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  #16 (permalink)  
Old 04-21-2013, 08:32 AM
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I agree with f-bird,a 4779 holley or HP series or,,,if you can build the carb yourself? I really like using a 4777 holley as is except,,change the base plate to a base plate off a 4781(850). Build that carb,it will flow785 ish.The throttle response is excellent,small venturi Vs 850 Base
plate. If you modify the 650 add replace able air bleeds

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Old 04-21-2013, 10:33 AM
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Find the right proform 750 HP double pumper carb body kit.
There is 60 to 100hp in trashing thise ehads. It will even drive better.
Those heads will severly limit the performance of this engine in all reguards.
Get better modern heads.

The main jets that come in the 750 HP carb body kit are usually dead on.
The air bleeds are a start point. Use the primary and sec idle air bleed sizes from the DONOR carb body
that the DONOR metering blocks came from as your default base line.
Custom tuning the air bleeds gets it EFI sharp. Way better than any carb you can buy.

First: on your 600VS carb, try a 67primary jet. Get the sec metering plate #21 from a old 3310 carb
use a 6.5 power valve and a purple spring in the secondaries.

The sec metering plate can be modified to accept standard holley main jets too.
use a .025 or .028 or .031" accel shooter and play with the shooter cams.

With the crab low hp heads there is not much to be gained with a 750 over the carb you got now.
But once you replace those crap heads a 750 carb will show a gain.

Last edited by F-BIRD'88; 04-21-2013 at 10:42 AM.
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Old 04-21-2013, 11:19 AM
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I would upgrade the cylinder heads before the carb. The 600 will become a whole different carb
with decent cylinder heads. Ya they are THAT BAD.
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Old 04-21-2013, 12:03 PM
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F-bird,

Its so bad right now I am thinking that I have some other issue.. It feels like 100hp right now. Im going to start with the fuel filter and see where that gets me, and then pull the plugs to see what it looks like.

Again, when I had fuel injection it felt amazing.. Like I could break the tires loose at 50mph by just stomping on it.
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Old 04-21-2013, 12:25 PM
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I trust you re not trying to use the EFI pump on a carbed motor....right....

Why are you paying for expensive dyno tuning with a crap 200hp cylinder head on this motor.
Just fix and tune the carb your self. They are not rocket science. probabily a ignition issue.
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Old 04-21-2013, 01:28 PM
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Nope carb pump.

I was trying to dial the engine in after I had done the major tuning myself. Didnt do much..
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Old 04-21-2013, 01:40 PM
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dyno

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Originally Posted by Andyrew View Post
Nope carb pump.

I was trying to dial the engine in after I had done the major tuning myself. Didnt do much..
what he is saying is;even if you find a few ponies the cost is too high for such a low return. Your 914 is the second v-8 Ive seen. what amount of power will your trans axle accept?
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Old 04-21-2013, 02:23 PM
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8 years running just fine. CV joints fail but only been 3 so far.

It wasnt the extra ponies I was after, it was drivability and perfect idle that I wanted.
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Old 04-21-2013, 04:01 PM
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Quote:
Originally Posted by Andyrew View Post
8 years running just fine. CV joints fail but only been 3 so far.

It wasnt the extra ponies I was after, it was drivability and perfect idle that I wanted.
If extra ponies isn't needed or wanted why don't you eBay yourself a factory GM TPI set up? Cheap, and makes lots of low end and is very drive able.
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Old 04-23-2013, 06:17 AM
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Go back to efi. You'll never get the consistent performance efi can give from a carb. Carbs are great for track cars but they require continuous fiddling.

Plus the cost is about the same or less.


Then I'd change the cam to something like a voodoo 262. Maybe even the 256. They're both plenty big for your combo and will give you a lot more mid range power.

Heads would be nice too but may be too expensive. People often forget that talk is cheap but parts aren't. No offense but your car doesn't look like a high dollar combo. Upgrading to some good used heads may be an option though so watch Craigslist. A mildly ported and milled set of double hump heads would fit what you already have and can be found rebuilt for 300 or less if you keep an eye out.

Those small changes will all add up to a much stronger mid range with minimal cost.

For the ecu I like mega squirt but other options are available.
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Old 04-23-2013, 03:21 PM
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Carbs are great for track cars but they require continuous fiddling.

This is not true at all. Once the carb is set up you do not need to touch it.
I never touch mine.

You just have to know how.
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