400 rpms
469 tq @ 4500 rpms

 

57kid which one would you recomend more
summitracing part #
EDL-2913
or
EDL-71161
I heard that going with a double plane I will lose HP

 

5678TA I still havent seen your engine setup pics, http://www.cardomain.com/ride/2278158

 

The Hot Cam doesn't need anything more than the RPM.

If you go with the Super Victor, you'll probably see slightly more peak HP, but you'd better never operate below 3500 RPMs (under power, that is). I don't have anything directly to back this up, but the HP cross-over between the two manifolds would probably be around 6000 RPMs. Hardly worth it, IMHO, to go with the single plane.

 

kelham, look at my VBGarage.. i have pics.. and a complete list of parts