Can I replace two barrel carb with four barrel on chevy 305 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-18-2004, 10:35 PM
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Can I replace two barrel carb with four barrel on chevy 305

New User, Need Help? Have searched the Knowledge Base and FAQ's but after scanning through threads and revising my question have had to resort to begging for advice from the experts. Here's my problem & project. I am begining restoration of a 1979 Chevy El Camino with a stock 305 Two Barrel and auto transmission. Starting with the engine, I would like to build a reliable engine and add just a bit of performance to it as well. After reading messages within the forum l am planning on ordering a master rebuild kit from Northern Auto or PAW. After I measure cylinder bores, crank journals etc. Now to my question, I thought I should try going with a four barrel carb in place of the two barrel, I assume that I will need to replace the manifold. Can anyone confirm this, is it a simple bolt on replacement and is there anything else besides the carb and the manifold that I need to be aware of. Also would appreciate any recommendations on any mild modifications I can do to add a little umph to a stock 305.

Thanks in advance!

maverick19642001

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Old 02-18-2004, 10:39 PM
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that about covers it.
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Old 02-18-2004, 10:44 PM
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Mavrick19642001,
The manifold is a simple swap. Get the correct linkage hardware and you are good to go.
Do you have to worry about smoging this thing?
Here in CA you are not to make ANY changes to engine or exhaust that came with the car from the factory. Now people do and just say "That is the way I bought it" but "the man" could say that because you altered the manifold and carb set-up he will not work on the car. Then you have a BIG mess to clear up.
Now if you can get some smog legal headers to go with that intake setup then you will have something.
Have Fun
Scholman
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Old 02-18-2004, 10:45 PM
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while you've got the intake off, maybe toss in a mild cam. if your worried about the resto part, gmpp makes cams with oe p/n's. but if your wanting too much more than just a few extra ponies, you'll have to swap out the 2bbl haeds. they will not flow enough to support higher hp #'s.
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Old 02-18-2004, 10:58 PM
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A stock iron Qjet intake (pre-EGR if you're not subject to smog tests) & carb would work fine. You may need to change the accelerator cable & maybe the alternator bracket, depending on the year, but it should bolt right in otherwise. A Performer intake would work, but you'd likely lose some bottom-end torque & throttle response, but gain a little bit at high rpm. If you're rebuilding, avoid cheap "rebuild" pistons that are shorter than stock. Flat-topped pistons with the correct height (1.56") cost only a bit more, but the short ones cost power & efficiency, as do the factory-style dished ones. Be sure before you buy the kit. Use a mild cam, not much more than stock, & dual exhausts. Use as thin a head gasket as possible without letting the pistons get closer than .035"-.040" from the heads.
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Old 02-20-2004, 09:31 AM
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Thanks Guys, You have been a lot of help and I'm sure that you have saved me a lot of grief and money.
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Old 02-20-2004, 10:00 AM
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Not to toss a wrench in the gears, but I disagree with "tossing" in a mild cam. First of all, you have to take off all the accessories, the timing cover, chain and oil pan. To do that correctly with the cross-member on most cars you should pull the motor. Furthermore, a cam swap usually makes its most efficient power with better flowing heads and better exhaust. On top of that, a cam swap takes a bit of research as well.

If I had to rate in difficulty from one to ten, one being replacing an air filter and ten being setting up rear end gears or rebuilding a tranny...

Intake swap would be a 3.

Cam swap would be a 6 or 7.

Vastly more work, cost and complication involved. Much more parts matching consideration as well. Stick with the manifold and four barrel for now, do exhaust later and after that, swap a 350, 383 or 400 in with the cam and heads you want. Don't put anything on the 305 that you can't later swap to a larger displacement engine. On that same token I'd use a Weiand stealth intake in leu of the performer edelbrock considering its broader RPM range (ie you could use better heads and a bigger cam on a larger cube engine later and retain the manifold).

K
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