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Author Topic:   rochester 2 barrel
posted June 29, 2003 12:40 PM
A friend got teched on his Rochester 2 bbl carb and the tech inspector stuck his finger in the carb and then told him it wasnt IMCA legal. the tech guy tried to explain what he checked but the freind had no clue what he was talking about, he asked me and I asked if he stuck a gauge in it to check it and he said no, he was told not to come back with it what could he have checked with just his finger ? Thanks , Jim

posted June 29, 2003 12:51 PM
there is a little casting ridge on them and you can't take it off thats probably what it was i have one of the speedway ones and tho it passes the gauges i can't run imca because it's pollished and that casting line is gone

posted June 29, 2003 12:53 PM
Thanks 17, I hadnt a clew either what he had done,I also have a carb from Speedway, Iam on my way out to check it now. Thanks again ! Jim

posted June 29, 2003 09:47 PM
Just a thought here, but before you guys all throw out those worked-over 2bbls, Kinetic Performance can add a casting line back into the venturi area so that tech men won't fail you with their "hi tech" finger test....

Don't laugh, it's been done more than you think.. :-)


posted June 30, 2003 08:55 PM
I may be sending the carb off to K-P to have this casting ridge added back on, depends on the cost. Thanks all ! Jim

posted June 30, 2003 09:31 PM
As a track IMCA official I can tell you that just adding the ridge back in won't pass most places. A simple look down in the carb can tell if the original casting line is still there. The Speedway carb venturi is bored with a flat vanturi about 1/2 inch long in the carb. Really easy to spot.

Most carb builders bore down from the top and then up from the bottom to put a small ridge back in. Still easy to spot. I usually make them take the carb off if I'm not sure. It's easy to spot from the bottom.

It's all not worth it if you ask me. Do the leg work and find a big bore carb to start with.

Good luck,

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posted July 01, 2003 12:53 AM
came on school busses and get your wallet out them suckers aint cheap now that the secret is out

posted July 03, 2003 07:46 AM
A lot of the old chevy trucks have them. Grain trucks and dump trucks. Usually have a govenor on them, so the're easy to spot. Our tech guys just look into the venturi with a flashlite and can see any grinding.

rico 08
posted July 03, 2003 08:21 AM
I've got a stock big two barrell(not truck)egr intake i will sell.

posted July 03, 2003 03:14 PM
My best setup yet included a 2 barrelintake off of an old chevy grain truck. The center is raised a bit more, and it seems to keep the carb cooler. My old stock carb loves it.

posted July 06, 2003 05:38 PM
stock replacement at advance auto 149.00 500cfm part no 3710

posted July 07, 2003 07:32 PM
hey guys
the intake of a school bus the one with CANADA cast into the top of it is about 1 1/2 inches higher and flows real good also the 400 ci 2 bbl off a 70-72 impala is a great carb with the bus intake
good luck on the scavange hunt

Big Bear
posted July 07, 2003 08:40 PM
Is that Canadian intake Cast Iron or aluminum. Is it for a small block?

Thanks in advance
Brakes are for the weak at heart
Big Bear

posted July 08, 2003 06:09 AM
Thanks hs gonna keep my eye out for one now

Big Bear

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