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Author Topic:   carb ?
Dirt Maniac

Total posts: 156
posted March 04, 2002 03:19 PM
what do u guys do to your rodchester 2bbrls for performance gains? I dont have any trouble with mine my friend is real good with them. Just wondering what the other guys do to theirs, and if anybody has bought one of those speedway carbs,howed they work? just worndering thanks

Dirt Freak

Total posts: 330
posted March 04, 2002 09:09 PM
trade em in for Holley's

Smith Racing Team

Dirt Forum Champ
Total posts: 1565
posted March 05, 2002 01:02 AM UIN: 54865418
scoot some of us have no choice in the matter i have a speedway one i bought this winter i;ll let you know what i think here in about 3 weeks

Dirt Forum Racer

Total posts: 79
posted March 05, 2002 05:18 AM
Cut a 1/4" off of the plastic fuel baffle and smooth the cut with some 250 grit sandpaper laying on a flat surface. This will get you more space in the bowl for fuel. Your float may be adjusted so that it allows a little more fuel in the bowl than the stock setting.

Cut no more than 1/8" off of the top of the accellerator pump rod so that it will ride higher in the well. Polish the tip with increasingly finer grades of sand paper and emery cloth. Buff it if you have the tools.

Get jets that are no more than 2 or 3 thousandths larger. If you go higher than this, you will probably have to get larger metering rods which are hard to find.

Don't go overboard with a too radical cam so that your vacuum will not be affected. If you must do this you will need a weaker power piston spring.

Dirt Freak

Total posts: 408
posted March 05, 2002 06:54 AM
There are MANY mods that can be done to the TWO barrell Rochesters (similar to the quadrajet mods stated above).
Power restriction changes, power valve spring tension changes, fuel well enlargement, air bleed changes, booster assembly improvements (where rules allow, since this is very visable from the exterior), and of course, conversion to allow the use of Holley jets, are just a few of the modifications you may find in a custom built 2G. FWIW, from our experience with these carbs, the Speedway carbs, or other such mass-produced carbs will not have many (if any) modifications outside of a larger needle and seat and perhaps Holley jets.
This was the original intent of my reply in the other thread about the 2G carbs, and I apologize for coming off like a sales pitch.....not my intent at all.

Additionally, I think it should be known that the Kinetic Performance "outlaw style" 2G carbs have much larger butterflies, and venturi diameters than even the large bore 2G carb (aka the "school bus" carb). We run 1.75" hi flow machined butterflies, and a 1.437" offset bore venturi, in addition to many other improvements, making this carb flow more than most any other 2G out there.

Just some info for ya...hope it helps.


Dirt Forum Racer

Total posts: 79
posted March 06, 2002 04:28 AM
KP... why did you think that this applys to quadrajets only? What I stated can be applied to the primaries of the quadrajet. Is there something that I'm missing?

[This message has been edited by Machinah (edited March 06, 2002).]

Dirt Forum Racer

Total posts: 79
posted March 06, 2002 04:32 AM
By the way... I was not refering to the 2G which I have not had, but have seen the exploded views. They are very hard to find used here, but can be bought reconditioned from our parts stores. Aren't they a bit different? I know that they are the carb to have with these rule restrictions.

[This message has been edited by Machinah (edited March 06, 2002).]

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