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Old 04-02-2006, 09:25 PM
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Chevy 350 build-up

Hello everyone,

I'll currently collecting parts to finish this build and I'm stuck on this part. So far, this is what I have.....

1992 350 from a Chevy G-20 van.

bored .30

Pistons: Power Seal H345NP

Rings: Hastings 139

Bearing: Clevite CB-663 P-10

Oil pump: Melling M-55

Timing chain: Cloyes C-3023K

Lifters: Power Seal HT-817

Cam: Clevite 229-1713 (specs from the box)
duration @ .050 int .223 - exh .223
advertised duration int .290 - exh .290
lope spread 114
lash hydraulic
valve lift int .447 - exh .447
cam lift int .298 - exh .298

Gasket set: Felpro KS-2666 260-1269

Vortec heads: 12558060 from Summit

Headman headers: 68600

Vortec Performer Intake....


Now hear is where I have a problem. Based in the intake and cam, which carburetor (size) and torque convertor would you recommend?

Here's the specs on the van. 1988 astro, transmission 700r4, about 4200#, 2.73 rear end, with 235/60-15 tires. Will probably tow about 4000# maybe once a year, if that. I'm looking for good reliability and decent performance. I'll also like to install a nitrous kit (about 75 or 100hp) nothing fancy. It won't be used all the time, just when I'm in the mood to mess around. Also, which kit do you guys recommend?

I've been undecided between Holley and Edelbrock. Some people tell me that Holley will provide good performance but I will have to continuously have to tweek it. On the other hand, I'm told that the Edelbrock carb could be installed and left alone. Could you guys give me some tips?


Thanks......

Jose

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Old 04-03-2006, 06:47 AM
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Any carb you`ll have to tune. Holley carbs work fine.
I`d recommend throwing away the pistons, they are "rebuilder" pistons, they have .020 off the tops, the engine will have about 8:1 compression, and zero quench. from the factory the piston is .025 in the hole, with these pistons it`s .045 in the hole. I`d ran one engine with these pistons in it with a smaller cam and 041 heads, the thing was a slug.
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Old 04-03-2006, 06:49 AM
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Scratch that part, I didn't calculate the 4 valve reliefs into the equation, looks like about 9.5:1 compression.

As far as the carb goes I prefer to run a Holley. Too many people give Holleys a bad rap but I find most of their problems come from their own two hands. From the factory the jetting and other adjustments are generally pretty close. That along with the fact that they don't open the 4 barrels enough to clear out the gas in back bowl which tends to go bad or gel up if not cleared out.

Last edited by engineczar; 04-03-2006 at 06:57 AM.
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Old 04-03-2006, 06:52 AM
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DV where did you see that those are rebuilder pistons? I found them as flat tops.
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Old 04-03-2006, 11:18 AM
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Thanks, what size carb do you guys would work best? Also, what about the torque convertor?

Thanks again....
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Old 04-03-2006, 11:42 AM
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Czar, while they are flat tops, the compression height differs.
A stock 350 from the factory has a compression height of 1.560.
These pistons have a comp height of 1.540.
This isn`t the only style "rebuilder" jobs come in, they also come in dish top designs but the flat top design is more common. You`ll see these pistons all over Ebay at give away prices, also see them in performance magazines, the compression height is never mentioned, and in the rare case that it is, it`s falsified at 1.560.
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Old 04-03-2006, 07:10 PM
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Some guys have recommended that I go with a holley 750, other are telling me barry grant 650.. even edelbrock 600... I don't know what the pro's and con's are on each......

Since I have no experience tuning, working or adjusting a carb, which one would you guys recommend for a rookie?

Thanks
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Old 04-04-2006, 03:25 AM
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demon carb
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Old 04-04-2006, 04:01 AM
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The easiest carb to tune that will run right out of the box will be an edlebrock 600 with an electric choke PN 1406. Tuning will be very easy and may not be necessary given your combination. The holleys & Demons are good but require more out of the box to get the setup right.
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Old 04-04-2006, 12:37 PM
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Will the edelbrock 600 be large enough or should I try something larger?....
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Old 04-04-2006, 09:43 PM
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bump......................
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Old 04-06-2006, 09:53 PM
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For this setup, which Holley would you recommend 600 or 650? Which model number?

Could someone tell me how much power this setup will produce on a desktop dyno?

On more thing, I'm now sure if this cam, intake and carb combination is a good match. I'm also trying to research the rpm range on the cam. This cam was selected by the machine shop, they tell me it should perform well with the setup. What do you guys think?

Thanks again....
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Old 04-07-2006, 05:17 PM
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So, what do you think?.......................
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Old 04-07-2006, 07:32 PM
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a 600-650 should be fine. brand is your choice. The 350 I had was a 600 holley vac secondarys and it feed plenty of fuel to my fairly stock engine.
Stock stall would probably be fine.
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Old 04-07-2006, 08:06 PM
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Quote:
Originally Posted by engineczar
That along with the fact that they don't open the 4 barrels enough to clear out the gas in back bowl which tends to go bad or gel up if not cleared out.
I have never had that problem.

Last edited by Jake_Dragon; 04-09-2006 at 07:53 AM.
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