carb cfm question

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Oct 24, 2002 | 04:06 PM

Ford_Six

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From: The Big, Oregon

carb cfm question

Oct 24, 2002 | 06:44 PM

buttnuttn8

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From: bangor maine

carb cfm question

I bought the 351c intake manifold and a 4 barrel carb to make my 351m purr. Well i cant get it to idel slow it revs way up and if i adjust the idel screw it just gets faster so i think its all the way out. so i should prolly get a 600 4 barrel? or what else would make it idel up that fast

let me know please

thanks much

nate

Oct 24, 2002 | 08:41 PM

shazam

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From: Porterfield

carb cfm question

Sounds to me like you got a bad vacume leak..... Check to make sure you hook up the power booster to your brakes to the intake ..and then check all the mating surface with WD-40 or Brake Clean to see if you can trace down the leak...

Oct 25, 2002 | 08:51 AM

buttnuttn8

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From: bangor maine

carb cfm question

Well i hate to say this but i dont know where any of the vacume lines go. I have a large port in the back of the intake manifold and that is pluged into the power breaks but i also have a EGR intake that the damn parts store gave me hte wroung one and now that its bolted on i cant return it so i should plug that right? and im pretty sure my carb has vacume secondaries and all... I bought the 70 hanes book to look up vacume lines and where they go but no good they dont talk even an inch about it except for in the power breaks but htats about it.. it dosnt say where they go or what to do with them. Im thinkin about gettin an old macanic to come over to check it out because i have no clue

oh yeah i dont have a vaume advanced carb either. I do have the 351c intake with plates so maybe i didnt seal that correctly? any more information would be great

thanks

Oct 25, 2002 | 10:11 AM

blu93gt

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From: space city

carb cfm question

what intake do you have on it?

there should be 2 holes where the EGR valve bolds on - one will have exhaust coming out, and the other one will have vacuum from the plenum. if that's not capped off, it would be a big vac leak. you can get a piece of steel, 1-1/4" x 1/8"thick and make a piece to bolt on in place of the egr valve. copper rtv should seal it, or you can get blank sheets of gasket and cut one to fit.

it could also be leaking around the plates, or there could be something else that's not hooked up right. if you don't know what all the vacuum stuff is or what it does, then it's not likely you'll have much luck getting it hooked up right - getting the guy to help might be a good idea.

Oct 25, 2002 | 03:19 PM

buttnuttn8

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From: bangor maine

carb cfm question

I have the Weind X-CELerator but i think maybe a problem is i bought the intake when i was building my hopt up 400 with 351c 4 barrel heads a guys screwed me over so i couldnt build that but intstead found a parts truck and threw that motor in.. its all bone stock 2 barrel heads maybe thats screwing things up? basicly boltin on a 4 barrel intake on a 2 barrel head? all i know is it wont calm down stays reving around 3000 give or take and then when the electric choke comes turns off it stauls out im baffled tried a different carb friend let me borrow his holley 700 double pumper and same thing would start right up but stays at a high idel so im thinkin something is screwed

let me know if any other ideas could be the problem im up for anything

Oct 26, 2002 | 04:26 AM

willd

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carb cfm question

Sounds like you got a huge vacuum leak. Start looking for holes and plugging them. If you dont find it on the outside i'd suggest an internal vacuum leak on the mounting surfaces.