recommend carburetor for stock 302 - Team Camaro Tech
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post #1 of 12 (permalink) Old Sep 16th, 04, 11:20 PM Thread Starter
 
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Hello all,
I'm looking to swap my original 780 Holley carb on my 302. My 302 engine is all stock. I have 3.73 gears and a M22 trans. The 780 runs pretty good especially up top but I rarely buzz my engine up that far. I would like to put a carb that has better throttle response down low. Should I just rebuild and re-jet the 780 or get a smaller carb like a 600 vac holley or a 650 DP? I think I have 70/76 jets in the old carb now.
Thanks
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post #2 of 12 (permalink) Old Sep 17th, 04, 03:37 AM
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650 DP will work just fine


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post #3 of 12 (permalink) Old Sep 17th, 04, 04:52 AM
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I don't think swapping carbs is going to change the low end very much at all. Swapping to a smaller cam and a tranny with a lower first ear would make a more significant change.

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post #4 of 12 (permalink) Old Sep 17th, 04, 06:28 AM
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I think your rear end/M-22 are fine. I would go with the Speed Demon 650 mechanical secondary, and a four hole, torque plate as spacer, like this:

http://www.jegs.com/cgi-bin/ncommerc...32&prmenbr=361

I think you will be happy with this combo, and will give you more performance for you dollar if you ARE thinking about a new carb. If you still aren't happy with the torque vs. hp of the 302 engine at the usual rpm levels, then a dual plane intake manifold with as long runners as you can find would be a logical choice... .

67 Camaro | 350 | 650 Speed Demon | Dual plane GMPP intake | MSD ignition | Secret Cam (I don't know what it IS!) | 2.02/1.60 Camel Humps ported | Thorley Tri-Y's | 8.5 10 bolt 3.73 | M22
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post #5 of 12 (permalink) Old Sep 17th, 04, 08:35 AM
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JohnZ runs a smaller carb on his DZ302. I believe I read that in a recent post. Go to the Directory (upper right of most forum pages) do a search on JohnZ or John Z and then click on his recent posts or send him a PM...

...Dennis

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post #6 of 12 (permalink) Old Sep 17th, 04, 09:35 AM
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If you go to a Demon carb remember they are wet flowed and are rated much more conservatively than a Holley (a 650 Demon is bigger than 650cfm).

It is hard to beat the throttle response of a O-3310 vac secondary carb by going to a double pumper. Low end throttle response is generally a little weak with a 302 because of the short stroke, not because of the carb.

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post #7 of 12 (permalink) Old Sep 17th, 04, 10:13 AM
 
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Put a good old 600 cfm, vacuum secondary, 1850 Holley on it and see???

But I will say this!! Crane lists the "STOCK" re-pop, 30-30 cam they sell as having a power range from 4,000 to 6,800 rpm so no matter what you do to the little motor, it's not going to help it's low end much, imho, unless you change cams..

AND I would strongly recommend a good old stock, "Little-Bitty" Duntov, -097 solid cam with a set of 1.6 ratio rockers on it OR a good old CC 270S solid...

And the intake already on it is just about the best stock, high-rise dual plane there is!! Again, imho....

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post #8 of 12 (permalink) Old Sep 17th, 04, 02:34 PM
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A 2818 600cfm would work well and even be calibrated correctly (it's the old 365HP 327 carb which is basicly your motor with 1/4in stroke.
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post #9 of 12 (permalink) Old Sep 17th, 04, 03:16 PM
 
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Oger's right, the 350hp/327 only used a 585 cfm carb. so the 365hp/327 carb. at 600 would do very well too, imho..

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post #10 of 12 (permalink) Old Sep 17th, 04, 03:42 PM Thread Starter
 
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Thanks for the input. I got in touch with John Z and he ran a 600 vac too. Sounds like I might try the same. I know the lil 302 doesn't have much grunt down low but anything to make the throttle response a little more civilized in cruise mode. Appreciate all the info guys! [img]graemlins/beers.gif[/img]
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post #11 of 12 (permalink) Old Sep 17th, 04, 10:56 PM
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put a q-jet on it with a regular performer manifold. i bet that would help the low end a bit and still make good power up high when you want it to.

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post #12 of 12 (permalink) Old Sep 18th, 04, 04:43 AM
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I run a 650 DP. It runs pretty well that way.

I have a wideband O2 sensor on my xmas list so maybe it will run even better after that.

-Mark.
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