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Old 11-16-2003, 02:00 AM
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Adding some Horsepower to a Chevy 305

Hello I am new to this forum. I have a 1985 1/2 ton chevy p/u 4x4 with a 305 all stock. I was wondering if adding a new carb would make a difference in just a little bit of power. I know 305's arent known for their power, but I was just wondering if anyone could give me some tips on how to beef it up a little. Is there any easy ways to add a little power to it?

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Old 11-16-2003, 07:15 AM
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What I would do is add a few aftermarket items, headers, carb, etc that can be removed and put in the 350 that you are eventually going to put in it, once you get sick of wasting your money on the 305.
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Old 11-16-2003, 08:44 AM
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Just my 2 cent's worth.>< but if you really want to purk up the 305, i would stick simply stick an MSD ignition system on it along with maybe a Mallory HEI distributer,a good set of wire's, a good aftermarket intake, some nice longe tubed header's and some good muffler's. I my oppion a 305 is a damn good engine if well put together, in the past article's i've read about a 305 vs 350's the 305 helled it's own. oh i forgot a set of 1.6 rocker's would let more air into your 305 by given it .030 more lift on your cam, hope this help's.
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Old 11-16-2003, 09:22 AM
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uhh, yeah but you just quoted the guy like 700 dollars worth of parts. Make it easy on yourself, throw a decent four-barrel on there and an edelbrock performer intake, the new eps's are great. You could probably find somebody to sell you a decent four barrel for around 100 bucks or less. You'd be about 200 into the project and have significant gains.
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Old 11-16-2003, 09:58 AM
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Sounds great, I think I will go with a new carb and intake, and eventually get me some headers for it. Thanks for all your information.
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Old 11-16-2003, 11:31 AM
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uhh, yeah bucko $700. in part's, but he dont have to get it all at once now does he?
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Old 11-16-2003, 01:02 PM
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I would just add the edelbrock performer plus package along with a double roller timing chain. the stock chain is usually shot by 40,000 miles, it sure was on the 305 I used to have in a malibu. a set of headers added to it would also be of benefit. these engines came with a low spark timing setting from the factory, so a bump up in advance would be of benefit also, but if the distributor is computer controlled, you`ll have to disconnect the 4 pin plug, set the timing, then disconnect the battery, reconnect the plug, then the battery, and it`s set.
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Old 11-16-2003, 06:31 PM
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no, bowtie, he doesn't but MSD is going to make next to no difference on a 305 with not so much compression. That's basically a waste of 400 dollars that could be better spent on other upgrades. HEI is a great stock ignition that will perform fine for this car. Even if he's worried about it, he could buy the 40 dollar MSD module for HEI ignitions. An ignition upgrade wouldn't even register on this car's time slips, so yeah, its a waste.

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Old 11-16-2003, 10:21 PM
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What if I got a edelbrock intake, and a new carb. What size carb do you guys think would work on a 305, and do well? Would a 800 or 850 cmf be to big?
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Old 11-16-2003, 10:33 PM
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Quote:
Originally posted by Frosty
What if I got a edelbrock intake, and a new carb. What size carb do you guys think would work on a 305, and do well? Would a 800 or 850 cmf be to big?
A 600 CFM would probably be enough. 800 is waay too big.
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Old 11-16-2003, 11:53 PM
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yup, friend ofmine has a new 600 ed with electric choke on a 327 and its a bit too much, we have to jet it down. 600 max my friend.
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Old 11-17-2003, 04:35 AM
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Sell the 305 while its still running good and buy a 350 or bigger, don't waste your money on the 305 you will never be Happy with it if you want some HP! you can feel!
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Old 11-17-2003, 05:01 AM
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roys63 is right all the stuff he´s going to buy might as well be bought for a 350. I made that mistake, kidding myself I was
getting more out of my 305, now I got a 355 I can feel the difference.
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Old 11-17-2003, 07:21 AM
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The chevy 3/4 ton I bought recently was sopposed to be a 350 but low and behold it is only a 305. Not stock of course. before I figured out it wasn't a 350 I got a edel performer intake and a 1406 600 cfm carb and a sealed power ( made by crane) 270 rv cam for it. It runs ok now but still won't spin the tires from a stop. It will get completely crazy though when it hits second at full throttle. The cam likes a little rpm before it comes alive and I ain;t getting a stall converter in something I need to pull trailers with. For here the 600 edel is actualy too big. I need to jet it down now since the plugs are still turning black a little. I already played with the step up springs and all but I have to jet down. Definitly don't go bigger on the carb.
I got a real 4 bolt 350 in the garage that I am building for mine. The 305 and a 34 foot hoorse trailer ain't gonna get along too well. The 350 , I know from experience , will pull it just fine.
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